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Method for preparing benzaldehyde by selective catalytic oxidation of benzyl alcohol in low temperature gas phase with double metal modified SBA-15 catalyst

A technology for catalytic oxidation and benzyl alcohol, applied in the direction of molecular sieve catalysts, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of low temperature, high selectivity, high activity, temperature tolerance, etc., and achieve excellent catalytic performance, Simple synthesis process and high activity effect

Inactive Publication Date: 2015-07-29
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] The present invention aims to solve the problem that the existing catalysts used for gas-phase selective catalytic oxidation of alcohols to prepare corresponding aldehydes or ketones cannot take into account low temperature, high selectivity, high activity, better temperature tolerance and longer service life, and provides Method for preparing benzaldehyde by selective catalytic oxidation of benzyl alcohol in low temperature gas phase with double metal modified SBA-15 catalyst

Method used

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specific Embodiment approach 1

[0036] Specific embodiment 1: The molecular formula of the bimetallic modified SBA-15 catalyst in this embodiment is xCu-yAg / SBA-15, wherein x is the mass percentage of metal Cu in the catalyst, and x is 0.01% to 20% %; said y is the mass percentage of metal Ag in the catalyst, and y is 1% to 30%.

[0037] The bimetallic modified SBA-15 catalyst of this embodiment is prepared by an impregnation method, and the catalyst introduces active components onto the surface of the SBA-15 carrier.

[0038] The catalyst described in this embodiment has high activity, strong selectivity, excellent catalytic performance, high product purity, and reduces the cost of separation and purification; and the catalyst has good temperature tolerance, and can be used in a wide temperature range (220 ℃~400℃), has stable catalytic performance, stable structure in gas phase continuous reaction, long service life and easy activation and regeneration.

specific Embodiment approach 2

[0039] Specific embodiment two: the preparation method of bimetallic modified SBA-15 catalyst of the present embodiment, carries out according to the following steps:

[0040] The SBA-15 support was impregnated with Cu 2+ / Ag + mixed in the aqueous solution, then magnetically stirred at a temperature of 20°C to 100°C and a speed of 60 rpm to 1000 rpm for 2h to 24h, filtered to obtain a solid catalyst, and then placed the obtained solid catalyst at a temperature of Dry in an oven at 50°C to 200°C for 1h to 48h, and then place it at a temperature of 400°C to 700°C for 1h to 24h to obtain a bimetallic modified SBA-15 catalyst xCu-yAg / SBA-15; x is the mass percentage of metal Cu in the catalyst, and x is 0.01% to 20%; the described y is the mass percentage of metal Ag in the catalyst, and y is 1% to 30%; the Cu 2+ / Ag + The cation in the mixed aqueous solution is Cu 2+ and Ag + , and the Cu 2+ / Ag + Cu in the mixed aqueous solution 2+ The concentration is 0.001mol / L~5mol / L...

specific Embodiment approach 3

[0045] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the Cu 2+ / Ag + The anion in the mixed aqueous solution is or . Others are the same as in the second embodiment.

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Abstract

The invention discloses a thermometal modified SBA-15 catalyst, a preparation method and application thereof, relates to the thermometal modified catalyst, the preparation method and application thereof, and aims to solve the problems that the existing catalyst for preparing corresponding aldehyde or ketone by adopting gaseous phase selectivity catalytic oxidation of alcohol does not combine the advantages of low temperature, high selectivity, high activity, better thermal tolerance and longer service life and is complicated in preparation process. The molecular formula of the thermometal modified SBA-15 catalyst is xCu-yAg / SBA-15, wherein x and y refer to the mass percents of Cu and Ag in the catalyst respectively. The preparation method comprises the following steps: dipping the SBA-15 carrier into the mixed Cu<2+> / Ag<+> aqueous solution, heating, magnetic stirring, drying and roasting to obtain the thermometal modified SBA-15 catalyst. The thermometal modified SBA-15 catalyst disclosed by the invention is used for preparing corresponding aldehyde or ketone in a catalysis manner by adopting low temperature gaseous phase selectivity catalytic oxidation of alcohol.

Description

technical field [0001] The invention relates to a method for preparing benzaldehyde from benzyl alcohol. Background technique [0002] Pure silicon SBA-15 mesoporous molecular sieve has a long-range ordered one-dimensional pore structure, and the mesopore size can be adjusted in the range of 4.6nm to 30nm. Silanol, easy to modify. At the same time, using the confinement effect of its regular nanospace to prepare nano active phases is one of the effective methods for preparing functional nanomaterials, so it is widely used in the catalysis and adsorption industries. [0003] Due to the interaction between metals and active components and supports, bimetallic modified catalysts often produce some effects better than those of single metals. [0004] In recent years, bimetallic modified supported catalysts doped with Cu as the second metal have shown excellent catalytic performance in many reactions. [0005] Li (Applied Catalysis A: General, 2012, 433–434, 146–151) et al. 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/035C07C45/38C07C45/39C07C47/54C07C49/786C07C49/403C07C49/395C07C47/02C07C47/127C07C47/232
Inventor 贾丽华马良郭祥峰
Owner QIQIHAR UNIVERSITY
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