Dehydrogenation catalyst and preparation method and application thereof

A technology of dehydrogenation catalyst and metal promoter, applied in catalyst activation/preparation, catalyst, dehydrogenation to hydrocarbon production, etc., can solve the problems of poor catalytic performance and uneven dispersion of precious metal active components, achieve good catalytic performance, reduce Risk of carbon deposition and good catalyst stability

Active Publication Date: 2019-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the existing dehydrogenation catalyst noble metal active components such as uneven dispersion and poor catalytic performance, to provide a dehydrogenation catalyst and preparation method and application thereof, the dehydrogenation catalyst of the present invention has a higher loading capacity of the noble metal In the case of very low, better dehydrogenation activity, selectivity, stability and carbon deposition resistance can be achieved

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  • Dehydrogenation catalyst and preparation method and application thereof
  • Dehydrogenation catalyst and preparation method and application thereof
  • Dehydrogenation catalyst and preparation method and application thereof

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preparation example Construction

[0044] In the present invention, there is no special requirement for the ultrasonic conditions in which the aluminum hydroxide alcohol gel and the magnesium salt alcohol solution are contacted in the preparation method of the magnesium-aluminum composite carrier, as long as the magnesium atoms can be uniformly dispersed and enter the aluminum hydroxide skeleton to form magnesium aluminum composite carrier. For example, the ultrasonic conditions generally include: a temperature of 10-100° C., a time of 10-100 min, and a power of 100-300 W. Preferably, in order to disperse magnesium atoms more uniformly, the ultrasonic conditions generally include: a temperature of 30-80°C, the time is 30-60min, and the power is 150-250W.

[0045] In the present invention, the contact reaction in the preparation method of the magnesium-aluminum composite carrier can be carried out under stirring. In the present invention, the stirring conditions are not particularly limited, and may be conventi...

Embodiment 1

[0071] (1) Preparation of magnesium-aluminum composite carrier

[0072] 75.0g Al(NO 3 ) 3 9H 2 O was prepared as a 1000ml aqueous solution. Add 800ml of ammonia water with a concentration of 0.3mol / L in the three-necked flask; under the condition of continuous stirring, add the above-mentioned configured Al(NO 3 ) 3 aqueous solution. During the dropwise addition, ammonia water with a concentration of 0.3 mol / L was continuously added to the three-necked flask to maintain the pH of the system=11. After the whole dropping process was completed, the stirring was continued for 2 hours, and then left to stand at room temperature for aging for 10 hours, and the solid product aluminum hydroxide hydrogel was separated and obtained. Add 2000ml of distilled water to the obtained aluminum hydroxide hydrogel for cleaning, fully beat and stir, then suction filter, and repeat cleaning 6 times according to the cleaning method. Then wash the aluminum hydroxide hydrogel with 500 ml of ab...

Embodiment 2

[0078] (1) Preparation of magnesium-aluminum composite carrier

[0079] 51.3g Al 2 (SO 4 ) 3 Prepare 1000ml of aqueous solution. Add 600ml of ammonia water with a concentration of 0.5mol / L into the three-necked flask; under the condition of continuous stirring, add the above-mentioned configured Al 2 (SO 4 ) 3 aqueous solution. During the dropwise addition, ammonia water with a concentration of 0.5 mol / L was continuously added to the three-neck flask to maintain the pH of the system=12. After the whole dropping process was completed, the stirring was continued for 1 hour, and then aged at room temperature for 2 hours, and the solid product aluminum hydroxide hydrogel was separated and obtained. Add 2000ml of distilled water to the obtained aluminum hydroxide hydrogel for cleaning, fully beat and stir, then suction filter, and repeat cleaning 6 times according to the cleaning method. Then wash the aluminum hydroxide hydrogel with 500 ml of absolute ethanol, stir well af...

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Abstract

The invention relates to the field of dehydrogenation catalysts, in particular to a dehydrogenation catalyst and a preparation method thereof and an application thereof. The dehydrogenation catalyst comprises a carrier and a main active metal component loaded on the carrier, wherein the main active metal component is a noble metal, and the carrier is a magnesium-aluminum composite carrier. The preparation method of the dehydrogenation catalyst comprises the following steps: (1) under the alkaline condition, an aluminum salt solution contacts with a precipitating agent, and an aluminum hydroxide hydrogel is obtained after aging and separation; the aluminum hydroxide hydrogel is cleaned by respectively using water and an alcohol solvent; and the aluminum hydroxide alcogel contacts with an alcohol solution of a magnesium salt under the ultrasonic condition, then the solvent is removed, and drying and roasting are performed to obtain the magnesium-aluminum composite carrier; and (2) the main active metal component is loaded on the magnesium-aluminum composite carrier. The dehydrogenation catalyst can achieve relatively good dehydrogenation activity, selectivity, stability and carbon deposition resistance under the condition of a very low noble metal loading capacity.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a dehydrogenation catalyst and its preparation method and application. 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, methacrylate, isoprene, tert-butylphenol, tert-butylamine, 1,4 -Various organic raw materials and fine chemicals such as 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 ). In recent years, with the development and utilization of isobutene downstream products, the demand for isobutene has been increasing year by year. The traditional isobutene production can no longer meet the huge demand for isobutene in the chemical industry. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/10B01J32/00B01J23/42B01J23/62B01J35/00B01J35/10B01J37/02B01J37/08B01J37/34C07C5/32C07C11/09
CPCB01J35/0066B01J37/0201B01J37/08B01J35/1019B01J35/1047B01J35/1042B01J23/626B01J23/58B01J21/10B01J37/343C07C5/322C07C2523/42C07C2523/62C07C11/09
Inventor 刘红梅薛琳张明森刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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