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Benzene hydrogenation catalyst as well as preparation method and application thereof

A catalyst, a technology for benzene hydrogenation, which is applied in the fields of hydrogenation to hydrocarbons, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem that the selectivity of cyclohexene needs to be further improved, and achieve high selectivity of cyclohexene and high catalytic activity. Effect

Active Publication Date: 2012-07-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above supported catalysts still need to be further improved in terms of the conversion rate of benzene and the selectivity of cyclohexene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Vector preparation:

[0047] At room temperature, 1.10 g of cetyltrimethylammonium bromide was dissolved in 25 mL of deionized water to prepare a solution; 0.2100 g of zirconium oxychloride was dissolved in 15 mL of deionized water to prepare a solution; Add zirconium oxychloride solution and 5.36 g of ethyl orthosilicate dropwise to the hexaalkyltrimethylammonium bromide solution to form a mixed solution; after the dropwise addition, continue to stir for 10 minutes; add to it under vigorous stirring at 50°C Add dropwise ammonia water with a mass concentration of 25%, adjust the pH of the solution to 10, and react at a constant temperature for 1 hour; transfer the reaction mixture to a stainless steel hydrothermal synthesis kettle with a polytetrafluoroethylene lining, and crystallize at 180°C for 12 hours; Take out the reaction kettle, after cooling to room temperature, the crystallization sample in the kettle is suction filtered and washed with deionized water to be ...

Embodiment 2

[0053] (1) Vector preparation:

[0054] Prepare carrier 5% ZrO according to step (1) in Example 1 2 -MCM-41.

[0055] (2) Catalyst preparation:

[0056] 0.1348 g RuCl 3 ·XH 2 O (purity is 99.9%, ruthenium content is 37.0%) and 0.1736 g Ce(NO 3 ) 3 ·6H 2 O is dissolved in 10mL deionized water to make a mixed solution; add 0.50 g carrier 5% ZrO to the above mixed solution at 30℃ 2 -MCM-41, stir and immerse for 30min; then add 30mL of ammonia water with a mass concentration of 0.1% to the immersion solution dropwise, continue to stir for 30min and then stand for 30min, filter to obtain a black precipitate; wash the black precipitate with deionized water It becomes neutral, washed with a small amount of absolute ethanol, and dried at 100°C for 12 hours to obtain the catalyst precursor; the catalyst precursor is 5% by volume H 2 / N 2 Reductive activation in the mixed atmosphere, the mixed gas flow rate is 40mL / min, the reduction temperature is 300°C, the heating rate is 2°C / min, and the r...

Embodiment 3

[0060] (1) Vector preparation:

[0061] Prepare carrier 5% ZrO according to step (1) in Example 1 2 -MCM-41.

[0062] (2) Catalyst preparation:

[0063] 0.1348 g RuCl 3 ·XH 2 O (purity is 99.9%, ruthenium content is 37.0%) and 0.0150 g Zn(NO 3 ) 2 ·6H 2 O is dissolved in 10mL deionized water to make a mixed solution; add 0.50 g carrier 5% ZrO to the above mixed solution at 30℃ 2 -MCM-41, stir and immerse for 30min; then add 30mL of ammonia water with a mass concentration of 0.1% to the immersion solution dropwise, continue to stir for 30min and then stand for 30min, filter to obtain a black precipitate; wash the black precipitate with deionized water It becomes neutral, washed with a small amount of absolute ethanol, and dried at 100°C for 12 hours to obtain the catalyst precursor; the catalyst precursor is 5% by volume H 2 / N 2 Reductive activation in the mixed atmosphere, the mixed gas flow rate is 40mL / min, the reduction temperature is 300°C, the heating rate is 2°C / min, and the r...

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Abstract

The invention relates to a benzene hydrogenation catalyst as well as a preparation method and application of the benzene hydrogenation catalyst. The catalyst consists of an active component Ru and adjuvants, wherein the active component Ru is loaded on the catalyst by a carrier; the adjuvants are one or two of La, Ce, Fe, Zn, Cu and B, and the carrier is a mesoporous molecular sieve MCM-41 modified by one or two of ZrO2, ZnO and CuO. The invention also provides a method for preparing cyclohexene and cyclohexane by benzene hydrogenation catalyzed by the catalyst. The catalyst provided by the invention can be prepared by a dipping sedimentation method or a chemical reduction method and has a higher catalytic activity and cyclohexene selectivity.

Description

Technical field [0001] The invention belongs to the technical field of chemical catalysts, and specifically relates to a method for preparing a benzene hydrogenation catalyst and a method for preparing cyclohexene and cyclohexane by hydrogenating benzene using the catalyst. Background technique [0002] Cyclohexene in benzene hydrogenation products is an important organic intermediate. Because of its active double bond, it is widely used in the production of medicines, pesticides, agrochemicals, feed additives, polyesters and other fine chemical products. , Especially in nylon 6, nylon 66 and other polyamide fiber synthesis process has huge economic value and broad market prospects. The traditional production methods of cyclohexene, including cyclohexanol dehydration, halogenated cyclohexane dehydrohalogenation, cyclohexane dehydrogenation, etc., have the disadvantages of complex process flow, large energy consumption, low yield, high cost, etc., which cannot meet modern requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J29/76C07C13/18C07C13/20C07C5/10C07C5/11
CPCY02P20/52
Inventor 罗和安刘平乐廖红光张晶
Owner XIANGTAN UNIV
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