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Modified SBA-15 molecular sieve material and preparation method thereof, and isobutane dehydrogenation catalyst and preparation method and application thereof

A technology for dehydrogenation catalysts and molecular sieves, which is applied in molecular sieve catalysts, physical/chemical process catalysts, hydrocarbons, etc., and can solve problems such as easy carbon deposition, low conversion rate, and high catalyst preparation costs

Active Publication Date: 2020-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the side reactions such as isomerization that exist in the existing platinum-based supported catalysts that catalyze the dehydrogenation of isobutane to prepare isobutene The selectivity of the isobutane dehydrogenation catalyst, low conversion rate, easy carbon deposition, and high platinum loading lead to defects such as high catalyst preparation costs. A modified SBA-15 molecular sieve material and the preparation of the aforementioned modified SBA-15 are provided. 15 The method of molecular sieve material, a kind of isobutane dehydrogenation catalyst and the method for preparing aforementioned isobutane dehydrogenation catalyst and the application of aforementioned isobutane dehydrogenation catalyst, the modified SBA-15 molecular sieve material provided by the present invention is used for preparing Platinum-based supported isobutane dehydrogenation catalysts can effectively reduce the amount of precious metal platinum components, and improve the catalytic activity, reactant conversion and product selectivity of isobutane dehydrogenation to isobutene, and effectively improve the surface of the catalyst. Phenomenon of coking inactivation

Method used

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  • Modified SBA-15 molecular sieve material and preparation method thereof, and isobutane dehydrogenation catalyst and preparation method and application thereof
  • Modified SBA-15 molecular sieve material and preparation method thereof, and isobutane dehydrogenation catalyst and preparation method and application thereof
  • Modified SBA-15 molecular sieve material and preparation method thereof, and isobutane dehydrogenation catalyst and preparation method and application thereof

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Embodiment approach

[0039]According to a preferred embodiment of the present invention, the method for preparing the modified SBA-15 molecular sieve material includes: in the presence of an inert gas, in a reactor equipped with stirring, add the organic solvent tetrahydrofuran, and control the temperature of the reactor to 25-40°C, quickly add magnesium chloride and titanium tetrachloride when the stirring is turned on, adjust the system temperature to 60-75°C and react at a constant temperature for 1-5 hours, until the magnesium chloride and titanium tetrachloride are completely dissolved, and the mixture containing magnesium chloride and tetrachloride is obtained. Organic solution of titanium oxide. The organic solution containing magnesium chloride and titanium tetrachloride as mentioned above is mixed and contacted with SBA-15 molecular sieve, and the ratio between the components is controlled so that, relative to 1mol of titanium, the content of magnesium is 5-18mol, tetrahydrofuran 20-200mo...

Embodiment 1

[0068] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0069] (1) Preparation of SBA-15 molecular sieve

[0070] The three-block copolymer polyethylene oxide-polyoxypropylene-polyoxyethylene is added to the hydrochloric acid aqueous solution, and the molar feed ratio is three-block copolymer polyethylene oxide-polyoxypropylene-polyoxyethylene: water: hydrogen chloride = 1 : 10157: 243, stirred at 40°C until dissolved to obtain a mixed solution; then added tetraethyl orthosilicate to it, according to molar feed ratio, triblock copolymer polyethylene oxide-polyoxypropylene-polyoxyethylene: Ethyl orthosilicate = 1:60, stirred at 40°C for 24h, then transferred the resulting solution to a polytetrafluoroethylene-lined reactor, crystallized at 160°C for 20h, then filtered and deionized Washing with water for 4 times, drying at 120°C for 5 hours after suction filtration, to obtain the raw powder of mesoporous material; washing ...

Embodiment 2

[0084] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0085] (1) Preparation of SBA-15 molecular sieve

[0086] The three-block copolymer polyethylene oxide-polyoxypropylene-polyoxyethylene is added to the hydrochloric acid aqueous solution, and the molar feed ratio is three-block copolymer polyethylene oxide-polyoxypropylene-polyoxyethylene: water: hydrogen chloride = 1 : 10000: 250, stirred at 50°C until dissolved to obtain a mixed solution; then added tetraethyl orthosilicate to it, according to molar feed ratio, triblock copolymer polyethylene oxide-polyoxypropylene-polyoxyethylene: Ethyl orthosilicate = 1:70, stirred at 50°C for 15h, then transferred the resulting solution to a polytetrafluoroethylene-lined reactor, crystallized at 155°C for 22h, then filtered and deionized Washing with water for 5 times, drying at 110°C for 6 hours after suction filtration, to obtain the original powder of mesoporous material; was...

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Abstract

The invention relates to the field of modified carriers, and discloses a modified SBA-15 molecular sieve material, a method for preparing the modified SBA-15 molecular sieve material, an iso-butane dehydrogenation catalyst, a method for preparing the iso-butane dehydrogenation catalyst and application of the iso-butane dehydrogenation catalyst. The modified SBA-15 molecular sieve material containsan SBA-15 molecular sieve, a magnesium component and a titanium component, based on the total weight of the modified SBA-15 molecular sieve material, the content of the SBA-15 molecular sieve is 20-90 wt%, and the sum of the content of the magnesium component and the titanium component respectively in terms of the magnesium element and the titanium element is 10-30 wt%, and the molar ratio of thecontent of the magnesium component in terms of magnesium to the content of the titanium component in terms of titanium is (10-30):1. When the modified SBA-15 molecular sieve material is used for preparing a platinum-based supported isobutane dehydrogenation catalyst, the modified SBA-15 molecular sieve material has relatively high isobutane conversion rate, isobutene selectivity and carbon deposition resistance.

Description

technical field [0001] The present invention relates to the field of modified carriers, in particular to a modified SBA-15 molecular sieve material and a method for preparing the aforementioned modified SBA-15 molecular sieve material, an isobutane dehydrogenation catalyst and the preparation of the aforementioned isobutane dehydrogenation Method of catalyst and use of the aforementioned isobutane dehydrogenation catalyst. Background technique [0002] Isobutene is the most important basic petrochemical raw material except ethylene and propylene, and is mainly used for the synthesis of methyl tert-butyl ether, ethyl tert-butyl ether, butyl rubber, polyisobutylene, methacrylate, methyl methacrylate , Isoprene, tert-butylphenol, tert-butylamine, 1,4-butanediol and ABS resin and other organic raw materials and fine chemicals. However, there is no natural source of isobutene, mainly from C4 components in catalytic cracking liquefied petroleum gas, by-product C4 olefins in napht...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J35/10C07C11/09C07C5/333
CPCB01J29/0325C07C5/3337B01J35/393B01J35/61C07C11/09Y02P20/52
Inventor 亢宇刘红梅刘东兵薛琳吕新平
Owner CHINA PETROLEUM & CHEM CORP
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