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Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation

A dehydrogenation catalyst, isobutane technology, applied in catalyst activation/preparation, catalyst, molecular sieve catalyst and other directions, can solve the problems of uneven dispersion of precious metal active components, poor catalytic performance, etc., to achieve low cost, high selectivity, high Simple preparation process

Active Publication Date: 2021-09-21
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 defects of non-uniform dispersion of noble metal active components and poor catalytic performance in existing dehydrogenation catalysts, to provide an isobutane dehydrogenation catalyst and a preparation method thereof and a method for preparing isobutene from isobutane dehydrogenation, The dehydrogenation catalyst of the present invention can achieve better dehydrogenation activity, selectivity, stability and carbon deposition resistance under the condition of very low noble metal loading

Method used

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  • Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation
  • Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation
  • Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation

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Embodiment approach

[0040] The present invention has no special limitation on the conditions of the first mixing contact, for example, the conditions of the first mixing contact include: the temperature can be 10-60°C, preferably 25-60°C; the time can be 10-72 hours , preferably 10-30 hours; the pH value can be 1-7, preferably 3-6. In order to be more conducive to uniform mixing among the various substances, according to a preferred embodiment of the present invention, the first mixing and contacting is performed under stirring conditions.

[0041] The present invention has no special limitation on the conditions of crystallization, and the conditions of crystallization can be conventional choices in this field. For example, the conditions of crystallization can include: the temperature is 30-150°C, and the time is 10- 72 hours. Preferably, the crystallization conditions include: a temperature of 40-100° C. and a time of 20-40 hours. The crystallization is carried out by a hydrothermal crystall...

Embodiment 1

[0086] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0087] (1) Preparation of one-dimensional straight-through channel double-hole spherical mesoporous composite material (carrier)

[0088] 2.0 grams of P123 (the substance whose registration number is 9003-11-6 in the American Chemical Abstracts, its average molecular weight Mn=5800) and 15 grams of N,N-dimethylformamide (DMF) were added to 11.2 grams of 37% In a solution of hydrochloric acid and 64ml of water, stir at 40°C until P123 is completely dissolved; then add 4.45 grams of tetraethyl orthosilicate to the above solution and stir at 40°C for 24 hours, then transfer the solution to the reaction of the polytetrafluoroethylene lining In the kettle, crystallize in an oven at 60°C for 24 hours, then filter and wash to obtain the mesoporous material filter cake A1;

[0089] With the water glass of weight concentration 15% and the sulfuric acid solution of weight conc...

Embodiment 2

[0106] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0107] (1) Preparation of one-dimensional through-channel double-hole spherical mesoporous composites

[0108] 2.0 grams of P123 and 13.84 grams of N,N-dimethylformamide (DMF) were added to a solution of 16.5 grams of 37% by weight hydrochloric acid and 73ml of water, and stirred at 25°C until P123 was completely dissolved; then 6.75g (0.09 mol) ethyl orthosilicate was added to the above solution and stirred at 60° C. for 1 hour, and suction filtered to obtain the filter cake A2 of the mesoporous material.

[0109] Concentration is that the water glass of 15% by weight and the sulfuric acid solution of 12% by weight are mixed uniformly by water glass and sulfuric acid weight ratio after being 4:1, carry out stirring reaction at 40 ℃ for 1.5 hours, and the reaction product that obtains is used Sulfuric acid with a concentration of 98% by weight was used to adjust the ...

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Abstract

The invention relates to the technical field of catalyst preparation, and discloses an isobutane dehydrogenation catalyst, a preparation method thereof, and a method for preparing isobutene from isobutane dehydrogenation; wherein, the isobutane dehydrogenation catalyst includes a carrier and Pt loaded on the carrier Component and Zn component, the carrier is a one-dimensional straight-through channel double-hole spherical mesoporous composite carrier, the average particle diameter of the carrier is 30-70μm, and the specific surface area is 200-300m 2 / g, the pore volume is 0.5-2.3mL / g, the pore size distribution is bimodal, and the bimodal corresponds to the first most probable pore diameter of 5-20nm and the second most probable pore diameter of 10-40nm respectively , the first most probable pore diameter is smaller than the second most probable pore diameter; the dehydrogenation catalyst of the present invention can achieve better dehydrogenation activity, selectivity, stability and carbon deposition resistance under the condition of very low noble metal loading sex.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to an isobutane dehydrogenation catalyst, a preparation method thereof and a method for preparing 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 (FCC) unit and the by-product tert-butanol (TAB ). [0003] In recent years, with the development and utilization of isobutene downstream products, the demand for isobutene has been increasing year by year. The traditi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J35/00B01J35/02B01J35/10B01J37/02C07C11/09C07C5/333
CPCB01J29/0325B01J37/0201C07C5/3337B01J2229/18C07C2529/03B01J35/394B01J35/40B01J35/615B01J35/638B01J35/635B01J35/647C07C11/09
Inventor 刘红梅亢宇薛琳
Owner CHINA PETROLEUM & CHEM CORP
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