CN106362795A - Method of improving reaction performance in preparation of higher alcohols (C<6+> alcohol) through synthetic gas one-step method by means of bifunctional catalyst combination system - Google Patents

Method of improving reaction performance in preparation of higher alcohols (C<6+> alcohol) through synthetic gas one-step method by means of bifunctional catalyst combination system Download PDF

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CN106362795A
CN106362795A CN201610728588.1A CN201610728588A CN106362795A CN 106362795 A CN106362795 A CN 106362795A CN 201610728588 A CN201610728588 A CN 201610728588A CN 106362795 A CN106362795 A CN 106362795A
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catalyst
reaction
higher alcohols
alcohol
combined system
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CN106362795B (en
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陈新德
郭海军
张海荣
齐高相
彭芬
王璨
熊莲
陈雪芳
黄超
林晓清
黎海龙
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Xuyi Attapulgite Research & Development Center Of Guangzhou Institute Of Energy Conversion Chinese Academy Of Sciences
Guangzhou Institute of Energy Conversion of CAS
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Xuyi Attapulgite Research & Development Center Of Guangzhou Institute Of Energy Conversion Chinese Academy Of Sciences
Guangzhou Institute of Energy Conversion of CAS
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002Mixed oxides other than spinels, e.g. perovskite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/83Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/06Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/19Catalysts containing parts with different compositions
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C07C29/153Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the catalyst used
    • C07C29/156Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the catalyst used containing iron group metals, platinum group metals or compounds thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2231/00Catalytic reactions performed with catalysts classified in B01J31/00
    • B01J2231/60Reduction reactions, e.g. hydrogenation
    • B01J2231/62Reductions in general of inorganic substrates, e.g. formal hydrogenation, e.g. of N2

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Abstract

The invention relates to a method of improving reaction performance in preparation of higher alcohols (C<6+> alcohol) through a synthetic gas one-step method by means of a bifunctional catalyst combination system. The bifunctional catalyst combination system includes a catalyst A and a catalyst B, wherein the catalyst A is a Cu-Fe-Co based catalyst supported by a polymer/mesoporous silicon composite material, and the catalyst B is a Cu-Zn-Fe based catalyst supported by an acid-modified attapulgite/cerium-zirconium solid solution composite material. The bifunctional catalyst combination system is packed in a two-stage reaction zone in the material feeding direction according to the sequence of A//B or B//A in an upper-lower layer manner, or is packed in a three-stage reaction zone in the material feeding direction according to the sequence of A//B or B//A in an equal-volume multi-layer manner. The bifunctional catalyst combination system has mild reaction conditions, simple preparation process and convenient operations, and can be used for producing the higher alcohols from the raw materials such as coal, biomass, natural gas and the like through the synthetic gas one-step method. The method has excellent industrialization application prospect.

Description

A kind of bifunctional catalyst combined system is used for improving one-step method from syngas prepares high-carbon Alcohol (c6+Alcohol) reactivity worth method
Technical field
The invention belongs to bifunctional catalyst combined system technical field is and in particular to a kind of bifunctional catalyst assembly It is to prepare higher alcohols (c for improving one-step method from syngas6+Alcohol) reactivity worth method.
Background technology
Preparing MAS for raw material through synthesis gas circuit line using coal, biomass and natural gas has become c1Chemical multiphase One of main research of catalytic field.The catalyst system being adopted mainly has modified methanol synthetic catalyst, modified expense Support (f-t) synthetic catalyst, rh base catalyst and modified mo base catalyst (sulfide and oxide) etc., product is mainly low-carbon (LC) Alcohol.In conventional fixed bed reactors, low-carbon alcohols selectivity and yield all relatively low it is difficult to meet industrialization demand.For this reason, being directed to C in higher alcohols synthesis1→c2With difference and the thermodynamics feature of subsequent step reaction rate, passed through suitable using double sections of bed reactors When bed combination can obtain preferably co conversion ratio and c2+The selectivity of alcohol.Beretta etc. synthesis isobutanol during, Using cs-cu/zno/cr2o3‖cs-zno/cr2o3Dual bed catalytic agent obtains compared with monolayer bed cs-cu/zno/cr2o3Catalyst Higher isobutanol yield, the reaction temperature of two kinds of beds be respectively 325 DEG C and 405 DEG C [j.chem.soc., chem.commun.1995,2525-2526】.United States Patent (USP) us 5096688 discloses one kind by overlying catalyst coo-maox- zno-mbox(maFor ti, al, mn, mg, mbFor alkali metal li, na, k, rb, cs) and the conjunction of lower-layer modified low-temp low-pressure cu base methanol Become double section bed reactors of catalyst combination loading, synthesis gas is converted into first in 232~343 DEG C under overlying catalyst effect Alcohol, c2+Alcohol, the unsaturated organic oxygen-containing compound (as carboxylic acid, aldehyde, ketone, ester) containing 2 or more c atom, water and hydro carbons by-product Thing, the unsaturated oxygenatedchemicalss in this mix products so that lower catalyst agent effect under by hydrogenation formed alcohols, water is then It is eliminated by water gas shift reaction, promote c2+Alcohol selectivity and the raising of low-carbon alcohols purity.
Compared with low-carbon alcohols, higher alcohols (c6+Alcohol) there is higher carbon number and added value.Generally c6~c10Alcohol claims For plasticizer alcohol, c12+Alcohol is referred to as detergent alcohol, and they are synthetic surfactant, detergent, plasticizer and other are multiple fine Chemical products want raw material.External high-carbon alcohol production started from for 18th century, was mainly produced by animal oil.The development of 19 beginnings of the century N-alkane oxidizing process produces higher alcohols.The forties in 20th century, Germany is succeeded with oxo process legal system higher alcohols.1961 The U.S. develops Ziegler legal system alcohol variation route.Higher alcohols mainly crack gained alkene with non-renewable petroleum resources at present is former Material, the carbongl group synthesis reaction through rh base or co base catalyst produces, but technique is typically more complicated.China had started in the sixties The production of small-scale.The eighties, the domestic high-carbon alcohol production built up with natural oil, synthetic fatty acid, alkene as raw material Device, and progressively developed with ethylene and paraffin for the method for Material synthesis higher alcohols.However, China's higher alcohols industrial foundation is thin Weak, backward in technique, yield poorly, and the huge market demand leads to import volume to increase year by year, this imbalance between supply and demand seriously constrains down The development of trip related industry.
In recent years, the concern that higher alcohols gradually cause Chinese scholars is directly prepared by synthesis gas, the catalysis being adopted Agent system mainly have Chinese patent cn 102266790a, cn 102266778b, cn 101310856b, cn 103586060b and Co base catalyst disclosed in United States Patent (USP) us 7670985, Chinese patent cn 102319575b, cn 103433046a, cn Cu-fe, cu-co and cu-co-fe base catalyst disclosed in 102500374b, cn 105085185a.Additionally, some have special The catalyst of structure, such as three-dimensional ordered macroporous cu-fe base catalyst (chemcatchem, 2014,6 (2): 473-478), Cocumn ternary metal nuclear shell structure nano catalyst (journal of the american chemical society, 2013,135 (19): 7114-7117) and cu@(cuco-alloy)/al2o3Nuclear shell structure nano catalyst (green Chemistry, 2015,17 (3): 1525-1534) also applied.Polymer/mesoporous silicon composite loads cu-fe-co Base catalyst also has good synthesis gas and prepares higher alcohols performance, and reaction condition is gentle, and method for preparing catalyst is simple and property Can be stable, but also exist that alcohol selectivity is relatively low, the higher problem of other by-product selectivitys.
From thermodynamic analysis, exothermic reaction is belonged to by the reaction that synthesis gas directly prepares mixed alcohol, temperature is more low more favourable In the synthesis of alcohol, but low temperature is unfavorable for the conversion of co, and co2Selectivity is higher, and the timely transfer of reaction heat is catalyzed for maintaining Agent activity is most important;Reverse water-gas-shift reaction belongs to the endothermic reaction, and temperature is more high more is conducive to co2Conversion and alcohol carbon Chain increases, but high temperature is unfavorable for the synthesis of alcohol, and is also easy to produce the by-products such as hydro carbons.In addition to reaction heat, each product (inclusion water) phase The impact of heating is also very big.Therefore, the impact to selectivity of product for the selection of reaction temperature is larger.Using mixing alcohol synthesis reaction Coupling effect and reverse water-gas-shift reaction between, transfer and byproduct of reaction convert in time in time to make reaction heat, can be effective Adjust catalyst activity and selectivity of product, and improve catalyst stability.Patent cn 103613483b, is loaded by upper strata Cu-fe-co base modification f-t synthetic catalyst cuafebcocmd/sio2Cu/zno/al with lower floor's filling2o3/mxoyModified first The combination of alcohol synthetic catalyst, makes synthesis gas be converted into co in the presence of overlying catalyst2, water, methanol, c2+Alcohol, other not The complete synthesis gas of saturation organic oxygen-containing compound (as carboxylic acid, aldehyde, ketone, ester) and hydro carbons by-product, products therefrom and unreacted enters Enter lower catalyst agent, part co therein2Pass through hydrogenation with unsaturated oxygenatedchemicalss and form alcohols, water is then become by water gas Change reaction to be eliminated, thus promoting the conversion of higher alcohols synthesis byproduct in process thing, effectively increase reactivity and The yield of low-carbon alcohols and selectivity.But this layering loading catalyst is mainly for the preparation of c1~c5Low-carbon alcohols.Up to the present, Bifunctional catalyst combined system be applied to one-step method from syngas prepare in the reaction system of higher alcohols have not been reported.
Content of the invention
It is an object of the invention to provide a kind of bifunctional catalyst combined system is used for improving one-step method from syngas preparation Higher alcohols (c6+Alcohol) reactivity worth method, this bifunctional catalyst combined system achieves the timely of reaction heat in course of reaction Transfer and the timely conversion of byproduct of reaction, make the industrial prospect that one-step method from syngas prepares higher alcohols get a promotion.
In order to realize foregoing invention purpose, technical scheme is as follows:
It is an object of the invention to provide a kind of bifunctional catalyst combined system is used for improving one-step method from syngas preparation height Carbon alcohol (c6+Alcohol) reactivity worth method, raw material of synthetic gas is introduced fixed bed hydrogenation reactor, by bifunctional catalyst group Zoarium system bed, reaction under the conditions of thermal coupling generates higher alcohols;
Described bifunctional catalyst combined system bed is made up of catalyst a and catalyst b, and described catalyst a is polymerization Thing/mesoporous silicon composite loads cu-fe-co base catalyst, and described catalyst b is sour attapulgite modified/cerium zirconium sosoloid Composite loads cu-zn-fe base catalyst;
Described fixed bed hydrogenation reactor comprises more than two sections of reaction zone, the bifunctional catalyst group in two-stage reaction area The order levels filling of a//b or b//a, the double-function catalyzing in more than three sections reaction zones are pressed along feed stream direction by fit system Agent combined system presses the order equal volume multilamellar filling of a//b or b//a along feed stream direction;
The admission space of described catalyst a and described catalyst b is than for 1/9~9/1.
Catalyst a mainly provides the c-o that synthesis gas is prepared needed for higher alcohols to insert into alcohol and c-c chain growth active sites, urges Agent b mainly provides by-product co2Active sites needed for conversion, realize effective modulation of h/c ratio in synthesis gas, provide by-product simultaneously In thing, aldehyde, ketone, acid are hydrogenated into active sites needed for alcohol, and to improve higher alcohols selectivity, this bifunctional catalyst combined system is realized The timely transfer of reaction heat and the timely conversion of byproduct of reaction in course of reaction, improve polymer/mesoporous silicon composite wood The reactivity of material load cu-fe-co base catalyst and higher alcohols selectivity.
The polymer that catalyst a is prepared for emulsion polymerization in situ/mesoporous silicon composite (pm/ms) loads cu-fe-co Base catalyst, catalyst b be coprecipitation or sol-gel process or solution combustion method preparation acid attapulgite modified/cerium Zirconium solid solution composite (atp-czo) loads cu-zn-fe base catalyst.Two kinds of catalyst granules are 20-100 mesh, preferably 60-80 mesh, and uniformly mix with isopyknic 40-60 mesh quartz sand respectively, by silica wool by bifunctional catalyst separately.
Preferably, the expression formula of described catalyst a is cua1feb1coc1m1d1/ pm-ms, wherein m1 are selected from la, zr or k More than one, a1, b1, c1 and d1 are respectively cu, fe, co and m1 and account for the mass fraction of catalyst, and a1=10~30%, b1 =10~30%, c1=1~10%, d1=1~5%;Described polymer pm is by monomer methyl acrylate or methyl methacrylate Polymerization is formed for ester or both mixing (mixing quality than for 1/4~4/1), and is expressed as pma or pmma or pmma&pma; Described mesoporous silicon ms divides selected from mcm-41 molecular sieve, mcm-48 molecular sieve, mcm-50 molecular sieve, sba-15 molecular sieve, sba-16 One of sub- sieve, msu-j molecular sieve, msu-h molecular sieve or hexagonal mesoporous silicon or two kinds;Described mesoporous silicon and described polymer The mass ratio of monomer is 0.005~0.4.
The preparation method of catalyst a, comprises the steps:
(1) in terms of mass fraction, successively by 40~80 parts of polymer monomers, 0.1~0.5 part of initiator, 0.4~16 part of Jie Hole silicon, 0.1~0.5 part of buffer agent, 60~120 parts of water, 0.2~1.0 portion of anion surfactant and 0.2~1.0 part of emulsifying Agent is added in reaction vessel, at room temperature after ultrasonic wave concussion 20~60min, polyreaction occurs in 60~80 DEG C of water-baths 2~5h, is cooled to less than 50 DEG C, filters, and collects condensation product, the emulsion mass fraction obtaining is 5~30% demulsifier water Solution breakdown of emulsion obtains solid product, rinses and dries, pulverized 100 mesh standard sieves obtain the carrier polymer of described catalyst a/ Mesoporous silicon composite;
(2) by active component cu, fe, the nitrate of co or acetate or oxalates or citrate and auxiliary agent la, The chloride of at least one of zr, k or nitrate or acetate or oxalates are configured to metal ion total concentration together and are The mixed aqueous solution of 0.5~5.0mol/l, or contain less than 30% ethanol or the mixed aqueous solution of ethylene glycol and above-mentioned substance, to Wherein add carrier polymer/mesoporous silicon composite powder, and dipping 2~12h is stirred at room temperature, then dry, pulverize After put in Muffle furnace, in 300~600 DEG C of roasting 2~8h, that is, polymer/mesoporous silicon load cu-fe-co base catalyst is obtained;
Described polymer monomer is that (mixing quality ratio is for 1/ for acrylic acid methyl ester. or methyl methacrylate or both mixing 4~4/1);
Described initiator is selected from Ammonium persulfate., potassium peroxydisulfate, sodium peroxydisulfate, azodiisobutyronitrile or dibenzoyl peroxide One of;
Described mesoporous silicon ms be selected from mcm-41 molecular sieve, mcm-48 molecular sieve, mcm-50 molecular sieve, sba-15 molecular sieve, The mixing of one of sba-16 molecular sieve, msu-j molecular sieve, msu-h molecular sieve or hexagonal mesoporous silicon (hms) or two kinds is (mixed Closing mass ratio is 1/4~4/1);
Preferably, described mesoporous silicon ms is selected from mcm-41 molecular sieve, sba-15 molecular sieve or hexagonal mesoporous silicon (hms) One or two mixing (mixing quality than for 1/4~4/1), wherein mcm-41 is prepared with reference to United States Patent (USP) us 5102643, Sba-15 is prepared with reference to Chinese patent zl 01126509.4, and hms reference literature (Chen Junhua. the synthesis of hexagonal mesoporous silicon hms, change Property and performance study [d]. Nanjing: Nanjing Forestry University, 2009) preparation;
Described buffer agent is selected from one of sodium bicarbonate, potassium bicarbonate or ammonium hydrogen carbonate;
Described anion surfactant is selected from dodecyl sodium sulfate, dodecylbenzene sodium sulfonate, lauryl sulphate acid One of ammonium, Brij 35 sodium sulfate or sodium lauryl sulphate;
Described emulsifying agent is selected from alkylphenol polyoxyethylene, fatty alcohol-polyoxyethylene ether or polyoxyethylene carboxylate A kind of;
Described demulsifier is selected from one of sodium chloride, calcium chloride, aluminum chloride, iron chloride or aluminum sulfate.
Preferably, the expression formula of described catalyst b is cua2znb2fec2m2d2/ pal-czo, wherein m2 be selected from co, mn, rh, One or more of k, mol ratio a2/b2/c2/d2 of cu, zn, fe and m2 be 1/ (0.5~1)/(0.05~1)/(0.01~ 0.3) mass fraction that, carrier pal-czo accounts for described catalyst b is 20~75%.
The preparation method of catalyst b, comprises the steps:
(1) attapulgite modified by Pressure hydrometallurgical process preparation acid
By the solid mass ratio 3~8:1 of liquid, by concentration be 4~20% sulfuric acid solution and attapulgite mixing, mix homogeneously Afterwards, closed reaction vessel, is warming up to 100~150 DEG C of constant temperature stirring reaction 0.5~3h, terminates rear blowing, quiet heavy rear upper strata slurry Filtered, Cake Wash, to neutral, is dried, the acquisition acid that pulverizes and sieves is attapulgite modified;
(2) by coprecipitation or sol-gel process or solution combustion method preparation pal-czo carrier
During coprecipitation preparation pal-czo carrier, cerium salt, zirconates and sour modified attapulgite powder end are dissolved in the water, Ultrasonic disperse 1~5h obtains mixed solution while stirring, carries out in being simultaneously added dropwise respectively to container with ammonia at 25~80 DEG C Co-precipitation, maintains reaction system ph=8.0~10.0, after being added dropwise to complete, continues at the same temperature to stir aging 1~5h, mistake Filter, washing precipitate to neutral, dry by filter cake, and in 400~800 DEG C of roasting 3~7h, pulverizes and sieves acquisition attapulgite/cerium Zirconium solid solution composite;
During sol-gel process preparation pal-czo carrier, cerium salt, zirconates are dissolved in the water, add ethanol and citric acid, Magnetic agitation 1~5h forms colloidal sol, is proportionally added into sour modified attapulgite powder end, continues magnetic agitation 1 in gained colloidal sol ~5h, solvent evaporated in 60~90 DEG C of water-baths, gained gel is dried in an oven, and in 400~800 DEG C of roasting 3~7h, powder The broken acquisition attapulgite/cerium zirconium sosoloid composite that sieves;
During solution combustion method preparation pal-czo carrier, cerium salt, zirconates are dissolved in the water, add ethylene glycol to stir, Add sour modified attapulgite powder end, ultrasonic disperse 1~5h while stirring in resulting solution, resulting solution is placed directly within Muffle With 1.0~5.0 DEG C/min ramp to 400~800 DEG C of roasting 3~7h in stove, the acquisition attapulgite/cerium zirconium that pulverizes and sieves is solid Solution composite;
(3) by infusion process preparation pal-czo load cu-zn-fe base catalyst, will active component cu, zn, fe and auxiliary agent The nitrate of at least one of co, mn, rh, k or acetate or oxalates or citrate are configured to metal ion total concentration Mixed aqueous solution for 0.5~5.0mol/l, is added thereto to attapulgite/cerium zirconium sosoloid composite powder and in room temperature Lower stirring dipping 3~24h, then dries, puts in Muffle furnace after pulverizing, in 300~500 DEG C of roasting 2~6h;
Above-mentioned cerium salt is selected from cerous nitrate or ammonium ceric nitrate, and zirconates is selected from zirconium nitrate, zirconyl nitrate or zirconium oxychloride Kind;
The ethanol adding in above-mentioned sol-gel process preparation process is 0.5~4:1 with the mass ratio of aqueous solvent, interpolation Citric acid molal quantity is 1~2:1 with the ratio of cerium, the molal quantity sum of zirconium ion;
The ethylene glycol adding in above-mentioned solution combustion method preparation process is 0.5~2:1 with the volume ratio of aqueous solvent;
In above-mentioned attapulgite/cerium zirconium sosoloid composite, the attapulgite modified mass ratio with cerium zirconium sosoloid of acid For 2~5:1;Cerium zirconium sosoloid consist of cexzr1-xo2, 0.05≤x≤0.95.
Preferably, the volume ratio of described catalyst a and described catalyst b is 5/5~9/1, and described reaction zone is 2~5 sections.
Preferably, described bifunctional catalyst combined system carries out reduction activation process before the reaction, and reducing condition is: also Former temperature is 300~500 DEG C, and reduction pressure is 0.5~4.0mpa, and reduction air speed is 1000~5000h-1, also Primordial Qi is h2.
Preferably, the thermal coupling reaction condition of described bifunctional catalyst combined system is: reaction temperature is 180~280 DEG C, reaction pressure is 4.0~7.0mpa, and reaction velocity is 2000~6000h-1, reaction gas h2The mol ratio of/co be 1.0~ 3.0.
The invention has the beneficial effects as follows:
(1) pass through to adjust the filling order of two kinds of catalyst and filling ratio in this bifunctional catalyst combined system, real Effective conversion of existing byproduct of reaction, it is possible to achieve effective modulation of alcohol product carbochain growth factor α, improves reactivity, alcohol Space-time yield and higher alcohols selectivity;
(2) there is between catalyst in this bifunctional catalyst combined system good " thermal coupling effect " and " product turns Change coupling effect ", be conducive to improving catalyst stability and extend catalyst life;
(3) reaction condition of this bifunctional catalyst combined system is gentle, and preparation process is simple, easy to operate, can apply In higher alcohols are prepared for raw material through one-step method from syngas by coal, biomass, natural gas etc., before there are preferable industrial applications Scape.
Brief description
Fig. 1 is by catalyst a cu in the embodiment of the present invention 130fe10co10k1/ pmma-sba-15 and catalyst b——cu1zn0.5fe0.15mn0.05k0.05/atp-ce0.75zr0.25o2Through different volumes ratio (1/9~9/1) filling constituted double Function catalyst combination system b//a catalyzes and synthesizes gas one-step method at a temperature of differential responses and prepares higher alcohols gained alcohol product Carbochain growth factor α.
Specific embodiment
With reference to instantiation, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate this Bright, rather than limit protection scope of the present invention.Technical staff makes according to the present invention in actual applications improvement and tune Whole, still fall within protection scope of the present invention.
The equipment using except special instruction, the present invention and reagent are the art routine commercial products.
The bifunctional catalyst combined system that the present invention provides is used for improving one-step method from syngas prepares higher alcohols (c6+Alcohol) The method of reactivity worth, first in 300~500 DEG C of temperature, pressure 0.5~4.0mpa, air speed 1000~5000h-1Under conditions of, Using h2Reduction activation process is carried out to bifunctional catalyst combined system, then in 180~280 DEG C of temperature, pressure 4.0~ 7.0mpa, air speed 2000~6000h-1Under conditions of, make h2/ co mol ratio be 1.0~3.0 synthesis gas with reduction after double work( The contact of catalyst combination system can carry out higher alcohols synthesis.
Bifunctional catalyst combined system of the present invention is made up of catalyst a and catalyst b, fills in and comprises 2~5 In the fixed bed hydrogenation reactor of section reaction zone, when for two-stage reaction area, material is entered on this bifunctional catalyst combined system edge The order levels filling of a//b or b//a, when for more than three sections reaction zones, this bifunctional catalyst assembly are pressed in stream direction System along feed stream direction press a//b//a//... or b//a//b//... order equal volume multilamellar load.Catalyst a and urging The admission space of agent b is than for 1/9~9/1, preferably 5/5~9/1.
In the application, polymer/mesoporous silicon composite that catalyst a is prepared for emulsion polymerization in situ loads cu-fe- Co base catalyst, catalyst b is the atp-czo load cu- of coprecipitation or sol-gel process or solution combustion method preparation Zn-fe base catalyst.
Unless otherwise defined or described herein, all specialties used in the present invention are skilled with art technology with scientific words Same meaning familiar to personnel institute.
Analysis method during evaluating catalyst is as follows:
Unstripped gas and tail gas form by the agilent 7890a gas with four valve six post, double tcd+fid tri- detector system Chromatograph completes, a road tcd analysis h2, another road tcd analysis o2、n2, co and co2, fid is then used for analyzing gaseous hydrocarbon Class;After reaction terminates, collect product liquid, extract and separate is carried out using hexamethylene, aqueous phase and oil phase are all using agilent7890 Gas chromatograph off-line analysiss, fid detector, ffap chromatographic column (30m × 0.25mm × 0.25 μm).
According to the content of component each in reaction end gas, with the conversion ratio of the molal quantity calculating carbon monoxide of carbon atom and respectively The selectivity of product, computing formula is as follows:
CO conversion (mol%): cco=[n (co)in- n (co)out]×100/[n(co)in]
Carbon dioxide selectivity (mol%): sco2=n (co2)×100/[n(co)in- n (co)out]
Methane selectively (mol%): sch4=n (ch4)×100/[n(co)in- n (co)out]
Alcohol selectivity (mol%): sroh=n (roh) × 100/ [n (co)in- n (co)out]
c2+Hydrocarbon-selective (mol%): shc2+=n (hc2+)×100/[n(co)in- n (co)out]
The selectivity (mol%) of other oxygenatedchemicalss: shoc=100-sco2- sch4- sroh- shc2+
Alcohol space-time yield (g ml-1(cat.)·h-1): styroh=m (roh)/[v (catalyst) × t]
Wherein: n (co)inWith n (co)outIt is respectively the molal quantity of co in gas after reacting front and reacting;n(co2)、n (ch4), n (roh) and n (hc2+) be respectively react after carbon dioxide in gas, methane, total alcohol and c2+The molal quantity of hydrocarbon;m(roh) It is respectively total alcohol quality and catalyst volume with v (catalyst);T is the response time.
The following is and the present invention is further illustrated, but content not thereby limiting the invention.
Embodiment 1~6 illustrates bifunctional catalyst combined system and its preparation of the present invention.
Embodiment 1
Prepare sba-15 molecular sieve with reference to patent zl 01126509.4;Pmma-sba- is prepared using emulsion polymerization in situ 15 composites: successively by 60g methyl methacrylate (mma) monomer, 0.2g Ammonium persulfate., 0.6gsba-15 (> 200 mesh), 0.2g sodium bicarbonate, 90g water, 1.0g dodecyl sodium sulfate and 0.5g alkylphenol polyoxyethylene op-10 are added to and are connected with In agitator, condensing tube, the four-hole boiling flask of thermometer, at room temperature after ultrasonic wave concussion 20min, occur poly- in 75 DEG C of water-baths Close reaction 3h, be cooled to less than 50 DEG C, filtered with 100 mesh standard sieves, the emulsion mass fraction obtaining is 10% aluminum sulfate Aqueous solution breakdown of emulsion obtains solid product, and deionized water is rinsed for several times repeatedly, dries, pulverized 100 mesh in vacuum drying oven Standard screen obtains pmma-sba-15.
Using preparation catalyst: by cu, fe, co, k in catalyst mass fraction be respectively 30wt%, 10wt%, 10wt%, 1wt%, weigh copper nitrate, ferric nitrate, cobalt nitrate and potassium nitrate, are configured to total concentration of metal ions and are The mixed aqueous solution of 0.5mol/l, the pmma-sba-15 powder of above-mentioned preparation is added in this mixed solution and stirs at room temperature Mix dipping 5h, then drying, 400 DEG C of roasting 4h, prepared catalyst a cu30fe10co10k1/pmma-sba-15.
Prepare sour attapulgite modified atp with reference to embodiment 3 in patent cn 104815664a;With reference to patent In cn104815664a, embodiment 1 adopts coprecipitation to prepare atp-ce0.75zr0.25o2Composite.Urged using infusion process preparation Agent: the mol ratio according to cu/zn/fe/mn/k in catalyst is 1/0.5/0.15/0.05/0.05 and their total load amount For 60wt%, the metal ion total concentration prepared containing copper nitrate, zinc acetate, ferric nitrate, manganese nitrate and potassium nitrate is 2.0mol/l Mixed aqueous solution, be added thereto to atp-ce0.75zr0.25o2Powder is simultaneously stirred at room temperature dipping 3h, then dries, 500 DEG C Roasting 3h, prepared catalyst b cu1zn0.5fe0.15mn0.05k0.05/atp-ce0.75zr0.25o2.
3:1 bilayer fills in the reaction zone of fixed bed hydrogenation reactor to catalyst a and catalyst b by volume, constitutes double Function catalyst combination system a//b.In 500 DEG C, 1.0mpa and 1000h-1Under the conditions of be passed through h2This bifunctional catalyst is combined After reduction system activation 6h, it is cooled to 80 DEG C, in t=250 DEG C, p=6.0mpa, ghsv=5000h-1Thermal coupling under the conditions of logical Enter h2The synthesis gas of/co=2.0 evaluates the higher alcohols synthesis performance of this bifunctional catalyst combined system, reaction result such as table 1 Shown.
Embodiment 2
Respectively refer to patent zl 01126509.4 and us 5102643 preparation sba-15 molecular sieve and mcm-41 molecular sieve. Pmma&pma-sba-15&mcm-41 composite is prepared using emulsion polymerization in situ: successively by 36g acrylic acid methyl ester. (ma) With 12g methyl methacrylate (mma) monomer, 0.5g potassium peroxydisulfate, 6.4gsba-15 (> 200 mesh) and 1.6gmcm-41 (> 200 Mesh), 0.5g potassium bicarbonate, 100g water, 0.5g ammonium lauryl sulfate and 0.3g fatty alcohol-polyoxyethylene ether oe-6 be added to even It is connected in the four-hole boiling flask of agitator, condensing tube, thermometer, at room temperature after ultrasonic wave concussion 60min, send out in 80 DEG C of water-baths Raw polyreaction 4h, is cooled to less than 50 DEG C, is filtered with 100 mesh standard sieves, the emulsion mass fraction obtaining is 20% chlorine Change aluminum water solution breakdown of emulsion and obtain solid product, and deionized water is rinsed for several times repeatedly, dry in vacuum drying oven, pulverized 100 mesh standard sieves obtain pmma&pma-sba-15&mcm-41 composite.
Using preparation catalyst: by cu, fe, co, la, k in catalyst mass fraction be respectively 30wt%, 30wt%, 1wt%, 2wt%, 3wt%, weigh cupric oxalate, ferric oxalate, cobalt oxalate, Lanthanum (III) nitrate and potassium chloride, are configured to total metal Ion concentration is the mixed aqueous solution of 3.0mol/l, and the pmma&pma-sba-15&mcm-41 powder of above-mentioned preparation is added this to mix Close in solution and stir at room temperature and impregnate 12h, then drying, 600 DEG C of roasting 2h, prepared catalyst a cu30fe30co1la2k3/pmma&pma-sba-15&mcm-41.
Prepare sour attapulgite modified atp with reference to embodiment 2 in patent cn 104815664a.Using sol-gel legal system Standby atp-ce0.05zr0.95o2Composite: by atp/cexzr1-xo2(mass ratio)=5/1 and cerium zirconium sosoloid structural formula ce0.05zr0.95o2(ce/zr mol ratio=1/19), weighs ce (nh4)2(no3)6With zr (no3)4·5h2O is dissolved in suitable quantity of water In, obtain the cerium zirconium precursor water solution that concentration is 2.0mol/l, (mass ratio with above-mentioned aqueous solvent is to be added thereto to ethanol 0.5:1) with citric acid (ratio with the molal quantity sum of ce, zr ion is 2:1), magnetic agitation 1h forms colloidal sol, molten to gained Add atp powder in glue, continue magnetic agitation 5h, solvent evaporated in 90 DEG C of water-baths, gained gel is dried, and at 800 DEG C Lower roasting 3h, pulverized 100 mesh standard sieves and obtained atp-ce0.05zr0.95o2Composite.Using preparation catalyst: root Mol ratio according to cu/zn/fe/co/mn in catalyst is 1/0.8/0.05/0.05/0.15 and their total load amount is 50wt%, the metal ion total concentration prepared containing Schweinfurt green, zinc oxalate, ferric nitrate, cobalt nitrate and manganese acetate is 1.0mol/l's Mixed aqueous solution, is added thereto to atp-ce0.05zr0.95o2Powder is simultaneously stirred at room temperature dipping 12h, then dries, 400 DEG C Roasting 6h, prepared catalyst b cu1zn0.8fe0.05co0.05mn0.15/atp-ce0.05zr0.95o2.
1:1 bilayer fills in the reaction zone of fixed bed hydrogenation reactor to catalyst a and catalyst b by volume, constitutes double Function catalyst combination system b//a.In 400 DEG C, 2.0mpa and 3000h-1Under the conditions of be passed through h2This bifunctional catalyst is combined After reduction system activation 3h, it is cooled to 80 DEG C, in t=220 DEG C, p=6.0mpa, ghsv=5000h-1Thermal coupling under the conditions of logical Enter h2The synthesis gas of/co=2.5 evaluates the higher alcohols synthesis performance of this bifunctional catalyst combined system, reaction result such as table 1 Shown.
Embodiment 3
Prepare mcm-41 molecular sieve with reference to patent us 5102643.Pmma-mcm-41 is prepared using emulsion polymerization in situ Composite: successively by 40g methyl methacrylate (mma) monomer, 0.1g azodiisobutyronitrile, 0.2gmcm-41 (> 200 Mesh), 0.1g sodium bicarbonate, 60g water, 0.2g Brij 35 sodium sulfate and 0.2g polyoxyethylene carboxylate Lae-4 is added in the four-hole boiling flask being connected with agitator, condensing tube, thermometer, at room temperature after ultrasonic wave concussion 30min, There is polyreaction 5h in 60 DEG C of water-baths, be cooled to less than 50 DEG C, filtered with 100 mesh standard sieves, the emulsion quality obtaining Fraction is that 5% ferric chloride in aqueous solution breakdown of emulsion obtains solid product, and deionized water is rinsed for several times repeatedly, in vacuum drying oven Dry, pulverized 100 mesh standard sieves and obtain pmma-mcm-41.Using preparation catalyst: by cu in catalyst, fe, The mass fraction of co, zr, k is respectively 10wt%, 20wt%, 5wt%, 2wt%, 1wt% and weighs Schweinfurt green, Ferrous acetate, vinegar Sour cobalt, zirconium oxychloride and potassium acetate, are configured to the mixed aqueous solution containing 20% ethanol that total concentration of metal ions is 5.0mol/l, The pmma-mcm-41 powder of above-mentioned preparation is added in this mixed solution and stirring dipping 6h at room temperature, then dry, 600 DEG C roasting 8h, prepared catalyst a cu10fe20co5zr2k1/pmma-mcm-41.
Prepare sour attapulgite modified atp with reference to patent cn 104815664a embodiment 4.Using solution combustion method preparation atp-ce0.95zr0.05o2Composite: by atp/cexzr1-xo2(mass ratio)=3/1 and cerium zirconium sosoloid structural formula ce0.95zr0.05o2(ce/zr mol ratio=19/1) weighs ce (no3)3·6h2O and zro (no3)2·2h2O is dissolved in suitable quantity of water In, obtain the cerium zirconium precursor water solution that concentration is 1.0mol/l, be added thereto to the ethylene glycol (volume ratio with above-mentioned aqueous solvent For 2:1) stir, be subsequently adding atp powder, while stirring ultrasonic disperse 5h, resulting solution be placed directly within Muffle furnace with 1.0 DEG C/min ramp, to 800 DEG C of roasting 3h, was pulverized 100 mesh standard sieves and was obtained atp-ce0.95zr0.05o2Composite. Using preparation catalyst: the mol ratio according to cu/zn/fe/rh/mn/k in catalyst is 1/1/0.5/0.1/0.1/ 0.1 and their total load amount be 25wt%, prepare containing Schweinfurt green, zinc nitrate, ferric oxalate, rhodium nitrate, manganese nitrate and citric acid The metal ion total concentration of potassium is the mixed aqueous solution of 5.0mol/l, is added thereto to atp-ce0.95zr0.05o2Powder in room Temperature lower stirring dipping 24h, then drying, 300 DEG C of roasting 6h, prepared catalyst b cu1zn1fe0.5rh0.1mn0.1k0.1/atp- ce0.95zr0.05o2.
5:1 divides five layers of reaction zone filling in fixed bed hydrogenation reactor to catalyst a and catalyst b by volume, constitutes Bifunctional catalyst combined system b//a//b//a//b.In 300 DEG C, 4.0mpa and 1200h-1Under the conditions of be passed through h2To this pair of work( After energy catalyst combination system reduction activation 5h, it is cooled to 80 DEG C, in t=280 DEG C, p=4.0mpa, ghsv=6000h-1Heat It is passed through h under coupling condition2The synthesis gas of/co=2.0 evaluates the higher alcohols synthesis performance of this bifunctional catalyst combined system, instead Answer result as shown in table 1.
Embodiment 4
Prepare sba-15 molecular sieve with reference to patent zl 01126509.4.Pmma-sba- is prepared using emulsion polymerization in situ 15 composites: successively by 80g methyl methacrylate (mma) monomer, 0.5g dibenzoyl peroxide, 32gsba-15 (> 200 Mesh), 0.3g ammonium hydrogen carbonate, 120g water, 0.8g sodium lauryl sulphate and 1.0g alkylphenol polyoxyethylene op-9 be added to even It is connected in the four-hole boiling flask of agitator, condensing tube, thermometer, at room temperature after ultrasonic wave concussion 60min, send out in 80 DEG C of water-baths Raw polyreaction 2h, is cooled to less than 50 DEG C, is filtered with 100 mesh standard sieves, the emulsion mass fraction obtaining is 30% sulfur Sour aluminum water solution breakdown of emulsion obtains solid product, and deionized water is rinsed for several times repeatedly, dries, pulverized in vacuum drying oven 100 mesh standard sieves obtain pmma-sba-15.Using preparation catalyst: by cu, fe, co, la, zr, k in catalyst Mass fraction be respectively 25wt%, 22wt%, 3wt%, 1wt%, 1wt%, 1wt% weigh copper nitrate, ferric oxalate, cobalt nitrate, Lanthanum (III) nitrate, zirconyl nitrate and potassium oxalate, are configured to the mixing water containing 10% ethylene glycol that total concentration of metal ions is 2.0mol/l Solution, the pmma-sba-15 powder of above-mentioned preparation is added in this mixed solution and stirring dipping 8h at room temperature, then dries Dry, 500 DEG C of roasting 4h, prepared catalyst a cu25fe22co3la1zr1k1/pmma-sba-15.
Prepare sour attapulgite modified atp with reference to patent cn 104815664a embodiment 5.Using solution combustion method preparation atp-ce0.8zr0.2o2Composite: by atp/cexzr1-xo2(mass ratio)=4/1 and cerium zirconium sosoloid structural formula ce0.8zr0.2o2(ce/zr mol ratio=4/1) weighs ce (no3)3·6h2O and zroci2·8h2O is dissolved in suitable quantity of water, obtains Concentration is the cerium zirconium precursor water solution of 2.5mol/l, be added thereto to ethylene glycol (be 0.5 with the volume ratio of above-mentioned aqueous solvent: 1) stir, be subsequently adding atp powder, while stirring ultrasonic disperse 1h, resulting solution is placed directly within Muffle furnace with 5.0 DEG C/min ramp to 400 DEG C of roasting 7h, pulverized 100 mesh standard sieves obtain atp-ce0.8zr0.2o2Composite.Using Preparation catalyst: the mol ratio according to cu/zn/fe/k in catalyst is 1/1/0.5/0.15 and their total load amount For 80wt%, the metal ion total concentration prepared containing copper nitrate, zinc nitrate, ferric nitrate, potassium nitrate is the mixing water of 2.0mol/l Solution, is added thereto to atp-ce0.8zr0.2o2Powder is simultaneously stirred at room temperature dipping 5h, then drying, 500 DEG C of roasting 2h, system Obtain catalyst b cu1zn1fe0.5k0.15/atp-ce0.8zr0.2o2.
1:2 divides three layers of reaction zone filling in fixed bed hydrogenation reactor to catalyst a and catalyst b by volume, constitutes Bifunctional catalyst combined system b//a//b.In 500 DEG C, 0.5mpa and 5000h-1Under the conditions of be passed through h2To this double-function catalyzing After agent combined system reduction activation 2h, it is cooled to 80 DEG C, in t=180 DEG C, p=7.0mpa, ghsv=5000h-1Thermal coupling bar It is passed through h under part2The synthesis gas of/co=3.0 evaluates the higher alcohols synthesis performance of this bifunctional catalyst combined system, reaction result As shown in table 1.
Embodiment 5
Respectively refer to patent zl 01126509.4 and us 5102643 preparation sba-15 molecular sieve and mcm-41 molecular sieve. Pmma&pma-sba-15&mcm-41 composite is prepared using emulsion polymerization in situ: successively by 10g acrylic acid methyl ester. (ma) With 40g methyl methacrylate (mma) monomer, 0.2g potassium peroxydisulfate, 2.5gsba-15 (> 200 mesh) and 10gmcm-41 (> 200 Mesh), 0.3g sodium bicarbonate, 80g water, 0.2g dodecylbenzene sodium sulfonate and 0.4g polyoxyethylene carboxylate lae-9 be added to It is connected with the four-hole boiling flask of agitator, condensing tube, thermometer, at room temperature after ultrasonic wave concussion 30min, in 75 DEG C of water-baths There is polyreaction 3h, be cooled to less than 50 DEG C, filtered with 100 mesh standard sieves, the emulsion mass fraction obtaining is 10% Aluminum sulfate aqueous solution breakdown of emulsion obtains solid product, and deionized water is rinsed for several times repeatedly, dries, pulverized in vacuum drying oven 100 mesh standard sieves obtain pmma&pma-sba-15&mcm-41 composite.Using preparation catalyst: by catalyst The mass fraction of cu, fe, co, la, zr is respectively 18wt%, 24wt%, 6wt%, 2wt%, 1wt% and weighs copper nitrate, Fructus Citri Limoniae Sour ferrum, cobaltous acetate, Lanthanum (III) nitrate and zirconium nitrate, are configured to the mixed aqueous solution that total concentration of metal ions is 1.8mol/l, will be above-mentioned The pmma&pma-sba-15&mcm-41 powder of preparation adds in this mixed solution and stirring impregnates 2h at room temperature, then dries Dry, 500 DEG C of roasting 4h, prepared catalyst a cu18fe24co6la2zr1/pmma&pma-sba-15&mcm-41.
Prepare sour attapulgite modified atp with reference to patent cn 104815664a embodiment 4.Using sol-gel process preparation atp-ce0.3zr0.7o2Composite: by atp/cexzr1-xo2(mass ratio)=3/1 and cerium zirconium sosoloid structural formula ce0.3zr0.7o2(ce/zr mol ratio=3/7) weighs ce (no3)3·6h2O and zro (no3)2·2h2O is dissolved in suitable quantity of water, Obtain the cerium zirconium precursor water solution that concentration is 5.0mol/l, be added thereto to ethanol (be 4 with the mass ratio of above-mentioned aqueous solvent: 1) and citric acid (being 1:1 with the ratio of the molal quantity sum of ce, zr ion), magnetic agitation 5h forms colloidal sol, in gained colloidal sol Add atp powder, continue magnetic agitation 1h, solvent evaporated in 60 DEG C of water-baths, gained gel is dried, and roast at 400 DEG C Burn 7h, pulverized 100 mesh standard sieves and obtain atp-ce0.3zr0.7o2Composite.Using preparation catalyst: according to urging In agent, the mol ratio of cu/zn/fe/co/mn/rh/k is 1/0.5/1/0.05/0.05/0.05/0.15 and their total load Measure as 60wt%, prepare containing copper nitrate, zinc nitrate, ferric nitrate, cobalt oxalate, manganese oxalate, rhodium nitrate and potassium citrate metal from Sub- total concentration is the mixed aqueous solution of 3.0mol/l, is added thereto to atp-ce0.3zr0.7o2Powder is simultaneously stirred at room temperature dipping 8h, then drying, 500 DEG C of roasting 4h, prepared catalyst b cu1zn0.5fe1co0.05mn0.05rh0.05k0.15/atp- ce0.3zr0.7o2.
3:1 divides three layers of reaction zone filling in fixed bed hydrogenation reactor to catalyst a and catalyst b by volume, constitutes Bifunctional catalyst combined system a//b//a.In 450 DEG C, 1.8mpa and 2000h-1Under the conditions of be passed through h2To this double-function catalyzing After agent combined system reduction activation 6h, it is cooled to 80 DEG C, in t=280 DEG C, p=4.0mpa, ghsv=2000h-1, h2/ co= The higher alcohols synthesis performance of this bifunctional catalyst combined system is evaluated, reaction result such as table 1 institute under the conditions of 1.0 thermal coupling Show.
Embodiment 6
Prepare mcm-41 molecular sieve with reference to patent us 5102643.Pmma-mcm-41 is prepared using emulsion polymerization in situ Composite: successively by 60g methyl methacrylate (mma) monomer, 0.2g azodiisobutyronitrile, 6gmcm-41 (> 200 mesh), 0.4g sodium bicarbonate, 80g water, 0.6g sodium lauryl sulphate and 0.2g alkylphenol polyoxyethylene op-10 are added to and are connected with In agitator, condensing tube, the four-hole boiling flask of thermometer, at room temperature after ultrasonic wave concussion 20min, occur poly- in 80 DEG C of water-baths Close reaction 3h, be cooled to less than 50 DEG C, filtered with 100 mesh standard sieves, the emulsion mass fraction obtaining is 10% calcium chloride Aqueous solution breakdown of emulsion obtains solid product, and deionized water is rinsed for several times repeatedly, dries, pulverized 100 mesh in vacuum drying oven Standard screen obtains pmma-mcm-41.
Using preparation catalyst: by cu, fe, co, la, k in catalyst mass fraction be respectively 22wt%, 18wt%, 8wt%, 3wt%, 2wt%, weigh copper nitrate, ferric nitrate, cobalt oxalate, lanthanum chloride and potassium chloride, are configured to total metal Ion concentration is the mixed aqueous solution containing 30% ethanol of 2.5mol/l, and the pmma-mcm-41 powder of above-mentioned preparation is added should Stir in mixed solution and at room temperature and impregnate 4h, then drying, 500 DEG C of roasting 4h, prepared catalyst a cu22fe18co8la3k2/pmma-mcm-41.
Prepare sour attapulgite modified atp with reference to patent cn 104815664a embodiment 2.With reference to patent cn 104815664a embodiment 4 adopts coprecipitation to prepare atp-ce0.5zr0.5o2Composite.Using preparation catalyst: Mol ratio according to cu/zn/fe/rh in catalyst is 1/0.6/0.1/0.01 and their total load amount is 40wt%, prepares Metal ion total concentration containing Schweinfurt green, zinc nitrate, ferric nitrate, oxalic acid rhodium be 1.5mol/l mixed aqueous solution, thereto plus Enter atp-ce0.5zr0.5o2Powder is simultaneously stirred at room temperature dipping 15h, then drying, 400 DEG C of roasting 3h, prepared catalyst b——cu1zn0.6fe0.1rh0.01/atp-ce0.5zr0.5o2.
1:1 divides four layers of reaction zone filling in fixed bed hydrogenation reactor to catalyst a and catalyst b by volume, constitutes Bifunctional catalyst combined system b//a//b//a.In 380 DEG C, 1.5mpa and 1600h-1Under the conditions of be passed through h2This difunctional is urged After agent combined system reduction activation 6h, it is cooled to 80 DEG C, in t=230 DEG C, p=7.0mpa, ghsv=3000h-1Thermal coupling Under the conditions of be passed through h2/ co=2.0 evaluates the higher alcohols synthesis performance of this bifunctional catalyst combined system.
Table 1 is that in embodiment 1~6, bifunctional catalyst combined system catalyzes and synthesizes the reaction that gas one-step method prepares higher alcohols Performance reaction result, as shown in table 1.
Table 1
As can be seen from Table 1, the higher alcohols synthesis performance of different bifunctional catalyst combined systems is significantly different, but always For body, the selectivity of higher alcohols all can reach more than 30%, and the content of higher alcohols all can reach more than 40wt%, and ch4、co2 By-product selectivity is relatively low.
Comparative example 1
This comparative example illustrates the improvement to higher alcohols synthesis performance for the bifunctional catalyst combined system.
The composition of catalyst a and catalyst b and prepare same as Example 4.
Ten kinds of modes as shown in table 2 fill in the reaction of fixed bed hydrogenation reactor to catalyst a and catalyst b respectively Area.In 400 DEG C, 1.5mpa and 1200h-1Under the conditions of be passed through h2After these catalyst systems reduction activation 4h, it is cooled to 80 DEG C, In t=250 DEG C, p=6.0mpa, ghsv=5000h-1Thermal coupling under the conditions of be passed through h2The synthesis gas of/co=2.0 evaluates them Higher alcohols synthesis performance.
The impact to higher alcohols synthesis performance for the type of feed for catalyst a and catalyst b for the table 3, as shown in table 3.
Table 2
Table 3
As can be seen from Table 3, bifunctional catalyst combined system either a//b, or the type of feed of b//a, with list Solely the catalyst a of filling compares with catalyst b, and its higher alcohols synthesis performance is all significantly improved: co conversion ratio increases, co2Selectivity reduces, and alcohol yield improves.Additionally, compared with bifunctional catalyst combined system a//b or b//a of double-deck filling, Bifunctional catalyst combined system a//b//a, b//a//b, a//b//a//b, b//a//b//a and a//b/ of multilamellar filling/ A//b//a is respectively provided with higher reactivity, higher alcohols selectivity and lower ch4、co2Deng by-product selectivity, its reaction is lived Property, higher alcohols selectivity and lower ch4、co2All it is significantly increased Deng by-product selectivity.This exactly make use of two kinds of catalysis The thermal coupling effect of agent and product conversion coupling effect, by the filling of different modes, make entirely to react towards higher alcohols synthesis Direction carry out, and then show the more superior reactivity worth of the bifunctional catalyst combined system of more double-deck filling, and total Catalyst packing volume do not change.
Embodiment 7
This example demonstrates that the admission space of bifunctional catalyst combined system b//a compares the shadow of higher alcohols synthesis performance Ring.
The composition of catalyst a and catalyst b and prepare same as Example 1.In 350 DEG C, 2.0mpa and 1000h-1Condition Under be passed through h2After these catalyst systems reduction activation 5h, it is cooled to 80 DEG C, in t=220 DEG C, p=5.5mpa, ghsv= 3000h-1Thermal coupling under the conditions of, be passed through h2The synthesis gas of/co=2.0 evaluates the higher alcohols of this bifunctional catalyst combined system Synthesis performance.The impact that the admission space of bifunctional catalyst combined system b//a compares higher alcohols synthesis performance is as shown in table 4.
Table 4
Fig. 1 is by catalyst a cu in the embodiment of the present invention 130fe10co10k1/ pmma-sba-15 and catalyst b——cu1zn0.5fe0.15mn0.05k0.05/atp-ce0.75zr0.25o2Through different volumes ratio (1/9~9/1) filling constituted double Function catalyst combination system b//a catalyzes and synthesizes gas one-step method at a temperature of differential responses and prepares higher alcohols gained alcohol product Carbochain growth factor α.Carbochain growth factor α reflects the carbochain growing ability of catalyst, as seen from Figure 1, difunctional urges Agent combined system cu1zn0.5fe0.15mn0.05k0.05/atp-ce0.75zr0.25o2//cu30fe10co10k1/ pmma-sba-15 is relatively There is under low reaction temperatures good higher alcohols synthesis performance, and alcohol product carbochain growing ability with reaction temperature raise by Decrescence little.
As can be seen from Table 4, in bifunctional catalyst combined system b//a the admission space of catalyst a and b than for 5/5 When, alcohol yield and selectivity are highest, co2Minimum with the overall selectivity of hydro carbons, and the alcohol product carbochain growth at a temperature of this It was confirmed there is good coupling effect between two kinds of catalyst in factor-alpha 0.7 (Fig. 1).Show simultaneously, of the present invention double Function catalyst module cording has preferable one-step method from syngas to prepare higher alcohols industrial applications prospect.
A kind of bifunctional catalyst the combined system above present invention being provided is used for improving one-step method from syngas preparation height The method of carbon alcohol reactivity worth is described in detail, and specific case used herein is to the principle of the present invention and embodiment party Formula is set forth, and the explanation of above example is only intended to help and understands the method for the present invention and its core concept it should refer to Go out, to those of ordinary skill in the art, under the premise without departing from the principles of the invention, the present invention can also be carried out Some improvement and modification, these improve and modify and also fall in the protection domain of the claims in the present invention.

Claims (8)

1. a kind of bifunctional catalyst combined system is used for improving one-step method from syngas and prepares higher alcohols (c6+Alcohol) reactivity worth Method it is characterised in that raw material of synthetic gas is introduced fixed bed hydrogenation reactor, by bifunctional catalyst combined system bed Layer, reaction under the conditions of thermal coupling generates higher alcohols;
Described bifunctional catalyst combined system bed is made up of catalyst a and catalyst b, and described catalyst a is polymer/Jie Hole silicon composite load cu-fe-co base catalyst, described catalyst b is sour attapulgite modified/cerium zirconium sosoloid composite wood Material load cu-zn-fe base catalyst;
Described fixed bed hydrogenation reactor comprises more than two sections of reaction zone, the bifunctional catalyst assembly in two-stage reaction area The order levels filling of a//b or b//a, the bifunctional catalyst group in more than three sections reaction zones are pressed along feed stream direction by system The order equal volume multilamellar filling of a//b or b//a is pressed along feed stream direction by fit system;
The admission space of described catalyst a and described catalyst b is than for 1/9~9/1.
2. bifunctional catalyst combined system is used for improving one-step method from syngas and prepares higher alcohols (c according to claim 16+ Alcohol) reactivity worth method it is characterised in that described catalyst a expression formula be cua1feb1coc1m1d1/ pm-ms, wherein m1 Selected from one or more of la, zr or k, a1, b1, c1 and d1 are respectively the mass fraction that cu, fe, co and m1 account for catalyst, and A1=10~30%, b1=10~30%, c1=1~10%, d1=1~5%;Described polymer pm is by monomer methyl acrylate Or methyl methacrylate or the polymerization of both mixture are formed, when the mixture for both, acrylic acid methyl ester. or methyl-prop The mass ratio of e pioic acid methyl ester is 1/4~4/1;Described mesoporous silicon ms divides selected from mcm-41 molecular sieve, mcm-48 molecular sieve, mcm-50 One of sub- sieve, sba-15 molecular sieve, sba-16 molecular sieve, msu-j molecular sieve, msu-h molecular sieve or hexagonal mesoporous silicon or Two kinds, when the mixture for two kinds of mesoporous silicon materials, the mass ratio of this two kinds of mesoporous silicon materials is 1/4~4/1;Described mesoporous Silicon is 0.005~0.4 with the mass ratio of described polymer monomer.
3. bifunctional catalyst combined system is used for improving one-step method from syngas and prepares higher alcohols (c according to claim 16+ Alcohol) reactivity worth method it is characterised in that described catalyst b expression formula be cua2znb2fec2m2d2/ pal-czo, wherein M2 is selected from one or more of co, mn, rh or k, mol ratio a2/b2/c2/d2 of cu, zn, fe and m2 be 1/ (0.5~1)/ (0.05~1)/(0.01~0.3), the mass fraction that carrier pal-czo accounts for described catalyst b is 20~75%.
4. bifunctional catalyst combined system according to claim 1 or 3 is used for improving one-step method from syngas and prepares higher alcohols (c6+Alcohol) reactivity worth method it is characterised in that the preparation method of described catalyst b comprises the steps:
(1) attapulgite modified by Pressure hydrometallurgical process preparation acid
By the solid mass ratio 3~8:1 of liquid, by mass concentration be 4~20% sulfuric acid solution and attapulgite mixing, mix homogeneously Afterwards, closed reaction vessel, is warming up to 100~150 DEG C of constant temperature stirring reaction 0.5~3h, terminates rear blowing, quiet heavy rear upper strata slurry Filtered, Cake Wash, to neutral, is dried, the acquisition acid that pulverizes and sieves is attapulgite modified;
(2) by coprecipitation or sol-gel process or solution combustion method preparation pal-czo carrier
During coprecipitation preparation pal-czo carrier, cerium salt, zirconates and sour modified attapulgite powder end are dissolved in the water, while stirring Mix side ultrasonic disperse 1~5h and obtain mixed solution, carry out coprecipitated in being simultaneously added dropwise respectively to container with ammonia at 25~80 DEG C Form sediment, maintain reaction system ph=8.0~10.0, after being added dropwise to complete, continue at the same temperature to stir aging 1~5h, filter, wash Wash precipitate to neutral, filter cake is dried, and in 400~800 DEG C of roasting 3~7h, pulverize and sieve acquisition attapulgite/cerium zirconium solid solution Composite material;
During sol-gel process preparation pal-czo carrier, cerium salt, zirconates are dissolved in the water, add ethanol and citric acid, magnetic force Stirring 1~5h forms colloidal sol, is proportionally added into sour modified attapulgite powder end, continues magnetic agitation 1~5h in gained colloidal sol, Solvent evaporated in 60~90 DEG C of water-baths, gained gel is dried in an oven, and in 400~800 DEG C of roasting 3~7h, pulverizes Sieve obtains attapulgite/cerium zirconium sosoloid composite;
During solution combustion method preparation pal-czo carrier, cerium salt, zirconates are dissolved in the water, add ethylene glycol to stir, to institute Obtain and in solution, add sour modified attapulgite powder end, ultrasonic disperse 1~5h while stirring, resulting solution is placed directly within Muffle furnace With 1.0~5.0 DEG C/min ramp to 400~800 DEG C of roasting 3~7h, pulverize and sieve acquisition attapulgite/cerium zirconium sosoloid Composite;
(3) by infusion process preparation pal-czo load cu-zn-fe base catalyst, will active component cu, zn, fe and auxiliary agent co, The nitrate of at least one of mn, rh, k or acetate or oxalates or citrate are configured to metal ion total concentration and are The mixed aqueous solution of 0.5~5.0mol/l, is added thereto to attapulgite/cerium zirconium sosoloid composite powder at room temperature Stirring dipping 3~24h, then dries, puts in Muffle furnace after pulverizing, in 300~500 DEG C of roasting 2~6h;
Above-mentioned cerium salt is selected from cerous nitrate or ammonium ceric nitrate, and zirconates is selected from one of zirconium nitrate, zirconyl nitrate or zirconium oxychloride;
The ethanol adding in above-mentioned sol-gel process preparation process is 0.5~4:1 with the mass ratio of aqueous solvent, the Fructus Citri Limoniae of interpolation Sour molal quantity is 1~2:1 with the ratio of cerium, the molal quantity sum of zirconium ion;
The ethylene glycol adding in above-mentioned solution combustion method preparation process is 0.5~2:1 with the volume ratio of aqueous solvent;
In above-mentioned attapulgite/cerium zirconium sosoloid composite, the attapulgite modified mass ratio with cerium zirconium sosoloid of acid is 2~ 5:1;Cerium zirconium sosoloid consist of cexzr1-xo2, 0.05≤x≤0.95.
5. bifunctional catalyst combined system is used for improving one-step method from syngas and prepares higher alcohols (c according to claim 16+ Alcohol) reactivity worth method it is characterised in that the admission space of described catalyst a and described catalyst b is than for 5/5~9/1.
6. bifunctional catalyst combined system is used for improving one-step method from syngas and prepares higher alcohols (c according to claim 16+ Alcohol) reactivity worth method it is characterised in that described reaction zone be 2~5 sections.
7. bifunctional catalyst combined system is used for improving one-step method from syngas and prepares higher alcohols (c according to claim 16+ Alcohol) reactivity worth method it is characterised in that described bifunctional catalyst combined system is carried out at reduction activation before the reaction Reason, reducing condition is: reduction temperature is 300~500 DEG C, and reduction pressure is 0.5~4.0mpa, reduction air speed for 1000~ 5000h-1, also Primordial Qi is h2.
8. bifunctional catalyst combined system according to claim 1 and 6 is used for improving one-step method from syngas and prepares higher alcohols (c6+Alcohol) reactivity worth method it is characterised in that described thermal coupling reaction condition is: reaction temperature be 180~280 DEG C, instead Pressure is answered to be 4.0~7.0mpa, reaction velocity is 2000~6000h-1, h2The mol ratio of/co is 1.0~3.0.
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CN113856687A (en) * 2021-11-04 2021-12-31 太原理工大学 Preparation method of doped ZnO catalyst and preparation method for synthesizing higher alcohol by using doped ZnO catalyst
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CN113856687A (en) * 2021-11-04 2021-12-31 太原理工大学 Preparation method of doped ZnO catalyst and preparation method for synthesizing higher alcohol by using doped ZnO catalyst
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