A kind of method that nitrogen-doped graphene catalyzes ethanol decomposition to prepare acetaldehyde

Abstract

A method for preparing acetaldehyde by catalyzing ethanol decomposition with nitrogen-doped graphene, relates to a method for preparing acetaldehyde, comprising the following steps: putting the nitrogen-doped graphene catalyst into a reactor, and inert gas at a flow rate of 5-30ml / min Through the process, ethanol is fed at a flow rate of 0.005-0.100ml / min, and at a reaction temperature of 100°C-600°C, the ethanol is catalyzed to decompose to obtain acetaldehyde, wherein the conversion rate of acetaldehyde is 10%-40%. In the process of preparing acetaldehyde in the present invention, the selectivity is 100%, the preparation process of the nitrogen-doped graphene is simple, there is no environmental pollution, the cost is greatly reduced, and the industrial application value is relatively large. The method has mild operating conditions, more energy saving than the traditional preparation of acetaldehyde, milder catalyst, no environmental pollution, reasonable yield and easy industrialization. Starting from these angles, the present invention provides a new catalyst for the production of acetaldehyde, and at the same time expands the application of graphene in catalysis.

Description

technical field [0001] The invention relates to a method for preparing acetaldehyde, in particular to a method for preparing acetaldehyde by catalyzing ethanol decomposition of nitrogen-doped graphene. Background technique [0002] Acetaldehyde is an important industrial intermediate and an important raw material for the manufacture of acetic acid, ethyl acetate, ketene, ethyl acetate, crotonaldehyde, pentaerythritol, pyridine and other important chemicals, and has very high industrial application value . At present, the commonly used methods for the preparation of acetaldehyde in my country are ethylene oxidation and ethanol oxidation, in which the raw material of ethylene in the ethylene oxidation method comes from the dry gas produced in the catalytic cracking unit. There are many problems with the above two methods: [0003] 1. The catalyst used in the ethylene oxidation method is a platinum-based catalyst, which is relatively expensive. The reaction needs to be carrie...

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Problems solved by technology

[0003] 1. The catalyst used in the ethylene oxidation method is a platinum-based catalyst, which is relatively expensive. The reaction needs to be carried out under a relatively high pressure. After the reaction is completed, the by-products need to be removed by distillation, and the investment is relatively large.

[0004] 2. The ethanol oxidation method uses a silver-based catalyst, which is relatively expensive, has side reactions, relatively high reaction temperature, relatively high requirements for equipment, and relatively large investment

[0005] At present, there is still a more reasonable method for the preparation of acetaldehyde, which is the dehydrogenation of ethanol, and the catalyst used is a copper-based catalyst, but in the preparation of the catalyst, additives and carriers need to be added, and the preparation process is complicated.