Bifunctional catalyst containing multi-stage pore EUO molecular sieve and preparation method thereof

A bifunctional catalyst, molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, molecular sieves and base exchange compounds, etc., can solve the problems of poor catalyst selectivity, limited catalytic life of molecular sieves, and high xylene loss rate

Active Publication Date: 2018-12-14
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While catalysts based on ZSM-5 zeolite, which can be used alone or in combination with other zeolites such as mordenite, do not provide the best performance
[0006] CN1901991A discloses a kind of C 8 Aromatics isomerization catalyst, using MTW type zeolite or low silica ZSM-12 as the acidic component, platinum and germanium as active metal components, when the above catalyst is applied to the isomerization of C8 aromatics, although the conversion rate of ethylbenzene is relatively low High, but the loss rate of xylene is high, indicating that there are many side reactions, the selectivity of the catalyst is poor, and the p-xylene in the product stream has not reached the equilibrium quantity
[0010] The EUO structure molecular sieve preparation methods disclosed in the above documents mainly include traditional hydrothermal method and solid-phase in-situ method, but the molecular sieve structure is basically the same, its particle size is generally large, all in the micron level, and miscellaneous crystals are prone to appear. The lifespan is severely limited, and the product yield needs to be improved

Method used

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  • Bifunctional catalyst containing multi-stage pore EUO molecular sieve and preparation method thereof
  • Bifunctional catalyst containing multi-stage pore EUO molecular sieve and preparation method thereof
  • Bifunctional catalyst containing multi-stage pore EUO molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Example 1: Preparation of hierarchically porous EUO structure EU-1 molecular sieve:

[0066] Weigh a certain amount of cetyltrimethoxysilane and dissolve it in methanol to form a solution and stir to disperse to form a solution of cetyltrimethoxysilane; then add a quantitative amount of cetyltrimethoxysilane to the solution of cetyltrimethoxysilane Water glass, NaOH, 1,6-bis(N-methylpiperidinium)hexane and deionized water H 2 O, stirred at 40°C for 6 hours to obtain a silicon source mixed solution; at 60°C, put a quantitative amount of pseudo-boehmite into the silicon source mixed solution, stirred vigorously for 90 minutes, and aged at room temperature for 12 Obtain mixture mixed sol in hour, mixed sol is used as crystallization precursor mixture, and its composition is:

[0067] Na 2 O:SiO 2 :Al 2 o 3 :LCS:OSDA:H 2 O=0.12:1:0.0211:0.0042:0.08:15;

[0068] The obtained mixed sol was placed in a crystallization kettle, and crystallized at 170°C, wherein the heati...

Embodiment 2～8

[0074] Examples 2-8: Preparation of EU-1 molecular sieves of hierarchically porous EUO:

[0075] Using the same synthetic method as in Example 1 to synthesize EU-1 molecular sieve with multi-level porous EUO structure, the selected silicon source, aluminum source, long-chain organosilane, double quaternary ammonium salt template type and feeding ratio, heating rate , crystallization temperature, crystallization time and other parameter selections, refer to Table 2; the names of the molecular sieve samples prepared in Examples 2-8 are respectively marked as A~H, and their physical and chemical properties are as shown in Table 3:

[0076] Table 2: Selection of parameters in the EU-1 molecular sieve synthesis method in the examples

[0077]

[0078]

[0079] Table 3: Physical and chemical properties of EU-1 molecular sieve products synthesized in Examples and Comparative Examples

[0080] serial number

Embodiment 9～16

[0081] Embodiment 9~16: preparation catalyst:

[0082] Kneading molding: 20.00 g of the molecular sieves prepared in Examples 1 to 5 and Comparative Examples 1 to 3 were respectively pressed by molecular sieve and Al 2 o 3 The ratio of dry mass proportioning 30:70 is mixed evenly with 59.51g of pseudoboehmite powder (produced by Shandong Aluminum Works, A12O3 content is 78.4wt%), 2.0g of turnip powder, 30g of 2.0wt% citric acid aqueous solution, Extruded, then dried at 120°C for 12 hours, and then calcined at 550°C for 4 hours to obtain the initial carrier.

[0083] Ion exchange: Take 25.0g of the above initial carrier and 250g of NH with a concentration of 1.0mol / L 4 The Cl aqueous solution was subjected to ion exchange at 90°C under continuous stirring for 3 hours, and the exchange was repeated twice, washed with deionized water until there was no chloride ion, filtered and recovered, then the particles were dried at 110°C for 12 hours, and finally calcined at 550°C for 4 ...

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Abstract

The invention discloses a bifunctional catalyst containing a multi-stage pore EUO molecular sieve and a preparation method thereof. The catalyst comprises 10 to 90wt% of an H-type multi-stage pore structure EUO molecular sieve, 9.9 to 89.9wt% of a matrix and 0.01 to 2.0wt% of a metal active component. The preparation method comprises: mixing multi-stage pore EUO molecular sieve raw powder, the matrix and a pore-expanding agent, adding an acid solution into the mixture, carrying out mixing kneading shaping, carrying out drying and roasting to remove the pore-expanding agent so that a carrier isformed, and dipping the carrier in a mixed solution containing a metal salt for activation to obtain a shaped catalyst. The multi-stage pore EUO molecular sieve is synthesized by crystallization of along-chain silane compound as a crystallization aid and a double-quaternary ammonium salt as an organic template with a double six-membered heterocyclic group substituted alkane structure. The catalyst exhibits good activity and selectivity in the hydroisomerization reaction of a C8 aromatic hydrocarbon and has a good industrial application prospect and economic value.

Description

technical field [0001] The invention relates to a bifunctional catalyst containing multi-level porous EUO molecular sieves and a preparation method thereof, belonging to the field of preparation of inorganic catalytic materials. Background technique [0002] C 8 Aromatics are a mixture of p-, m-, ortho-xylene and ethylbenzene, which can be obtained from catalytic reforming, petroleum cracking and other processes, among which p-xylene (PX) and o-xylene (OX) are important chemical raw materials , such as the basic raw material for polyester and phthalic anhydride. With the development of these industries, the demand for PX and OX is increasing rapidly. At present, the process technology for increasing the production of PX and OX is mainly xylene isomerization, which is an important means to convert m-xylene and ethylbenzene with low utilization value into PX and OX. Since the boiling points of ethylbenzene and xylene are very close, the separation is difficult, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J37/02B01J37/30C07C5/27C07C15/08C01B39/48
CPCB01J29/7446B01J37/0018B01J37/0201B01J37/30B01J2229/18C01B39/48C01P2002/72C01P2006/12C01P2006/14C01P2006/16C07C5/2737C07C15/08Y02P20/52
Inventor 王志光王建青王炳春李进
Owner CHINA CATALYST HLDG CO LTD
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