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Pt-load catalyst taking mesoporous carbon as carrier, as well as preparation method and usage thereof

A mesoporous carbon and catalyst technology, which is applied in the field of platinum-supported catalysts, can solve the problems that the electrolytic reduction method has not appeared in the industrialization report, and achieve the effects of reducing internal diffusion resistance, low use cost, high reactivity and selectivity

Inactive Publication Date: 2012-09-19
CHANGZHOU UNIV +1
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Problems solved by technology

Many shortcomings and limitations of the electrolytic reduction method make its industrialization report still not appear

Method used

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  • Pt-load catalyst taking mesoporous carbon as carrier, as well as preparation method and usage thereof

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preparation Embodiment 1

[0027] The active component monovalent platinum or divalent platinum in the hydrogenation catalyst is supported on the carrier mesoporous carbon by an impregnation method. Mesoporous carbon is pretreated before loading active components, and the pretreatment method is one of the following three treatment methods: (1) Add 10-30% H to mesoporous carbon 2 o 2 Soak in solution for 1-24 hours, then wash with distilled water, filter to remove hydrogen peroxide; (2) add mesoporous carbon to 1-6M hydrochloric acid or nitric acid solution and soak for 1-24 hours, then wash with distilled water, filter to remove acid; (3) Soak mesoporous carbon in 1-6M sodium hydroxide solution for 1-24 hours, then wash with distilled water, and filter to remove alkali. The active component platinum is loaded onto the carrier mesoporous carbon by the impregnation method: the carrier mesoporous carbon is impregnated with a solution containing monovalent platinum or divalent platinum, washed with distill...

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Abstract

The invention relates to a Pt-load catalyst taking mesoporous carbon as a carrier, which is characterized in that the mesoporous carbon is pretreated before Pt is loaded; the pretreatment method comprises one in the following steps of: (1) adding the mesoporous carbon into a 10-30% hydrogen dioxide solution, soaking for 1-24hours, washing and removing hydrogen peroxide; (2) adding the mesoporous carbon into a 1-6M hydrochloric acid or nitric acid solution, soaking for 1-24hours, washing and removing hydrochloric acid or nitric acid; and (3) adding the mesoporous carbon into a 1-6M sodium hydroxide solution, soaking for 1-24hours, washing and removing alkali, wherein the load quantity of Pt is 0.5-5%. The invention also relates to the application of the Pt-load catalyst in preparation of 2, 2'-dichloro hydroazobenzene (DHB) from ortho-nitrochlorobenzene through hydrogenation. The catalyst uses the mesoporous carbon as the carrier, so that the internal diffusion resistance can be better reduced, and the reaction speed is accelerated. The Pt-load catalyst is high in reaction activity and selectivity, and can be repeatedly used for more than eight times, so that the using cost of the catalyst is lowered.

Description

technical field [0001] The invention relates to a platinum-carrying catalyst with mesoporous carbon as a carrier, and relates to the preparation of medicine and organic pigment intermediate 2,2'-dichlorohydroazobenzene. Background technique [0002] 2,2′-Dichlorohydroazobenzene (DHB) has active chemical properties and is an important chemical intermediate widely used in pharmaceuticals, organic pigments and other industries. In the pharmaceutical industry, DHB can be used to prepare the antipyretic and analgesic drug phenylbutazone and its derivatives. In the organic pigment industry, DHB can be used to prepare 3,3′-dichlorobenzidine (DCB), and further synthesize a series of yellow and orange pigments, up to more than 20 varieties, accounting for 27% of the total output of all organic pigments about. Tetrahydrobenzidine, an important derivative of DCB, can be used to prepare a variety of organic pigments with extremely superior properties. [0003] The production methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J35/10C07C243/22C07C241/02
Inventor 李明时张遵亮鲁墨弘沈俭一杨思卫
Owner CHANGZHOU UNIV
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