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Catalyst in use for hydrogenation reaction of benzene selection, preparartion method and application

A technology for selective hydrogenation and catalysts, applied in the fields of hydrogenation to hydrocarbons, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high cost and high content of precious metal ruthenium, and achieve high activity and selective effect

Inactive Publication Date: 2006-07-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Asahi Kasei [US 4,734,536] has reported a typical ruthenium black catalyst, which is obtained by precipitating ruthenium trichloride with sodium hydroxide; the conversion rate of benzene can reach 60%, and the selectivity is 79.6%; but the precious metal ruthenium content of the catalyst Very high, expensive, TOF(H 2 ) is only 292h -1

Method used

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  • Catalyst in use for hydrogenation reaction of benzene selection, preparartion method and application
  • Catalyst in use for hydrogenation reaction of benzene selection, preparartion method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of solution A: 8.0g surfactant nonylphenol polyoxyethylene ether-7 (NP-7), 0.86g containing 14.55wt% ruthenium trichloride, in 50mL cyclohexane, in 500mL four-hole round bottom Mix in a flask at 30°C under stirring to obtain translucent solution A.

[0036] Preparation of solution B: Add 8.0 g of surfactant NP-7 and 2.14 g of 6.54 wt % potassium borohydride aqueous solution into 30 mL of cyclohexane, control the temperature at 30° C., and stir to obtain translucent solution B.

[0037] Catalyst preparation: control the temperature at 30°C, under the protection of nitrogen, add solution B dropwise to solution A under stirring. After the dropwise addition, add 2.68g ethyl orthosilicate successively, 10mL concentration is the ammonia water of 12.5wt%, overnight, add 50mL acetone after the reaction finishes, centrifuge, after the absolute ethanol and water wash, the catalyst number that obtains is 1.

[0038] Catalyst activation: take the above catalyst, add 1...

Embodiment 2

[0043]Add 8.0g of surfactant NP-7 and 2.15g of 14.80wt% hydrazine hydrate solution into 30mL of cyclohexane, control the temperature at 30°C, and stir to obtain translucent solution B. The rest of the preparation steps are the same as in Example 1. Catalyst number 2 was obtained. The reaction results are shown in Table 1.

Embodiment 3

[0045] Add 8.0g of surfactant NP-7 and 2.43g of 5.62wt% formaldehyde aqueous solution to 30mL of cyclohexane, control the temperature at 30°C, and stir to obtain translucent solution B. The rest of the preparation steps are the same as in Example 1, and the number of the obtained catalyst is 3. The reaction results are shown in Table 1.

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Abstract

The invention provides a ruthenium catalyst for benzene selective hydrogenation reaction and its preparation method. It is characterized by that: (1). the nucleation and growth processes of ruthenium nano particle can be controlled in the nano reactor composed of water nucleus enclosed with surfactant and implemented; and (2). the porous inorganic protective layer is formed by utilizing in-situ hydrolysis of ethyl metasilicate in nano reactor system containing ruthenium nano particles. The ruthenium content is said catalyst is 7-15 wt%, said catalyst can be used for benzene selective hydrogenation reaction, when the benzene conversion rate is 40%, cyclohexene selectivity is 72-75%, TOF(H2) can be up to above 3560h-1, and its yield can be up to above 40%.

Description

technical field [0001] The invention relates to a catalyst for selective hydrogenation of benzene. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. [0003] The present invention also relates to the application of the catalyst in the selective hydrogenation of benzene to prepare cyclohexene. Background technique [0004] Cyclohexene is an important organic chemical raw material, which can be used in synthetic resins, plastics, fibers, rubber, detergents, dyes, pesticides, explosives and medicines; such as L-lysine, cyclohexene oxide, etc. value product. Traditional methods such as cyclohexanol dehydration, halocyclohexane dehalogenation, Birch reduction, etc. have high costs; the development of a new process for the preparation of cyclohexene by selective hydrogenation of cheap benzene as raw material reduces the production cost of cyclohexene , broaden its scope of application, so that it can be used in the preparation o...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/60B01J23/656B01J23/89C07C5/11
CPCY02P20/52
Inventor 徐杰宁剑波刘菁路芳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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