CN106732756A - A kind of preparation method of the molecular sieve denitrating catalysts of hierarchical porous structure ZSM 5 - Google Patents

A kind of preparation method of the molecular sieve denitrating catalysts of hierarchical porous structure ZSM 5 Download PDF

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CN106732756A
CN106732756A CN201710045342.9A CN201710045342A CN106732756A CN 106732756 A CN106732756 A CN 106732756A CN 201710045342 A CN201710045342 A CN 201710045342A CN 106732756 A CN106732756 A CN 106732756A
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zsm
molecular sieves
porous structure
hierarchical porous
molecular sieve
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彭洪根
彭程
王翔
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Nanchang University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
    • B01J29/42—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing iron group metals, noble metals or copper
    • B01J29/46—Iron group metals or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08—Heat treatment
    • B01J37/10—Heat treatment in the presence of water, e.g. steam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)

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  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

A kind of preparation method of the molecular sieve denitrating catalysts of hierarchical porous structure ZSM 5, the method comprises the steps of firstly, preparing long-chain template, then prepares the molecular sieves of hierarchical porous structure Na ZSM 5 and the molecular sieves of H ZSM 5；The molecular sieves of Cu ZSM 5 of Cu 4% must finally be contained.The present invention synthesizes 450 m by soft template method using long-chain organic formwork agent2The high-specific surface area of/g and have simultaneously mesoporous and micropore hierarchical porous structure the molecular sieves of ZSM 5, NH is then used for after the catalyst of Cu ZSM 5 is prepared at ion exchange infusion process supported active center3SCR reacts.The present invention has catalytic removal effect and stability higher, and accessory substance N within the scope of 250 400 DEG C of temperature wide under the air speed of 60000 ml/gh2The growing amount of O is little.

Description

A kind of preparation method of hierarchical porous structure ZSM-5 molecular sieve denitrating catalyst
Technical field
The invention belongs to environmental catalysis field, it is related to a step simply to synthesize hierarchical porous structure ZSM-5 molecular sieve and prepares and pass through Ion exchange infusion process processes back loading Cu method for preparing catalyst.
Background technology
Nitrogen oxides is the main cause to form the environmental problems such as acid rain, photochemical fog, ozone hole, haze, no Environment for the survival of mankind is only destroyed while endangering human health.SCR technology is current maximally effective NOx Removal methods.Zeolite molecular sieve base catalyst due to low cost, catalytic conversion efficiency is high the features such as be widely used in nitrogen oxidation Thing selective catalysis removing aspect.Cause reactant point in the duct of the accessory substance often blocking microporous molecular sieve produced in reaction Son cannot be inactivated close to avtive spot, while the particle size of conventional molecular sieve is larger, reactant and product molecule have expansion Dissipate restriction effect.Molecular sieve with micropore and mesopore orbit not only remained the ordered crystal structure of micro porous molecular sieve but also have compared with Big mesoporous pore size, it is possible to reduce and even eliminate above-mentioned both sides adverse effect.Routine prepares hierarchical porous structure molecular sieve Often using the method for selectively removing Al or molten Si, both approaches can all cause molecular sieve because of the removal of skeletal atom Structural damage, while molten silicon process is difficult to carry out, it is necessary to can just obtain mesoporous zeolite molecular sieve under severe conditions.Die Although plate method also can be used to synthesize hierarchical porous structure molecular sieve, the hierarchical porous structure molecular sieve mechanical stability of synthesis is poor, Mesoporous or macroporous structure easily caves in, it is impossible to meet the application requirement of SCR catalyst.
Molecular sieve catalyst has specific surface area very high, heat endurance high and hydro-thermal heat endurance, activity high excellent Point is received significant attention.The elementary cell of framework of molecular sieve is silicon-oxy tetrahedron and aluminum-oxygen tetrahedron, and tetrahedron center is respectively Silicon and aluminium, they are connected by sharing oxygen atom.Because molecular sieve has, specific surface area high, aperture be adjustable, active sites are easy to Modulation, adsorption capacity are high, heat endurance and the features such as hydrothermal stability high, molecular sieve have good adsorbing separation, catalysis, from The performances such as son exchange.Zeolite molecular sieve containing Cu, Fe, Co etc. shows good catalysis activity in removal of nitrogen oxide.Nitrogen Be also easy to produce in the subtractive process of oxide ammonium nitrate, ammonium sulfate etc. crystallization, these accessory substances can blocking microporous molecular sieve duct Cause reactant molecule not reach avtive spot and inactivate, and microporous molecular mesh size is small, particle big, be unfavorable for mass transfer so as to Adverse effect is brought to catalysis activity.The zeolite molecular sieve of the hierarchical porous structure with micropore-mesopore can effectively prevent nitrogen oxygen The particulate matter that compound subtractive process is produced blocks duct, while reducing diffusion and transmission of the steric hindrance beneficial to macromolecular, increases Diffusion rate of the guest molecule inside zeolite molecular sieve, slows down molecular sieve inactivation.Ammine selectivity catalytic reduction（NH3-SCR）Skill The advantages of art is because of its high catalytic efficiency has turned into be applied at present the main denitration technology of moving source.
The content of the invention
It is an object of the invention to provide a kind of preparation method of hierarchical porous structure ZSM-5 molecular sieve denitrating catalyst.This is urged Agent is in order to reduce the crystalline solid such as produced ammonium nitrate, ammonium sulfate, metal nitrate during removal of nitrogen oxide to micro- The blockage problem in hole duct, while promoting the mass-transfer performance of reactant and product molecule in bulky grain molecular sieve, increases reaction The accessibility of thing molecule and avtive spot is improving catalyst activity.The present invention provides a kind of step Hydrothermal Synthesiss multi-stage porous The preparation method of ZSM-5 molecular sieve, it is wide with temperature window, the features such as selectivity accessory substance high is few, used ammine selective Catalysis reduction when, its catalysis activity and selectivity be well positioned to meet ammine selectivity catalytic reduction technology the need for.
A kind of preparation method of hierarchical porous structure ZSM-5 molecular sieve denitrating catalyst of the present invention, it is characterised in that Comprise the following steps.
（1）The preparation of long-chain template：4.7 4,4 '-'-biphenyl diphenols of g and 3.0 g potassium hydroxide are under the protection of nitrogen It is dissolved in 300 ml absolute ethyl alcohols, is subsequently adding 30.5 g 1,6- dibromo-hexanes, 85 DEG C of backflow 20h, question response system is abundant Cooled and filtered and with the absolute ethyl alcohol and deionized water cyclic washing 3-4 time of heat, then with cold absolute ethanol washing, fully very Sky obtains intermediate 1 after drying.Take 4.3 g intermediates 1 and 29.2 g N, N, N ' N '-tetramethyl -1,6- hexamethylene diamines are dissolved in 200 ml Volume ratio is 1:In 1 acetonitrile and toluene mixed solution, and in reacting 24h at 65 DEG C, revolving is removed after solvent with cold anhydrous Ether washs 3-4 times and removes unreacted material, and vacuum drying 8h obtains intermediate 2.Take 4.2 g intermediates 2 and 4.1 g 1- Bromohexane flows back in the 150 ml acetonitriles 24h at 95 DEG C, and revolving removes solvent, washed 3-4 times with cold absolute ether, vacuum Dry 8h and obtain long-chain template CH3-(CH2)5-(CH3)2N+-(CH2)6-N+-(CH3)2-(CH2)6-O-C6H4-C6H4-O-(CH2)6- N+-(CH3)2-(CH2)5-CH3(4Br-)。
Described intermediate 1 is：Br-(CH2)6-O-C6H4-C6H4-O-(CH2)6-Br。
Described intermediate 2 is：
(CH3)2N-(CH2)6-N+(CH3)2-(CH2)6-O-C6H4-C6H4-O-(CH2)6-N+(CH3)2-(CH2)6-N(CH3)22Br-。
（2）The preparation of hierarchical porous structure Na-ZSM-5 molecular sieves：0.6 g long-chain templates obtained above, 9.9 are taken respectively G deionized waters, 0.02 g sodium metaaluminates are in beaker, and heating water bath at 60 DEG C is quick under agitation to instill the positive silicic acid of 2.08 g Tetra-ethyl ester.8h is stirred at 60 DEG C, is then transferred in 15 ml reactors at 150 DEG C and is rotated crystallization 4 days, the filtering of gained crystallization thing, Washing, dry, 550 DEG C of 6 h of roasting, obtain the Na-ZSM-5 molecular sieves of hierarchical porous structure.
（3）Take the ammonium chloride of 10 g, 1 g Na-ZSM-5,30 ml deionized waters to mix in beaker, ammonium to be chlorinated is complete Dissolve and be transferred to flask, 24 h are stirred at 80 DEG C, then filtering, washing, dry, 550 DEG C of 6 h of roasting, obtain H-ZSM-5 molecules Sieve.
（4）0.151 g copper nitrates are taken for precursor wiring solution-forming, adds 1 g H-ZSM-5 molecular sieves to be stirred at room temperature 24 h, 80 DEG C of water bath methods, 110 DEG C of lower drying of degree, 550 DEG C of 6 h of roasting obtain the Cu-ZSM-5 molecular sieves containing Cu 4%.
Compared with prior art, it is the characteristics of catalyst of the present invention：（1）Can be obtained by long-chain template one step hydro thermal method It is not corrupted to the ZSM-5 molecular sieve of hierarchical porous structure, and molecular sieve structure.（2）Accessory substance N2The growing amount of O seldom, can Avoid secondary pollution.
Brief description of the drawings
Fig. 1 is that the present invention prepares the NH that Cu mass fractions are respectively 1%, 4% Cu-ZSM-5 catalyst3- SCR activity is tested Figure.
Fig. 2 is that the present invention prepares the accessory substance N that Cu mass fractions are respectively 1%, 4% Cu-ZSM-5 catalyst2The concentration of O Test chart.
Fig. 3 is the N of the ZSM-5 molecular sieve of hierarchical porous structure prepared by the present invention2Adsorption/desorption isotherms.
Specific embodiment
In order to illustrate more clearly of the present invention, following examples are enumerated, but it is without any restrictions to the scope of the present invention.
Embodiment 1.
0.6 g long-chains template, 9.9 g deionized waters, 0.02 g sodium metaaluminates are taken respectively in beaker, water at 60 DEG C Bath heating, it is quick under agitation to instill 2.08 g tetraethyl orthosilicates.Stirred eight hours at 60 DEG C, be then transferred to 15 ml reactions Crystallization is rotated at 150 DEG C four days, gained crystallization thing is filtered, washs, dried, 550 DEG C of 6 h of roasting, products obtained therefrom is in kettle Na-ZSM-5 molecular sieves with hierarchical porous structure.Ammonium chloride, 1 g Na-ZSM-5, the 30 ml deionized waters of 10 g are taken in burning Mixing in cup, ammonium to be chlorinated is completely dissolved and is transferred to flask, and 24 h are stirred at 80 DEG C, then filtering, washing, dry, 550 DEG C of roastings 6 h are burnt, H-ZSM-5 molecular sieves are obtained.0.151 g copper nitrates are made into the 30 ml aqueous solution, 1.0 g H-ZSM-5 molecular sieves are taken Pour into wherein, gained mixed liquor stirs 24 h, subsequent 80 DEG C of water bath methods, 110 DEG C of h of drying 12,550 DEG C of roastings at room temperature After burning 6h, finished catalyst 4%Cu-ZSM-5 is obtained.
Embodiment 2.
0.6 g long-chains template, 9.9 g deionized waters, 0.02 g sodium metaaluminates are taken respectively in beaker, water at 60 DEG C Bath heating, it is quick under agitation to instill 2.08 g tetraethyl orthosilicates.Stirred eight hours at 60 DEG C, be then transferred to 15 ml reactions Crystallization is rotated at 150 DEG C four days, gained crystallization thing is filtered, washs, dried, 550 DEG C of 6 h of roasting, products obtained therefrom is in kettle Na-ZSM-5 molecular sieves with hierarchical porous structure.Ammonium chloride, 1 g Na-ZSM-5, the 30 ml deionized waters of 10 g are taken in burning Mixing in cup, ammonium to be chlorinated is completely dissolved and is transferred to flask, and 24 h are stirred at 80 DEG C, then filtering, washing, dry, 550 DEG C of roastings 6 h are burnt, H-ZSM-5 molecular sieves are obtained.0.038 g copper nitrates are made into the 30 ml aqueous solution, 1.0 g H-ZSM-5 molecular sieves are taken Pour into wherein, gained mixed liquor stirs 24 h, subsequent 80 DEG C of water bath methods, 110 DEG C of h of drying 12,550 DEG C of roastings at room temperature After burning 6h, finished catalyst 1%Cu-ZSM-5 is obtained.
Catalyst activity is tested：Take 50m g catalyst 1-4 to be placed in the quartz tube reactor of the mm of internal diameter 6, be passed through 500 Ppm NO, 500 ppm NH3, 5% O2, Ar is the reacting gas of Balance Air, and mass space velocity is 60000 ml h-1 gcat.-1, urge Agent active testing is with 10oThe heating rate of C/min is warmed up to 550 DEG C from 100 DEG C.

Claims (1)

1. a kind of preparation method of hierarchical porous structure ZSM-5 molecular sieve denitrating catalyst, it is characterised in that comprise the following steps：
（1）The preparation of long-chain template：4.7 4,4 '-'-biphenyl diphenols of g and 3.0 g potassium hydroxide are dissolved under the protection of nitrogen In 300 ml absolute ethyl alcohols, 30.5 g 1 are subsequently adding, 6- dibromo-hexanes, 85 DEG C of backflow 20h, question response system is sufficiently cool Filter afterwards and with the absolute ethyl alcohol and deionized water cyclic washing 3-4 time of heat, then with cold absolute ethanol washing, abundant vacuum is dry Intermediate 1 is obtained after dry；Take 4.3 g intermediates 1 and 29.2 g N, N, N ' N '-tetramethyl -1,6- hexamethylene diamines are dissolved in 200 ml volumes Than being 1:In 1 acetonitrile and toluene mixed solution, and in 24h is reacted at 65 DEG C, with cold absolute ether after revolving removal solvent Washing removes unreacted material for 3-4 times, and vacuum drying 8h obtains intermediate 2；Take 4.2 g intermediates 2 and 4.1 g 1- bromines oneself Alkane flows back in the 150 ml acetonitriles 24h at 95 DEG C, and revolving removes solvent, wash 3-4 times with cold absolute ether, vacuum drying 8h obtains long-chain template CH3-(CH2)5-(CH3)2N+-(CH2)6-N+-(CH3)2-(CH2)6-O-C6H4-C6H4-O-(CH2)6-N+- (CH3)2-(CH2)5-CH3(4Br-)；
Described intermediate 1 is：Br-(CH2)6-O-C6H4-C6H4-O-(CH2)6-Br；
Described intermediate 2 is：
(CH3)2N-(CH2)6-N+(CH3)2-(CH2)6-O-C6H4-C6H4-O-(CH2)6-N+(CH3)2-(CH2)6-N(CH3)22Br-；
（2）The preparation of hierarchical porous structure Na-ZSM-5 molecular sieves：0.6 g long-chain templates obtained above, 9.9 g is taken respectively to go Ionized water, 0.02 g sodium metaaluminates are in beaker, and heating water bath at 60 DEG C is quick under agitation to instill the positive silicic acid four of 2.08 g Ethyl ester；8h is stirred at 60 DEG C, is then transferred in 15 ml reactors at 150 DEG C and is rotated crystallization 4 days, the filtering of gained crystallization thing, washed Wash, dry, 550 DEG C of 6 h of roasting obtain the Na-ZSM-5 molecular sieves of hierarchical porous structure；
（3）Take the ammonium chloride of 10 g, 1 g Na-ZSM-5,30 ml deionized waters to mix in beaker, ammonium to be chlorinated is completely dissolved Flask is transferred to, 24 h are stirred at 80 DEG C, then filtering, washing, dry, 550 DEG C of 6 h of roasting, obtain H-ZSM-5 molecular sieves；
（4）0.151 g copper nitrates are taken for precursor wiring solution-forming, add 1 g H-ZSM-5 molecular sieves that 24 h are stirred at room temperature, 80 DEG C of water bath methods, 110 DEG C of lower drying of degree, 550 DEG C of 6 h of roasting obtain the Cu-ZSM-5 molecular sieves containing Cu 4%.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108579800A (en) * 2018-05-18 2018-09-28 西南林业大学 A kind of cleaning catalyst for tail gases of automobiles and preparation method thereof
WO2018204796A1 (en) * 2017-05-04 2018-11-08 The Johns Hopkins University Methods of removing and recovering phosphorus from aqueous solutions

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CN104353485A (en) * 2014-11-06 2015-02-18 清华大学 Preparation method of honeycomb carrier catalyst for molecular sieve denitration
CN106334577A (en) * 2016-09-29 2017-01-18 南昌大学 Preparation method of Mo modified Cu-SSZ-13 catalyst

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CN104353485A (en) * 2014-11-06 2015-02-18 清华大学 Preparation method of honeycomb carrier catalyst for molecular sieve denitration
CN106334577A (en) * 2016-09-29 2017-01-18 南昌大学 Preparation method of Mo modified Cu-SSZ-13 catalyst

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018204796A1 (en) * 2017-05-04 2018-11-08 The Johns Hopkins University Methods of removing and recovering phosphorus from aqueous solutions
US11401178B2 (en) 2017-05-04 2022-08-02 The Johns Hopkins University Methods of removing and recovering phosphorus from aqueous solutions
CN108579800A (en) * 2018-05-18 2018-09-28 西南林业大学 A kind of cleaning catalyst for tail gases of automobiles and preparation method thereof

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Application publication date: 20170531