Chromium-base catalyst for synthesizing alpha-tetralone by tetrahydronaphthalene and preparation method thereof

A technology of chromium-based catalyst and tetralone, which is applied in the preparation of organic compounds, carbon-based compounds, chemical instruments and methods, etc., can solve the problems of difficult recovery and recycling, low activity, etc., and achieve easy reuse, The effect of simple preparation and low cost

Inactive Publication Date: 2012-12-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to have the defect that the chromium-based catalyst of synthesizing α-tetralone by tetralin oxidation method has low activity, is difficult to rec

Method used

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  • Chromium-base catalyst for synthesizing alpha-tetralone by tetrahydronaphthalene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: with containing 0.1762 gram Cr (NO 3 ) 3 9H 2 O and 0.0320 g Co(NO 3 ) 2 ·6H 2 1 g of activated alumina with a particle size of 0.35 mm was impregnated with an equal volume of O solution at room temperature for 12 h. After the impregnation, dry at 180°C for 1 hour and bake at 300°C for 1 hour in an air atmosphere to obtain a cobalt-modified chromium-based catalyst, which is designated as Cat-A. The specific composition is shown in Table 1.

Embodiment 2

[0017] Embodiment 2: with containing 0.5238 gram Cr (NO 3 ) 3 9H 2 O and 0.0351 g Cu(NO 3 ) 2 ·3H 2 1 g of activated alumina with a particle size of 0.50 mm was impregnated with an equal volume of O solution at room temperature for 12 h. After impregnation, dry at 120°C for 1 hour and bake at 300°C for 1 hour in an air atmosphere to obtain a copper-modified chromium-based catalyst, which is designated as Cat-B. The specific composition is shown in Table 1.

Embodiment 3

[0018] Embodiment 3: with containing 0.7974 gram Cr (NO 3 ) 3 9H 2 O and 0.0722 g Ce(NO 3 ) 3 ·6H 2 Immerse 1 gram of activated alumina with a particle size of 0.70 mm in an equal volume of O solution at room temperature for 24 h. After impregnation, dry at 80°C for 4 h and bake at 500°C for 4 h in an air atmosphere to obtain a cerium-modified chromium-based catalyst, which is recorded as Cat-C. The specific composition is shown in Table 1.

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Abstract

The invention discloses a chromium-base catalyst for synthesizing alpha-tetralone by tetrahydronaphthalene and a preparation method of the chromium-base catalyst, belonging to the technical field of catalyst preparation. The catalyst provided by the invention adopts activated aluminium oxide as carrier; Cr oxide is used as main active component of the chromium-base catalyst; the mass percentage of the main active component is 2.0-4.0%; the oxide of any one of Co, Mn, Cu, Ni, Fe, Zr and Ce is used as auxiliary active component of the chromium-base catalyst; the mass percentage of the auxiliary active component is 0.5-3.5%. The chromium-base catalyst is prepared by the co-dipping method. The chromium-base catalyst has the advantages of low cost, catalytic activity, excellent selectivity and environment friendliness. For example, when the conversion rate of the tetrahydronaphthalene is 48.2% during the catalytic oxidization reaction on the conditions of 120 DEG C of temperature, 8 hours of reaction time and normal pressure, the selectivity of the alpha-tetralone and alpha-tetralol is 84.6% and 11.9% respectively; and the catalytic performance of the catalyst is not changed essentially after circular reaction for four times.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a chromium-based catalyst for selective oxidation of tetralin to synthesize alpha-tetralone and a preparation method thereof. Background technique [0002] α-tetralone is a very important biologically active organic intermediate, mainly used in the synthesis of methylnaphthol by dehydrogenation, and also used in the antidepressant sertraline and the contraceptive 18-methyl norethindrone and Synthesis of drugs and chemicals such as the insecticide menaphthylamine. It is estimated that the annual worldwide demand for α-tetralone is greater than 300 million US dollars. At present, there are two industrial synthesis routes of α-tetralone: ​​(1) Friedel-Crafts reaction method. Using benzene and γ-butyrolactone as raw materials, it can be synthesized by Friedel-Crafts acylation reaction; or it can be synthesized by using benzene and succinic anhydride as raw ...

Claims

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Application Information

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IPC IPC(8): B01J23/86B01J23/26B01J23/34C07C49/67C07C45/36
Inventor 许立信李培杰徐艳艳刘巍巍崔平王知彩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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