CN110152719A - A method of Pt/KL alkane hydrocarbon aromatizing catalyst is prepared by platinum source of spongy platinum - Google Patents
A method of Pt/KL alkane hydrocarbon aromatizing catalyst is prepared by platinum source of spongy platinum Download PDFInfo
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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
- B01J29/60—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L, as exemplified by patent document US3216789
- B01J29/61—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L, as exemplified by patent document US3216789 containing iron group metals, noble metals or copper
- B01J29/62—Noble metals
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- C—CHEMISTRY; METALLURGY
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
- C07C5/373—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation
- C07C5/393—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation with cyclisation to an aromatic six-membered ring, e.g. dehydrogenation of n-hexane to benzene
- C07C5/41—Catalytic processes
- C07C5/415—Catalytic processes with metals
- C07C5/417—Catalytic processes with metals of the platinum group
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Abstract
The present invention provides a kind of methods for preparing Pt/KL alkane hydrocarbon aromatizing catalyst as platinum source using spongy platinum, this method spongy platinum relatively low and from a wealth of sources using price is platinum source, the solution of spongy platinum is obtained with aqua regia dissolution, then through distilled water is repeatedly added, heating for multiple times concentration, until no longer generating acid mist；It is heated to 20-100 DEG C after reducing agent is then added at room temperature, reaction obtains the claret acid solution containing divalent Pt element；Be heated to boiling after supplement alkaline matter, until solution become colorless it is transparent；Then pass through moisturizing or be repeatedly concentrated, until being added after KL zeolite stirs dipping, drying, roasting at room temperature and Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst being made behind pH value of solution=7~12.It is deficient, expensive sufficiently to solve the problems, such as to prepare effective compound containing platinum source needed for Pt/KL aromatized catalyst at present using the method for the present invention, and the Pt/KL catalyst being prepared has excellent alkane aromatization activity.
Description
Technical field
The invention belongs to KL type zeolite catalysis technical fields, and in particular to a kind of that spongy platinum is used to prepare Pt/KL as platinum source
The method of zeolite molecules sieve-type alkane aromatized catalyst reduces as far as possible under the premise of guaranteeing aromatization performance
The preparation cost of Pt/KL catalyst.
Background technique
C6~C8Alkane is lower one kind hydrocarbon molecule, the especially C of octane number in naphtha component6~C8N-alkane,
Its research octane number (RON) is generally lower than 30.However contain a large amount of C in the naphtha cut of part6~C8Paraffinic components, so that this
Part naphtha resource is difficult to be utilized effectively as gasoline blend component.Reforming raffinate oil from catalytic reforming unit
It is that source is most commonly used, is rich in C6~C8The naphtha resource of paraffinic components.Due to the research octane number (RON) of reforming raffinate oil
Usually only in 65~70 ranges, it use it can not as gasoline blend component largely, be usually merely used as ethylene unit
Raw material be used to produce solvent naphtha on a small quantity.However, contradiction more outstanding is, partially there is the refining for resource of largely raffinating oil
Oil type enterprise does not simultaneously match ethylene cracker, so that resource of largely raffinating oil faces " factory is difficult " problem.How pumping is widened
The comprehensive Utilization Ways of excess oil are a very attractive and challenging work.
Based on considering the lower feature of octane number of raffinating oil, by the means of aromatization by the alkane in raffinating oil
Hydrocarbon is converted into the project that high added value aromatic product is great researching value.In recent years, studies in China person has developed with modification
Reforming raffinate oil aromatization technology of the H-ZSM-5 zeolite as catalyst, Typical Representative are the Nano- of Dalian University of Technology
Forming technology.This kind of technology plays certain positive effect to the effective use raffinated oil, but due to modified H-
ZSM-5 zeolite belongs to strong-acid type aromatized catalyst, so that paraffin component of raffinating oil can give birth to during aromatization
At lower dry gas and propane byproduct is largely worth, to significantly reduce the whole economic efficiency of technology.In addition, chain
It is easy to happen carbon deposit reaction on strongly acidic catalyst surface under alkane molecule hot conditions, causes the single-pass reaction period of catalyst
Shorter, this also causes detrimental effect to the economy of technology.Since alkane acid catalysis aromatization technology is with upper
Insoluble defect is stated, product is reasonably distributed, the substitute technology of remarkable in economical benefits is very necessary for exploitation.
L zeolite is synthesized for the first time in nineteen sixty-five, and with twelve-ring one-dimensional tunnel structure, channel diameter is
0.71nm.All the time, the conversion aspect of lower carbon number hydrocarbons is usually focused on using L zeolite as the catalyst research of carrier report, mainly
It is reacted including catalytic cracking, isomerization and aromatisation etc..Numerous studies discovery, the KL zeolite of supporting Pt element is for alkane
Aromatization, the advantage incomparable with other types catalyst in terms of product distribution and activity stability.The U.S.
Chevron company once successfully had developed the paraffinic naphtha aromatization using Pt/KL zeolite molecular sieve as catalyst in last century
Micronizing technology, but not can be carried out large-scale industrialization popularization finally, one of reason is that while that Pt/KL catalyst exists
There is apparent advantage, but its preparation cost is fairly expensive in aromatization effect.On the one hand, the Pt of Pt/KL catalyst
Element load capacity is higher, about 1wt.% or so；On the other hand, it is usual to prepare platinum source compound used by Pt/KL catalyst
For tetraammineplatinum chloride, the market price improves several times compared with platinum element simple substance again.Especially face the production of high-volume catalyst
When, the source of a large amount of tetraammineplatinum chlorides, which then seems, more to be lacked.How the preparation of Pt/KL aromatized catalyst is reduced as far as possible
Cost is the key that can it obtain heavy industrialization application.Reduce the preparation cost of Pt/KL aromatized catalyst not only
It is to reduce the Pt element load capacity of catalyst, if can reduce the cost for preparing catalyst in terms of required platinum source compound,
Or it for it develops a cheap quickly synthetic method and can realize and reduce the purpose of catalyst cost.Therefore, with KL zeolite
For carrier, it is excellent, advantage of lower cost to prepare Aromatization Activity as platinum source for the platiniferous substance relatively low using price
Pt/KL alkane hydrocarbon aromatizing catalyst is very significant work.
Following patent discloses the preparation method of Pt/KL zeolite molecular sieve aromatized catalyst:
Patent CN106395851B (2016) discloses a kind of preparation side of the Pt/KL aromatized catalyst of baric element
Method.Barium element is introduced into KL zeolite by adding barium source in synthesis process, but does not disclose the method for supporting Pt element in detail.
Patent CN102895992A (2011) discloses a kind of preparation method of aromatized catalyst of Pt/KL containing halogen-type.
The supporting Pt element in such a way that KL zeolite parent impregnates chloroplatinic acid.Then pass through dipping NH4Cl or NH4The solution such as F are by halogen
It is introduced on catalyst.Under the action of the catalyst, using normal heptane as reaction raw materials, at 450 DEG C, 1.0MPa, 4h-1, H2/
Under the reaction condition that oily mole coin is 7, the aromatics yield of 45~50wt.% can reach.
Patent CN101746774B (2008) discloses a kind of preparation side of Pt/KL aromatized catalyst containing tin element
Method.Tin element introduces in KL sieve synthesis procedure.By impregnating Pt (NH to stanniferous KL molecular sieve3)4Cl2Solution obtains
Pt-SnKL aromatized catalyst.
Patent US7902105B2 (2007) discloses a kind of preparation method of aromatized catalyst of Pt/KL containing halogen-type.Leaching
The platinum source that stain uses introduces halogen on catalyst by the way of impregnating halogenation ammonium salt solution based on tetraammineplatinum chloride.
Patent US7153801B2 (2003) discloses a kind of preparation method of aromatized catalyst of Pt/KL containing halogen-type.System
The platinum source that standby catalyst uses includes one of chloroplatinic acid, ammonium chloroplatinite, four ammino platinum of nitric acid, tetraammineplatinum chloride or several
Kind, the introducing of halogen is realized using solution of the dipping containing halogenation quaternary amine.
Patent US6177601B1 (1999) discloses a kind of preparation method of Pt/KL aromatized catalyst containing tin element.
KL zeolite parent is first through containing NH4HF2And SnF4Aqueous solution swap processing, then impregnate Pt (NH again3)4Cl2Solution.
There are also the preparation methods that more patent relates to Pt/KL zeolite molecular sieve aromatized catalyst, such as:
CN108239554A(2018),CN108033462A(2018),CN107916132A(2018),
US2018169638A1(201 8),CN106367116A(2017),US2017128920A1,CN105636693A(2016),
CN104107716B(2016),CN10 3361114B(2016),US2016288108A1(2016),CN104292067A
(2015),US8664145B2(2014),US866414 4B2,CN101747933B(2013),CN102530985B(2013),
CN102476809B(2013),US8362310B2(2013),U S8569555B2(2013),US8461404B2(2013),
US2013296625A1(2013),US2012108875A1(2012),US82 73931B2(2012),US2011137092A1
(2011),US7932425B2(2011),US2010160150A1(2010),US20101 60147A1(2010),
US201060702A1(2010),CN101209947A(2008),US2008027255A1(2008),US2008 255398A1
(2008),US2005079972A1(2005),US2004259719A1(2004),US6096675A(2000),US6096 193A
(2000),US6063724A(2000),US6051128A(2000),US4698322A(1987),US4699894A(1987),US
4493901A(1985).Above-mentioned patent all refers to the preparation method of Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst, but
Costly (majority is Pt (NH to compound containing platinum used in supporting Pt element on KL zeolite in preparation process3)4Cl2),
And all patents all do not refer to the source situation of the compound containing Pt, also without reference to such as how relatively low platinum source system of price
The content of the Pt/KL alkane hydrocarbon aromatizing catalyst of standby advantage of lower cost.
In addition, there are many preparation sides that open source literature also reports Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst
Method.Such as:
Open source literature China rare earth journal 1998 (16): 170-173 reports a kind of Pt/KL zeolite molecular sieve aromatisation and urges
The preparation method of agent.Catalyst is made using cisplatin solution dipping KL zeolite, and adds the second metal lanthanum element and is urged with improving
The Aromatization Activity and sulfur resistance of agent.
Open source literature Acta PhySico-Chimica Sinica 1997 (13): 573-576 reports the KL zeolite of a kind of supporting Pt and Fe element
Preparation method.Its specific preparation method is using Pt (NH3)2Cl2With Fe (NO3)3Mixed solution KL zeolite is impregnated
Catalyst needed for being made.
Open source literature Jilin University journal 2014 (52): 1342-1348 reports a kind of Pt/KL aromatisation for mixing Pd and urges
The preparation method of agent, specific method are using H2PtCl4Solution impregnates PdCl2KL zeolite after exchange.
Open source literature petrochemical industry 1993 (23): 225-229 reports a kind of preparation method of PtBa/KL zeolite, uses
Contain Ba (NO3)2With Pt (NH3)2Cl2Solution to KL zeolite carry out co-impregnation operate be made catalyst.
Open source literature Journal of Catalysis 2000 (191): 116-127 report it is a kind of using chemical gaseous phase
The Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst of the method preparation of deposition.The platinum source that deposition process uses is levulinic
The Pt species dispersion degree of ketone platinum, gained catalyst surface is higher.
Open source literature Applied Catalysis A:General 1993 (106): 9-25 reports one kind containing fluorine element
Pt/KL aromatized catalyst preparation method.Its main feature is that fluorination treatment is first carried out to KL zeolite using chlorotrifluoromethane, then
Using Pt (NH3)4Cl2Solution carries out dip loading to the KL zeolite after fluorination, and gained catalyst has excellent activity stabilized
Property.
In addition, following discloses document also describes the preparation method of Pt/KL zeolite molecular sieve aromatized catalyst, such as:
China rare earth journal 2017 (35): 203-208；Journal of Catalysis 2016(340):66-75；
Journal of Catalysis 2010(270):242-248；Catal Surv Asia 2010(14):96-102；Petroleum refining
System and chemical industry 2009 (40): 1-4；Petroleum refining and chemical industry 2007 (38): 18-21；Journal of Catalysis 2003
(218):1-11；China rare earth journal 1998 (16): 319-323；Journal of Molecular Catalysis 1998 (12): 113-118；Acta PhySico-Chimica Sinica
1996(12):939-941；Petroleum journal (PETROLEUM PROCESSING) 1996 (12): 13-18；Industrial Catalysis 1995 (4): 13-17；
Journal of Catalysis 1995(155):131-140；It is catalyzed journal 1994 (15): 195-199；Petrochemical industry 1992
(21):596-599；Journal of Catalysis 1992(133):342-357；Petroleum refining 1990 (9): 27-35；
Journal of Catalysis 1990(125):387-389；Applied Catalysis A:General 1988(45):
15-22.Document disclosed above all refers to the preparation method of Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst, but more collection
In in the Aromatization Activity and the second metallic element of addition for investigating catalyst to the shadow of catalyst physico-chemical property and reactivity worth
Content in terms of the basic research such as sound, not on how to the Pt/ relatively low with the relatively low platinum source preparation cost of price
The research of KL alkane hydrocarbon aromatizing catalyst.
Summary of the invention
For solve Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst preparation process in required platiniferous element compound compared with
For valuableness, leading to catalyst, the cost is relatively high, and when this kind of platiniferous element compound demand is larger source scarcity problem,
The present invention provide it is a kind of with basic, the opposite platinum simple substance-spongy platinum being easy to get for basic substance, by simply chemically reacting
The method of the Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst of advantage of lower cost is made with catalyst preparation process.
The method that the present invention prepares Pt/KL alkane hydrocarbon aromatizing catalyst as platinum source using spongy platinum provides one kind with sea
Continuous platinum is platinum source, is simply chemically reacted and is converted into needed for preparing Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst
Effective compound containing platinum aqueous solution, and KL zeolite is impregnated with it and finally obtains Pt/KL zeolite molecular sieve alkane Aromatizatian catalytic
The method of agent, includes the following steps:
(1) spongy platinum is added in the chloroazotic acid prepared in advance, boiling is set into chloroazotic acid heating, until spongy platinum is all molten
Solution；The quality of required chloroazotic acid and the mass ratio of spongy platinum are 10~1000:1；
(2) distilled water is added in the solution for sufficiently having dissolved spongy platinum in step (1), then heating concentration, after concentration
Distilled water is added, continues to be concentrated, it is repeated multiple times, until the solution of boiling no longer generates acid mist；
(3) at room temperature, reducing agent is added in the solution obtained to step (2), controls mole of reducing agent and spongy platinum
Than for 1:1~1:2, and the solution that joined reducing agent is heated to 20~100 DEG C, until reduction reaction is finished, obtained
Claret acid solution containing divalent Pt element；
(4) claret acid solution obtained in step (3) is heated to boiling, is keeping boiling and is carrying out high degree of agitation
Under conditions of, alkaline matter is supplemented into solution, until claret solution become colorless it is transparent；It is then more by moisturizing or progress
Secondary concentration, until pH value of solution=7~12, and by moisturizing or concentration by the quality of liquor capacity and the KL zeolite that will be impregnated it
Than controlling at 5:1~10:1 (ml/g)；
(5) KL zeolite is added in (4) in acquired solution, at room temperature stirring dipping 12~24 hours, then through revolving
Turn evaporation, moisture is evaporated；Gained catalyst is dried overnight in baking oven, is then roasted in air atmosphere in 350 DEG C~400 DEG C
It burns 4~6 hours.
In the above method of the present invention, preferred steps (3) reducing agent that need to be added is potassium thiosulfate, sulfurous acid
Potassium, hydrazine hydrate, hydrazine hydrochloride, SO2One or more of aqueous solution.
Solution after reducing agent is added in preferred steps (3) is heated to 40~70 DEG C of progress reduction reactions.
The alkaline matter being added in preferred steps (4) is n-butylamine, in propylamine, ammonium hydroxide, KOH, tetrapropylammonium hydroxide
It is one or more of.
In preferred steps (4) moisturizing or repeatedly concentration after solution pH value control 7~9.
The present invention using spongy platinum as platinum source prepare Pt/KL alkane hydrocarbon aromatizing catalyst method have the beneficial effect that with
The relatively low and from a wealth of sources spongy platinum of price is as the source Pt, and by a series of simple and easy chemical reactions, obtain can
Effective compound solution containing Pt is used to prepare needed for Pt/KL zeolite molecular sieve alkane hydrocarbon aromatizing catalyst, then molten with gained
Liquid carries out conventional dip operation to KL zeolite, can be prepared by the excellent Pt/KL catalyst of Aromatization Activity.The method of the present invention
It is deficient, expensive sufficiently to solve the problems, such as to prepare effective compound containing platinum source needed for Pt/KL aromatized catalyst at present.
Especially large scale preparation Pt/KL aromatized catalyst when, the present invention can more play the role of practical and apparent.Further research
It was found that the Pt/KL catalyst that the method for the present invention is prepared has excellent alkane aromatization activity, in centainly reaction item
(500 DEG C of temperature, pressure 0.4MPa, air speed 1.5h under part-1, face hydrogen), using normal heptane as raw material, aromatics yield achieved is close
Or higher than the Pt/KL aromatized catalyst using the preparation of relatively expensive platinum source.In addition, it is can also be applied to preparing other Pt
Element is the catalyst of active component.
Specific embodiment
Technical solution of the present invention is described further below by embodiment, but the present invention is not by these embodiments
Limitation.
Embodiment 1:
(1) 1g spongy platinum is placed in prepared 50ml chloroazotic acid (being 3:1 by the volume ratio of concentrated hydrochloric acid and concentrated nitric acid) in advance
In, it is heated to boiling, until spongy platinum all dissolves.
(2) it has sufficiently been dissolved in (1) in the solution of spongy platinum and a large amount of distilled water is added, then heating concentration, after concentration
A large amount of distilled water are added, continue to be concentrated, it is repeated multiple times, until the solution of boiling no longer generates acid mist；Finally by solution
It is concentrated into about 50ml.
(3) hydrazine hydrate that 0.3g concentration is 85wt.% is added to solution obtained in (2), is uniformly mixed；It is hydrated being added
The solution of hydrazine is heated to 70 DEG C, until reduction reaction is finished, obtains the claret acid solution containing divalent Pt element.
(4) claret solution obtained in step (3) is heated to boiling, in the item for keeping boiling and carrying out high degree of agitation
Under part, a large amount of ammonium hydroxide are supplemented into solution, until claret solution become colorless it is transparent；It is then carried out by moisturizing repeatedly dense
Contracting, until pH value of solution controls liquor capacity in 500ml close to 7, and by concentration.
(5) 100g KL zeolite (Japanese TOSOH company sells) is added in (4) in acquired solution, is stirred at room temperature
Dipping 24 hours, then through rotary evaporation, moisture is evaporated；Gained catalyst is dried overnight in baking oven, then in 350 DEG C
It is roasted 4 hours under air atmosphere.
Embodiment 2:
Embodiment 1 is repeated, but the reducing agent being added in step (3) is changed to 0.5g hydrazine hydrochloride, other operating procedures are constant.
Embodiment 3:
Embodiment 1 is repeated, but the solution after addition hydrazine hydrate in step (3) is heated to 50 DEG C, other operating procedures are not
Become.
Embodiment 4:
Embodiment 1 is repeated, but a large amount of ammonium hydroxide supplemented in step (4) are changed to a large amount of n-butylamines, other operating procedures
It is constant.
Embodiment 5:
Embodiment 1 is repeated, but a large amount of ammonium hydroxide supplemented in step (4) are changed to a large amount of propylamine, other operating procedures are not
Become.
Embodiment 6:
Embodiment 1 is repeated, but the colourless solution obtained in step (4) is finally adjusted to pH=9, other operating procedures
It is constant.
Comparative example 1:
Take the commercially available Pt (NH of 1.71g3)4Cl2It is dissolved in 500ml distilled water, by 100g KL zeolite, (Japanese TOSOH company goes out
Sell) it is added in above-mentioned solution, stirring dipping 24 hours, then through rotary evaporation, moisture is evaporated at room temperature.Gained catalysis
Agent is dried overnight in baking oven, is then roasted 4 hours in air atmosphere in 350 DEG C.
Comparative example 2:
Take the commercially available Pt (NH of 2.00g3)4NO3It is dissolved in 500ml distilled water, by 100g KL zeolite, (Japanese TOSOH company goes out
Sell) it is added in above-mentioned solution, stirring dipping 24 hours, then through rotary evaporation, moisture is evaporated at room temperature.Gained catalysis
Agent is dried overnight in baking oven, is then roasted 4 hours in air atmosphere in 350 DEG C.
The performance test results
By the reactivity of 1~2 gained Pt/KL alkane hydrocarbon aromatizing catalyst of the embodiment of the present invention 1~6 and comparative example
Energy comparing result is shown in Table 1:
The reaction of 1~2 gained Pt/KL alkane hydrocarbon aromatizing catalyst of 1 embodiment of the present invention 1~6 of table and comparative example
Performance comparison
Raw material: normal heptane
Reaction condition: 500 DEG C of temperature；Pressure 0.4MPa；Air speed 1.5h-1；Hydrogen to oil volume ratio 700.
Claims (5)
1. a kind of method for preparing Pt/KL alkane hydrocarbon aromatizing catalyst as platinum source using spongy platinum, which is characterized in that including as follows
Step:
(1) spongy platinum is added in chloroazotic acid, boiling is set into chloroazotic acid heating, until spongy platinum all dissolves；The matter of required chloroazotic acid
The mass ratio of amount and spongy platinum is 10~1000:1；
(2) distilled water is added in the solution for sufficiently having dissolved spongy platinum in step (1), then heating concentration, adds again after concentration
Enter distilled water, continues to be concentrated, it is repeated multiple times, until the solution of boiling no longer generates acid mist；
(3) at room temperature, reducing agent is added in the solution obtained to step (2), the molar ratio for controlling reducing agent and spongy platinum is
1:1~1:2, and the solution that joined reducing agent is heated to 20~100 DEG C, until reduction reaction is finished, contained
The claret acid solution of divalent Pt element；
(4) claret acid solution obtained in step (3) is heated to boiling, in the item for keeping boiling and carrying out high degree of agitation
Under part, alkaline matter is supplemented into solution, until claret solution become colorless it is transparent；It is then repeatedly dense by moisturizing or progress
Contracting, until pH value of solution=7~12, and by moisturizing or be concentrated the mass ratio control of liquor capacity and the KL zeolite that will be impregnated
System is at 5:1~10:1 (ml/g)；
(5) KL zeolite is added in (4) in acquired solution, stirring dipping 12~24 hours, then steams through rotation at room temperature
Hair, moisture is evaporated；Gained catalyst is dried overnight in baking oven, then roasts 4 in air atmosphere in 350 DEG C~400 DEG C
~6 hours.
2. the method according to claim 1, wherein reducing agent described in step (3) is potassium thiosulfate, Asia
Potassium sulfate, hydrazine hydrate, hydrazine hydrochloride, SO2One or more of aqueous solution.
3. the method according to claim 1, wherein the solution being added after reducing agent in step (3) is heated to 40
~70 DEG C of progress reduction reactions.
4. the method according to claim 1, wherein be added in step (4) alkaline matter be n-butylamine,
One or more of propylamine, ammonium hydroxide, KOH, tetrapropylammonium hydroxide.
5. the method according to claim 1, wherein in step (4) moisturizing or repeatedly concentration after solution pH value
Control is 7~9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111604086A (en) * | 2020-06-19 | 2020-09-01 | 山东省科学院能源研究所 | Preparation method and application of platinum-based normal paraffin aromatization catalyst |
| CN112495428A (en) * | 2020-12-30 | 2021-03-16 | 北京交通大学 | Catalyst for catalyzing n-hexane aromatization reaction through rail regulation and control, preparation method and application |
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