Method for preparing benzaldehyde by catalytically oxidizing phenylcarbinol through Pt/BiOCl-metal oxide serving as catalyst

Abstract

The invention discloses a method for preparing benzaldehyde by catalytically oxidizing phenylcarbinol through Pt/BiOCl-metal oxide serving as a catalyst. The method comprises the following steps: by taking a noble metal Pt/BiOCl-metal oxide compound system as the catalyst, dispersing phenylcarbinol and the catalyst into water, and continuously stirring under a relatively low-temperature dark condition for 3 to 10 hours, wherein the generation selectivity of the benzaldehyde can be 99 percent or above, and the yield of the benzaldehyde is retained within a range of 80 to 100 percent according to different types of carriers. The method has the following active effects that 1, the reaction can be carried out at relatively low temperature, such as room temperature of 25 DEG C; 2, low-cost air is used as an oxidant, so that the problem of environmental pollution caused by the fact that a high-cost metal such as chromium and manganese is used as the oxidant is solved; 3, no alkaline substances serving as an auxiliary catalyst are added into a reaction system; 4, basically no side effect is caused in a reaction process, and the generation selectivity of the benzaldehyde is retained at 99 percent or above; 5, equipment devices for reaction and an operation process are simple.

Description

technical field [0001] The invention belongs to the field of nanometer material preparation and green catalytic oxidation of organic matter, and specifically relates to a method for improving the efficiency of producing benzaldehyde by selective oxidation of benzyl alcohol at room temperature by using a prepared novel catalyst. Background technique [0002] Benzaldehyde is a class of organic chemical intermediates with extremely important application value in fine chemical industries such as medicine, plastics, and flavors. Therefore, the preparation of benzaldehyde is a very important organic reaction. However, the industrial production of benzaldehyde at home and abroad usually adopts benzyl chloride hydrolysis method and toluene chlorination hydrolysis method. The application of formaldehyde has caused serious environmental pollution. Therefore, research and development of economical "green" catalytic synthesis of benzaldehyde has become a hot spot in this field. At pre...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low efficiency in the process of producing benzaldehyde by catalytic oxidation of benzyl alcohol, aiming to provide a novel catalyst to realize the high-efficiency production of benzaldehyde from benzyl alcohol under green conditions at room temperature. Bismuth oxychloride (BiOCl) generated at room temperature, under the condition of non-alkali water phase at room temperature, using air as an oxidant to improve the efficiency of benzyl alcohol oxidation to benzaldehyde, the reaction system neither involves chromium, manganese and other toxic substances as oxidants, nor It involves toluene, chloroform and other organic reagents and alkaline substances as cocatalysts, which effectively reduces environmental pollution. It is a completely green way of catalytic conversion of benzyl alcohol to benzaldehyde, while maintaining the selectivity of benzaldehyde formation higher than 99%

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