Isobutane dehydrogenation catalyst with spherical doughnut mesoporous material silica gel composite material as carrier, and preparation method and application of catalyst

A dehydrogenation catalyst and composite material technology, applied in the field of catalysts, can solve the problems of uneven dispersion of noble metal active components, poor catalytic activity and stability, and small average pore size, so as to reduce the risk of carbon deposition, improve catalytic performance, and improve selectivity. sexual effect

Inactive Publication Date: 2020-02-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively small average pore size of the support in the existing isobutane dehydrogenation catalyst, which affects the mass transfer and diffusion of substances in the catalytic process, and the uneven dispersion of noble metal active components, and relatively low catalytic activity and stability. Poor defect, provide a kind of method for preparing isobutane dehydrogenation catalyst and the isobutane dehydrogenation catalyst prepared by this method, and the isobutane dehydrogenation catalyst prepared by this method in isobutane dehydrogenation to produce isobutene application, the method provided by the present invention is easy to operate, environmentally friendly and low in cost, and the isobutane dehydrogenation catalyst prepared by the method can achieve better dehydrogenation activity under the condition of very low noble metal loading , selectivity, stability and carbon deposition resistance

Method used

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  • Isobutane dehydrogenation catalyst with spherical doughnut mesoporous material silica gel composite material as carrier, and preparation method and application of catalyst
  • Isobutane dehydrogenation catalyst with spherical doughnut mesoporous material silica gel composite material as carrier, and preparation method and application of catalyst
  • Isobutane dehydrogenation catalyst with spherical doughnut mesoporous material silica gel composite material as carrier, and preparation method and application of catalyst

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preparation example Construction

[0069] As mentioned above, the third aspect of the present invention provides the isobutane dehydrogenation catalyst prepared by the aforementioned preparation method and the application of the aforementioned isobutane dehydrogenation catalyst in the production of isobutene from isobutane dehydrogenation, wherein the The method for preparing isobutene from isobutane dehydrogenation comprises: dehydrogenating isobutane in the presence of a catalyst and hydrogen.

[0070] When the isobutane dehydrogenation catalyst prepared by the method provided by the invention is used to catalyze isobutane dehydrogenation to produce isobutene, both the conversion rate of isobutane and the selectivity of isobutene can be greatly improved.

[0071] According to the present invention, in order to increase the conversion rate of isobutane and prevent coking of the catalyst, preferably, the molar ratio of the amount of isobutane to the amount of hydrogen used is 0.5-1.5:1.

[0072] In the present ...

Embodiment 1

[0080] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0081] (1) Preparation of spherical donut mesoporous silica gel composite carrier

[0082] Add 2g of triblock copolymer template agent P123 and 15g of N,N-dimethylformamide (DMF) into a solution of 11.2g of 37% hydrochloric acid and 64mL of water, mix and stir until P123 is completely dissolved; then add 4.45g Ethyl orthosilicate was slowly added dropwise to the above solution at a rate of 1 g / min, stirred for 24 hours at a temperature of 40°C with a mechanical stirring rate of 350 r / min, and then the obtained solution was transferred to a polytetrafluoroethylene lining crystallize at 90°C for 24 hours, then filter and wash with deionized water for 4 times until the pH of the donut mesoporous material filter cake is 7, and then suction filter to obtain a two-dimensional hexagonal pore distribution structure Donut mesoporous material filter cake A1;

[0083] The wate...

Embodiment 2

[0102] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0103] (1) Preparation of spherical donut mesoporous silica gel composite carrier

[0104] Add 2g of triblock copolymer template agent P123 and 17.6g of N,N-dimethylformamide (DMF) to a solution of 11.2g of 37% hydrochloric acid and 64mL of water, mix and stir until P123 is completely dissolved; then add 6.68g Ethyl orthosilicate was slowly added dropwise to the above solution at a rate of 1 g / min, stirred for 24 hours at a temperature of 40°C with a mechanical stirring rate of 350 r / min, and then the obtained solution was transferred to a polytetrafluoroethylene lining crystallized at 120°C for 20 hours, then filtered and washed 4 times with deionized water until the pH of the donut mesoporous material filter cake was 7, and then suction filtered to obtain a two-dimensional hexagonal pore distribution structure Donut mesoporous material filter cake A2;

[0105] Con...

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Abstract

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst with a spherical doughnut mesoporous material silica gel material as a carrier, and a preparation method and application of the catalyst. The preparation method of the isobutane dehydrogenation catalyst comprises the following steps: (a) preparing a doughnut mesoporous material filter cake; (b) preparing a silica gel filter cake; (c) mixing the doughnut mesoporous material filter cake and the silica gel filter cake and performing ball-milling, water-pulping the solid powder obtained after ball-milling and then performing spray-drying, and then removing a template agent in the obtained product to obtain the spherical doughnut mesoporous material silica gel composite material; and (d) performing impregnation treatment on the obtained spherical doughnut mesoporous material silica gel composite material in a solution containing a Pt component precursor and a Zn component precursor, and thenperforming solvent removal treatment, drying, and baking in order. The obtained isobutane dehydrogenation catalyst has relatively good dehydrogenation activity and carbon-deposition resistance.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an isobutane dehydrogenation catalyst whose carrier is a spherical donut mesoporous silica gel composite material, a preparation method thereof, an isobutane dehydrogenation catalyst prepared by the method, and the isobutane Application of dehydrogenation catalyst in isobutane dehydrogenation to isobutene. 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 rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J35/10B01J37/02C07C5/333C07C11/09
CPCB01J37/0201B01J23/60B01J35/1066B01J35/1042B01J35/1061C07C5/3337C07C2523/60
Inventor 亢宇刘红梅刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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