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Catalyst for preparing cyclohexene by benzene selective hydrogenation, its preparing method and use

A catalyst and cyclohexene technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydrogenation hydrocarbon production, etc., can solve the problem of low benzene conversion activity and achieve high cyclohexene Selectivity, effect of high benzene conversion activity

Active Publication Date: 2007-06-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is used for the hydrogenation of benzene to cyclohexene, which has high selectivity and yield, but the conversion activity of benzene is not high

Method used

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  • Catalyst for preparing cyclohexene by benzene selective hydrogenation, its preparing method and use
  • Catalyst for preparing cyclohexene by benzene selective hydrogenation, its preparing method and use

Examples

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preparation example Construction

[0015] The preparation method of the catalyst provided by the invention comprises mixing soluble compound solutions containing Ru and M, and then mixing with zirconia containing yttrium oxide, adding an alkaline aqueous solution of sodium borohydride under stirring to fully react, and isolating a solid product, Washing with deionized water until the solution is neutral, washing with ethanol, and then drying, the M is selected from Co, Fe, Ni or Cu.

[0016] Catalyst of the present invention adopts chemical reducing agent to prepare, and reducing agent is preferably NaBH 4 . Y 2 o 3 Mix the mixed solution of zirconia containing ruthenium and the water-soluble compound containing additive M, stir for 1 to 5 hours to disperse the solid evenly, and then add NaBH dropwise to it 4 The alkaline aqueous solution fully reacts, the active components and additives are reduced to a metal state, and the stirring is stopped. Stand still at 20-30°C for 4-12 hours, use centrifugation to s...

example 1

[0024] Preparation of the catalyst of the present invention.

[0025] (1) Preparation containing Y 2 o 3 of zirconia.

[0026] Dissolve 50 g of zirconium oxychloride and 1.37 g of yttrium nitrate in 1000 ml of deionized water, raise the temperature to 80° C. and stir for 2 hours, and quickly add 100 ml of NaOH solution with a concentration of 25% by mass to react for 4 hours. The stirring was stopped, and the resultant was aged at 25° C. for 24 hours. Filter, wash the solid with absolute ethanol 3 times, dry under reduced pressure at 35°C for 12 hours, and roast at 500°C for 4 hours to obtain a powder containing 5.0 mass% Y 2 o 3 ZrO 2 carrier.

[0027] (2) Preparation of catalyst

[0028] Take 20 grams containing 5.0 mass% Y 2 o 3 The zirconia support was put into a beaker, and 7.03 g of RuCl 3 ·3H 2 O (purity 99.99%, ruthenium content 37±0.4%), 0.73 g CoCl 2 ·6H 2 O mixed with 47 ml of deionized water was added to the beaker and stirred for 1 hour. Add 3.91 g o...

example 2

[0030] Containing 5.0% by mass Y 2 o 3 20 grams of zirconia powder, prepare catalyst B by the method of example 1 (2), except that 7.03 grams of RuCl 3 ·3H 2 O, 0.64 g FeCl 2 4H 2O and 80 ml of deionized water were mixed and added to the beaker, stirred for 1 hour, and then added dropwise by 3.92 g of NaBH 4 , 0.8 gram of NaOH and 40 milliliters of deionized water were reduced, and the solid obtained was washed with water and alcohol, and dried to obtain catalyst B, whose composition is shown in Table 1.

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Abstract

The present invention relates to a catalyst for benzene selective hydrogenation to prepare cyclohexene. Said catalyst includes carrier and following active components: (by carrier content as reference) Ru 1-20 mss%, M 0.1-3.0 mass%. B 0.1-6.0 mass%, the described carrier is formed from 2-20 mss% of yttrium oxide and 80-98% of zirconium oxide, and M is selected from Co, Fe, Ni or Cu. Said catalyst is prepared by adopting chemical reducing agent, and has higher cyclohexene selectivity.

Description

technical field [0001] The invention relates to a catalyst for preparing cyclohexene by selective hydrogenation of benzene, a preparation method and application. Specifically, it is a boron-containing catalyst for preparing cyclohexene by selective hydrogenation of benzene prepared by chemical reducing agent and a preparation method, and a method for preparing cyclohexene by using the catalyst for selective hydrogenation of benzene. Background technique [0002] Cyclohexene is widely used in organic chemical raw materials because of its active double bond. In recent years, cyclohexene can be used as an intermediate raw material in the production process of caprolactam and adipic acid. Cyclohexene is prepared by selective hydrogenation of benzene, and cyclohexanol is prepared by hydration of cyclohexene, and cyclohexanone and adipic acid are obtained by oxidation of cyclohexanol. The above process shortens the production process of caprolactam and adipic acid, saves product...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C5/11C07C13/20
CPCY02P20/52
Inventor 陈志祥吴敏孙作霖谷婉华
Owner CHINA PETROLEUM & CHEM CORP
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