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

A technology of dehydrogenation catalyst and composite material, which is applied in the application fields of isobutane dehydrogenation catalyst and isobutane dehydrogenation to isobutene, can solve the problem of small average pore size, poor catalytic activity and stability, and poor dispersion of precious metal active components. Uniformity and other issues to achieve the effect of improving selectivity, good catalytic performance, and reducing the risk of carbon deposition

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

AI Technical Summary

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

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preparation example Construction

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In the present ...

preparation example 1

[0078] Preparation Example 1: Preparation of Composite Material F1 Containing Donut Mesoporous Material C1 and Silica Gel A

[0079] (1) 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 4.45g tetraethyl orthosilicate was slowly added dropwise to the above solution at a rate of 1g / min, stirred at a temperature of 40°C for 24h at a mechanical stirring rate of 350r / min, and then transferred the resulting solution to polytetrafluoroethylene In a lined reactor, crystallize at 90°C for 24 hours, then filter and wash with deionized water for 4 times, and then perform centrifugal spray drying at 200°C at a speed of 12000r / min to obtain donut mesoporous materials Raw powder; calcined in a muffle furnace at 600°C for 24 hours to remove the templating agent to obtain donut mesoporous material C1;

[0080] (2) At 25°C, 20g of do...

preparation example 2

[0088] Preparation Example 2: Preparation of Composite Material F2 Containing Donut Mesoporous Material C2 and ES955 Silica Gel B

[0089] (1) Add 2g of triblock copolymer template agent P123 and 20g 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 6.68g tetraethyl orthosilicate was slowly added dropwise to the above solution at a rate of 1g / min, stirred for 20h at a temperature of 50°C with a mechanical stirring rate of 350r / min, and then the obtained solution was transferred to polytetrafluoroethylene In the lined reactor, crystallize at 150°C for 20h, then filter and wash with deionized water for 4 times, and then perform centrifugal spray drying at 150°C at a speed of 11000r / min to obtain donut mesoporous materials Raw powder; calcined in a muffle furnace at 500°C for 30 hours to remove the templating agent to obtain donut mesoporous material C2;

[0090] (2) At 25°C, ...

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Abstract

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst with a composite material containing a doughnut-shaped mesoporous material and silica gel as a carrier, a preparation method of the isobutane dehydrogenation catalyst, the isobutane dehydrogenation catalyst prepared by the method, and application of the isobutane dehydrogenation catalyst in preparation of isobutene through isobutane dehydrogenation. The method for preparing the isobutane dehydrogenation catalyst comprises the following steps of (a) preparing doughnut-shaped mesoporous materialraw powder; (b) performing plate-stripping agent treatment on the doughnut-shaped mesoporous material raw powder to obtain the doughnut-shaped mesoporous material; (c) mixing the doughnut-shaped mesoporous material with the silica gel to obtain the composite material containing the doughnut-shaped mesoporous material and the silica gel; and (d) performing dipping treatment in a solution containinga PT component precursor and a Zn component precursor after thermally activating the composite material, and then sequentially performing solvent removal treatment, drying and roasting. The obtainedisobutane dehydrogenation catalyst has better 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 composite material containing donut mesoporous material and silica gel, a preparation method thereof, an isobutane dehydrogenation catalyst prepared by the method, and the isobutane dehydrogenation catalyst Application of butane 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-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J29/04B01J35/10B01J37/08B01J37/02C07C11/09C07C5/333
CPCB01J23/60B01J29/043B01J35/1023B01J35/1047B01J35/1061B01J37/0018B01J37/0201C07C5/3337C07C2523/60C07C2529/04
Inventor 刘红梅亢宇刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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