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Isobutane dehydrogenation catalyst with supporter being mesoporous molecular sieve with three-dimensional cubic cage-shaped pore channel distribution structure as carrier as well as preparation method and application thereof

A technology of dehydrogenation catalyst and mesoporous molecular sieve, which is applied in the direction of molecular sieve catalyst, physical/chemical process catalyst, organic chemistry, etc. It can solve the problems of poor catalytic activity and stability, uneven dispersion of noble metal active components, etc., and the conditions are easy to control , reduce the risk of carbon deposition, and reduce the effect of preparation costs

Active Publication Date: 2019-12-27
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 shortcomings of the existing isobutane dehydrogenation catalyst noble metal active components such as uneven dispersion, poor catalytic activity and stability, and to provide a carrier with mesoporous cells with a three-dimensional cubic cage-like channel distribution structure. The isobutane dehydrogenation catalyst of molecular sieve and its preparation method and the application of the isobutane dehydrogenation catalyst prepared by the method and the isobutane dehydrogenation catalyst in isobutane dehydrogenation to isobutene, the method provided by the invention is easy The operation, environmental friendliness and low cost, and the isobutane dehydrogenation catalyst prepared by this method can achieve better dehydrogenation activity, selectivity, stability and product resistance under the condition that the precious metal loading is very low. Carbon

Method used

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  • Isobutane dehydrogenation catalyst with supporter being mesoporous molecular sieve with three-dimensional cubic cage-shaped pore channel distribution structure as carrier as well as preparation method and application thereof
  • Isobutane dehydrogenation catalyst with supporter being mesoporous molecular sieve with three-dimensional cubic cage-shaped pore channel distribution structure as carrier as well as preparation method and application thereof
  • Isobutane dehydrogenation catalyst with supporter being mesoporous molecular sieve with three-dimensional cubic cage-shaped pore channel distribution structure as carrier as well as preparation method and application thereof

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Embodiment approach

[0041] The present invention has no particular limitation on the conditions of the mixing and contacting, for example, the conditions of the mixing and contacting may include: a temperature of 25-60° C., a time of 10-72 hours, and a pH value of 1-7. In order to be more conducive to the uniform mixing of various substances, according to a preferred embodiment of the present invention, the mixing and contacting is carried out under stirring conditions.

[0042] In the present invention, the crystallization conditions are not particularly limited. For example, the crystallization conditions may include: a temperature of 30-150°C, preferably 90-150°C; a time of 10-72h, preferably 10 -40h. According to a preferred embodiment, the crystallization is carried out by hydrothermal crystallization.

[0043] The present invention is not particularly limited to the condition that described water glass, mineral acid and glycerin contact, for example, in step (b), the condition that describ...

Embodiment 1

[0090] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0091] (1) Preparation of carrier

[0092] 2g (1.4×10 -4 mol) template agent F108, 5.24g (0.03mol) of K 2 SO 4 Stir with 60g of hydrochloric acid solution with a normality of 2 (2N) at 38°C until F108 is completely dissolved;

[0093] Add 4.2g (0.02mol) of tetraethyl orthosilicate to the above solution, stir at 38°C for 15min, and stand at 38°C for 24h;

[0094] Then it was transferred to an agate-lined reactor, crystallized at 100°C for 24 hours, then filtered and washed with deionized water for 4 times, and then suction filtered to obtain mesoporous molecular sieve filter cake A1.

[0095] The water glass with a concentration of 15% by weight, the sulfuric acid solution with a concentration of 12% by weight and glycerol are mixed in a weight ratio of 5:1:1 and contacted for 1.5h at 30°C, and then the concentration is 98% by weight sulfuric acid to adjust the pH...

Embodiment 2

[0116] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0117] (1) Preparation of carrier

[0118] 1.46g (1×10 -4 mol) template agent F108, 6.96g (0.04mol) of K 2 SO 4 Stir with 60g of hydrochloric acid solution with a normality of 2 (2N) at 38°C until F108 is completely dissolved;

[0119] Add 3.1g (0.014mol) of tetraethyl orthosilicate to the above solution, stir at 38°C for 15min, and stand at 38°C for 24h;

[0120] Then it was transferred to an agate-lined reactor, crystallized at 120° C. for 30 h, then filtered and washed with deionized water for 4 times, and then suction filtered to obtain mesoporous molecular sieve filter cake A2.

[0121] The water glass with a concentration of 15% by weight, the sulfuric acid solution with a concentration of 12% by weight and glycerol are mixed in a weight ratio of 4:1:1 and contacted at 40°C for 1.5h, and then with a concentration of 98% by weight sulfuric acid to adjust the...

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Abstract

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst with supporter being a mesoporous molecular sieve with a three-dimensional cubic cage-shaped pore channel distribution structure, as well as a preparation method and application of the isobutane dehydrogenation catalyst. The method comprises the following steps: (a) preparing a mesoporous molecularsieve filter cake; (b) preparing a silica gel filter cake; (c) mixing the mesoporous molecular sieve filter cake and the silica gel filter cake, adding a binder, carrying out ball milling and spray drying, and removing the template agent and the binder in the obtained product; and (d) carrying out thermal activation treatment on the supporter obtained in the step (c), then carrying out dipping treatment in a solution containing a Pt component precursor and a Zn component precursor, and then sequentially carrying out solvent removal treatment, drying treatment and roasting treatment. Accordingto the method, the isobutane dehydrogenation catalyst with high catalytic activity can be synthesized by using a low-cost silicon source.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an isobutane dehydrogenation catalyst whose carrier is a mesoporous molecular sieve having a three-dimensional cubic cage-like pore distribution structure, a preparation method thereof, and an isobutane dehydrogenation catalyst prepared by the method and The application of the isobutane dehydrogenation catalyst in the preparation of isobutene from isobutane dehydrogenation. Background technique [0002] Isobutylene is a very important organic chemical raw material, mainly used in the preparation of methyl tert-butyl ether, butyl rubber, methyl ethyl ketone, polyisobutylene, methyl methacrylate, isoprene, tert-butylphenol, tert-butylamine, 1, Various organic raw materials and fine chemicals such as 4-butanediol and ABS resin. The main source of isobutene is the by-product C4 fraction of naphtha steam cracking ethylene unit, the by-product C4 fraction of refinery fluid catalytic cracking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/04C07C5/333C07C11/16
CPCB01J29/043B01J29/0325C07C5/333B01J2229/18C07C11/16Y02P20/52
Inventor 刘红梅亢宇薛琳
Owner CHINA PETROLEUM & CHEM CORP
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