Isobutane dehydrogenation catalyst using three-hole hollow spherical mesoporous molecular sieve silica gel composite material as carrier, preparation method and applications thereof

A technology of dehydrogenation catalyst and mesoporous molecular sieve, which is applied in the field of isobutane dehydrogenation to isobutene and isobutane dehydrogenation catalyst, can solve the problems of poor catalytic activity and stability, uneven dispersion of precious metal active components, etc. Stable pore structure, reduced preparation cost, and simple preparation process

Inactive Publication Date: 2020-01-31
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 provide a kind of method for preparing isobutane dehydrogenation catalyst and by the method The prepared isobutane dehydrogenation catalyst and the method for preparing isobutene from isobutane dehydrogenation, the method provided by the invention is easy to operate, environmentally friendly and low in cost, and the isobutane dehydrogenation catalyst prepared by the method is supported on precious metals When the amount is very low, it can achieve better dehydrogenation activity, selectivity, stability and carbon deposition resistance

Method used

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  • Isobutane dehydrogenation catalyst using three-hole hollow spherical mesoporous molecular sieve silica gel composite material as carrier, preparation method and applications thereof
  • Isobutane dehydrogenation catalyst using three-hole hollow spherical mesoporous molecular sieve silica gel composite material as carrier, preparation method and applications thereof
  • Isobutane dehydrogenation catalyst using three-hole hollow spherical mesoporous molecular sieve silica gel composite material as carrier, preparation method and applications thereof

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preparation example Construction

[0044] According to the present invention, in step (b), the preparation method of the silica gel is not particularly limited, and can be a conventional method for preparing silica gel in the art, for example, the method includes: mixing water glass, inorganic acid and glycerol make contact.

[0045] Preferably, the conditions for contacting the water glass, inorganic acid and glycerin include: the temperature can be 10-60°C, preferably 20-40°C; the time can be 1-5 hours, preferably 1.5-3 hours, The pH value is 2-4. In order to increase the pore size of the prepared silica gel, preferably, the weight ratio of water glass, inorganic acid and glycerol may be 3-6:1:1. In order to be more conducive to the uniform mixing between the various substances, the contact of the water glass, the inorganic acid and the glycerol is preferably carried out under stirring conditions.

[0046] According to the present invention, the water glass is an aqueous solution of sodium silicate conventi...

Embodiment 1

[0083] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0084] (1) Preparation of carrier

[0085] (1) Preparation of three-hole hollow spherical mesoporous molecular sieve silica gel composite material

[0086] Add 1g (0.0002mol) of triblock copolymer surfactant P123 and 1.69g (0.037mol) of ethanol to 28ml of acetic acid and sodium acetate buffer solution with a pH value of 4, and stir at 15°C until P123 is completely dissolved. Add 6g (0.053mol) trimethylpentane to the obtained solution afterwards, stir at 15°C for 8h, then add 2.13g (0.014mol) tetramethoxysilane to it, at 15°C, the pH value is 4.5 Stirred under conditions for 20h, then transferred the obtained solution to a polytetrafluoroethylene-lined reactor, crystallized at 60°C for 24h, then filtered and washed 4 times with deionized water, and then suction filtered to obtain a one-dimensional Hollow spherical mesoporous molecular sieve filter cake A1 with straig...

Embodiment 2

[0128] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0129] (1) Preparation of carrier

[0130] Add 1g (0.0002mol) of triblock copolymer surfactant P123 and 1.84g (0.04mol) of ethanol to 28ml of acetic acid and sodium acetate buffer solution with a pH value of 5, and stir at 15°C until P123 is completely dissolved. Then add 9.12g (0.08mol) trimethylpentane to the resulting solution, stir at 15°C for 8h, then add 3.04g (0.02mol) tetramethoxysilane to it, at 25°C, pH value is 5.5 Stirring for 15h under the condition of , then transferring the obtained solution to a polytetrafluoroethylene-lined reactor, crystallizing at 100°C for 10h, then filtering and washing with deionized water for 4 times, and then suction filtering to obtain a Hollow spherical mesoporous molecular sieve filter cake A2 with straight through channel distribution structure;

[0131] The water glass with a concentration of 15% by weight, the sulfuric ...

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Abstract

The invention relates to the field of catalysts, and discloses a method for preparing an isobutane dehydrogenation catalyst, the isobutane dehydrogenation catalyst prepared by the method, and a methodfor preparing isobutene through dehydrogenation of isobutane. The method for preparing the isobutane dehydrogenation catalyst comprises: (a) preparing a mesoporous molecular sieve filter cake with one-dimensional straight-through pore channels; (b) mixing the mesoporous molecular sieve filter cake and a silica gel, mixing, carrying out first ball milling, mixing the obtained first ball-milled slurry and water, pulping, carrying out second ball milling to obtain second ball-milled slurry, carrying out spray drying on the second ball-milled slurry, screening by adopting a cyclone separation technology, and removing the template agent from the screened product to obtain a composite material; and (c) carrying out thermal activation on the composite material, carrying out dipping treatment, removing the solvent, drying, roasting, and loading a Pt component and a Zn component. According to the invention, the obtained isobutane dehydrogenation catalyst has good dehydrogenation activity and carbon deposition resistance.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing an isobutane dehydrogenation catalyst, an isobutane dehydrogenation catalyst prepared by the method 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 in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J35/08C07C5/333C07C11/09
CPCB01J29/0325B01J35/08C07C5/3332B01J2229/18C07C2529/03
Inventor 亢宇刘红梅薛琳
Owner CHINA PETROLEUM & CHEM CORP
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