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Catalyst for catalyzing oxidation of benzyl compound to prepare carbonyl compound and preparation method and application of catalyst

A carbonyl compound, catalyzed benzyl technology, applied in the preparation of carbonyl compounds, the preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve the problems of catalytic activity, low specific surface area of ​​transition metal oxides, etc., to achieve catalyst performance Excellent, high selectivity of reaction products, simple reaction process

Active Publication Date: 2020-02-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​transition metal oxides prepared by precipitation method, sol-gel method and other methods is low, which affects their catalytic activity. It is of great significance to prepare composite metal oxides with high specific surface area for oxidation of benzyl compounds.

Method used

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  • Catalyst for catalyzing oxidation of benzyl compound to prepare carbonyl compound and preparation method and application of catalyst
  • Catalyst for catalyzing oxidation of benzyl compound to prepare carbonyl compound and preparation method and application of catalyst
  • Catalyst for catalyzing oxidation of benzyl compound to prepare carbonyl compound and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare an aqueous solution of 60wt% cobalt nitrate, slowly add the silicon-based mesoporous molecular sieve hard template KIT-6 into the precursor solution at 90°C, the mass ratio of soluble salt to hard template is 1:2, keep stirring during the process, Continue to stir for 24 hours after adding the template agent, then stir the suspension at 90°C, evaporate the solvent to dryness, dry the obtained product at 150°C for 24 hours, and calcinate at 800°C for 10 hours, and continue to add the same amount of solid as before The aqueous solution of 60wt% cobalt nitrate was repeatedly impregnated under the same conditions as before, the solvent was evaporated, dried and calcined to obtain a silicon-based mesoporous molecular sieve filled with metal oxides. Then use 5molL -1 The sodium hydroxide aqueous solution was removed at 90°C to remove the silicon-based mesoporous molecular sieve, then filtered, washed with deionized water until the filtrate was neutral, and dried at 15...

Embodiment 2

[0037] Prepare a 5wt% ethanol solution of copper nitrate, slowly add the silicon-based mesoporous molecular sieve hard template KIT-6 into the precursor solution at 20°C, the mass ratio of soluble salt to hard template is 1:0.2, and keep stirring during the process After the addition, continue to stir at 20°C for 2h, then stir the suspension at 50°C, evaporate the solvent to dryness, dry the obtained product at 50°C for 2h, and calcinate at 300°C for 1h, and continue to add the obtained solid with The same amount of 5wt% copper nitrate ethanol solution was repeatedly impregnated under the same conditions as before, evaporated to dryness, dried and calcined to obtain a silicon-based mesoporous molecular sieve filled with metal oxides. Then use 0.2molL -1 The sodium hydroxide aqueous solution was removed at 30°C to remove the silicon-based mesoporous molecular sieve, filtered, washed with deionized water until the filtrate was neutral, and dried at 50°C for 2 hours to obtain a c...

Embodiment 3

[0042] Prepare 30wt% ethanol solution of cobalt nitrate and copper nitrate, the molar ratio of cobalt to copper is 1:1, slowly add the silicon-based mesoporous molecular sieve hard template KIT-6 into the precursor solution at 55°C, the soluble salt and The mass ratio of the hard template agent is 1:1, keep stirring during the process, continue to stir at 55°C for 12h after the addition, then stir the suspension at 70°C, evaporate the solvent to dryness, and dry the obtained product at 100°C for 12h , calcined at 550°C for 6h, and the obtained solid was continuously added with the same amount of ethanol solution of 30wt% cobalt nitrate and copper nitrate as before, the molar ratio of cobalt and copper was 1:1, and the impregnation was repeated under the same conditions as before, The solvent is evaporated to dryness, dried and calcined to obtain a silicon-based mesoporous molecular sieve filled with metal oxides. Then use 2.5molL -1 The sodium hydroxide aqueous solution was r...

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Abstract

The invention discloses a catalyst for catalyzing oxidation of a benzyl compound to prepare a carbonyl compound and a preparation method and application of the catalyst and belongs to the technical field of catalysts. The catalyst comprises an active component of cobalt tetroxide, a single metal oxide of copper oxide or a composite oxide of the cobalt tetroxide and the copper oxide. According to the preparation method, a silicon-based mesoporous molecular sieve hard template agent is used, a metal oxide is filled into pores of a molecular sieve, and the hard template agent is removed at a lowtemperature, so that a metal oxide with a large specific surface area is prepared. Compared with metal oxides prepared by using a coprecipitation method, a sol-gel method and the like, the metal oxideprepared by using the method has a remarkably increased specific surface area. The prepared metal oxide with the large specific surface area can be applied to a liquid-phase oxidation reaction of thebenzyl compound at a low temperature. The catalyst has the advantages of being low in cost, high in benzyl compound conversion rate, high in selectivity of corresponding carbonyl compounds, mild in reaction condition, good in stability and easy to separate.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for catalyzing the oxidation of benzyl compounds to prepare carbonyl compounds, as well as its preparation method and application. Background technique [0002] In recent years, the oxidation conversion of inexpensive and readily available organic compounds into high value-added products has received increasing attention. Among them, the benzyl sp 3 The oxidation of hybridized C-H bonds to prepare corresponding carbonyl compounds is an important class of reactions, and its products are widely used in pesticides, dyes, pharmaceuticals and other industries. [0003] About Benzylsp 3 Oxidation of hybrid C-H bonds often uses stoichiometric solid or liquid oxidants, such as high-valent chromium oxidants, sodium periodate, potassium permanganate, tert-butyl hydroperoxide, etc., but these oxidants are not environmentally friendly. At the same time expensive. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C07B41/06C07B41/08C07C45/36C07C51/265C07C201/12C07C49/675C07C49/67C07C49/786C07C47/54C07C63/06C07C63/16C07C63/24C07C63/26C07C63/307C07C49/78C07C49/76C07C49/807C07C49/788C07C49/697C07C205/45
CPCB01J29/0333B01J2229/186C07B41/06C07B41/08C07C45/36C07C51/265C07C201/12C07C2602/08C07C2602/10C07C2603/18C07C49/675C07C49/67C07C49/786C07C47/54C07C63/06C07C63/16C07C63/24C07C63/26C07C63/307C07C49/78C07C49/76C07C49/807C07C49/788C07C49/697C07C205/45
Inventor 肖福魁赵宁雒京李枫王峰李磊
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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