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Selective disproportionation catalyst as well as preparation method and application thereof

A catalyst and selectivity technology, applied in carbon compound catalysts, physical/chemical process catalysts, catalysts, etc., can solve the problems of low conversion rate of toluene and low selectivity of xylene products

Active Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the toluene selective disproportionation catalyst in the prior art adopts silica modified toluene conversion rate is low and p-xylene product selectivity is low

Method used

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  • Selective disproportionation catalyst as well as preparation method and application thereof
  • Selective disproportionation catalyst as well as preparation method and application thereof
  • Selective disproportionation catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The ZSM-5 molecular sieve with a silicon-aluminum molecular ratio of 25 (the molecular sieve is provided by Sinopec Catalyst Company, the same below), and the binder silica (from 40% commercially available sodium-free silica sol, the same below) are mixed and dried , 550 DEG C (constant temperature 3 hours) after roasting, obtain the catalyst modification precursor that contains the ZSM-5 molecular sieve of 79% by weight and 21% by weight of binding agent; Get described catalyst precursor 100.0g, take AgNO 3 and Mg(NO 3 ) 2 solution (containing AgNO 3 Weight concentration 5.0%, Mg(NO 3 ) 2 weight concentration 1.5%) 60.0g is impregnated with equal volume at room temperature for 2 hours, dried at 120°C for 6 hours, and continues to take SnSO 4 solution (with SnSO 4 The weight concentration is 10.0%, ) 60.0g is impregnated with equal volume at room temperature for 2 hours, dried at 120°C for 6 hours, and then calcined at 550°C for 3 hours. Continue to modify the cat...

Embodiment 2

[0072] ZSM-5 molecular sieve with a silicon-aluminum molecular ratio of 14, binder silica, mixed, molded, dried, and roasted at 500°C (6 hours) to obtain a ZSM-5 molecular sieve containing 63% by weight and 37% by weight of binder catalyst modification precursor; take the catalyst precursor 100.0g, take AgNO 3 and Ca(NO 3 ) 2 solution (containing AgNO 3 Weight concentration 3.9%, Ca(NO 3 ) 2 Weight concentration 1.0%) 60.0g is impregnated with equal volume at room temperature for 2 hours, dried at 120°C for 6 hours, and continues to take SnSO 4 60.0 g of the solution (with a weight concentration of 6.0%) was impregnated with equal volume at room temperature for 2 hours, dried at 120° C. for 6 hours, and then calcined at 550° C. for 3 hours. Continue to modify the catalyst prepared above, adopt Dow Corning 710 silicone oil 45.0g (weight concentration 40%, solvent No. 90, no aromatic hydrocarbon solvent) to immerse in equal volume at 90°C for 9 hours, keep the temperature a...

Embodiment 3

[0075] ZSM-5 molecular sieve with a silicon-aluminum molecular ratio of 99.3, binder silica and alumina (from pseudo-boehmite, commercially available) were mixed and formed, dried, and calcined at 600°C (constant temperature for 2 hours) to obtain The catalyst modification precursor of the ZSM-5 molecular sieve of 80% by weight and 10% by weight of silicon dioxide and 10% by weight of aluminum oxide; Get described catalyst precursor 100.0g, get AgClO 3 solution and Ba(NO 3 ) 2 solution (containing AgClO 3 Weight concentration 2%, Ba(NO 3 ) 2 Weight concentration: 0.5%) 60.0g is impregnated with equal volume at room temperature for 2 hours, dried at 120°C for 6 hours, and then calcined at 550°C for 3 hours. Continue to take GeCl 4 60.0 g of the solution (with a weight concentration of 6.0%) was impregnated with equal volume at room temperature for 2 hours, dried at 120° C. for 6 hours, and then calcined at 550° C. for 3 hours. Continue to modify the catalyst prepared abov...

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Abstract

The invention relates to a toluene selective disproportionation catalyst and application thereof, and mainly solves the problems of low industrial catalyst activity and low xylene product selectivity in the prior art. The invention relates to a selective disproportionation catalyst, which comprises a molecular sieve with a pore size of 0.50-0.62 nm, a binder, silica and modification elements, wherein the modification elements comprises a modification element (1) which is Ag and / or Au, a modification element (2) which is one or a plurality of Ga, Ge, Sn, Bi, Co and Ni, and a modification element (3) which is one or a plurality of second main group elements. According to the catalyst with the components, a xylene product with high p-xylene can be obtained through toluene disproportionation reaction, and the problem is well solved. The catalyst performance is improved by adopting a shape-selective modification method of the catalyst, and the catalyst can be applied to industry.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a selective disproportionation catalyst with high xylene product selectivity and its preparation method and application. The catalyst is especially used as an aromatic hydrocarbon shape-selective disproportionation catalyst. Background technique [0002] Paraxylene is an essential organic feedstock for large-scale production applications, mainly for the production of PTA. The selective disproportionation reaction of toluene is the most typical reaction with product selectivity, which converts toluene itself into a mixture of benzene and xylene, wherein the xylene product is a mixture of its three isomers, and p-xylene is the most demanded Accounted for more than 90%. Commonly used industrial catalysts use five-membered ring molecular sieves, especially ZSM-5 zeolite molecular sieves. This molecular sieve consists of 10-membered oxygen rings to form a three-dimensional pore system, and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J29/46B01J29/48B01J29/40B01J29/74C07C6/12C07C15/08
CPCB01J29/44B01J29/46B01J29/48B01J29/405B01J29/7469B01J29/7484B01J23/002C07C6/123C07C15/08C07C2529/44C07C2529/46C07C2529/48C07C2529/40C07C2529/74B01J2229/18B01J2523/00B01J2523/18B01J2523/22B01J2523/41B01J2523/43B01J2523/23B01J2523/25B01J2523/42B01J2523/24B01J2523/845Y02P20/52
Inventor 李为王月梅孔德金周亚新龚燕芳曹静
Owner CHINA PETROLEUM & CHEM CORP
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