Carbon nanotube catalyst for preparation of acetaldehyde by selective oxidation of ethanol and application thereof

Abstract

The invention discloses a carbon nanotube catalyst for preparation of acetaldehyde by selective oxidation of ethanol and an application thereof, and belongs to the technical field of applications of catalysts to selective oxidation of gas phase alcohol. A carbon nanotube material which is treated by high temperature is used as the catalyst for a reaction for preparing acetaldehyde by selective oxidation of ethanol, ethanol is converted into acetaldehyde with catalysis in a condition with oxygen, and the usage temperature of the catalyst is 200-350 DEG C; the conditions of the catalytic reaction are as follows: air speed is 10000-50000ml / g.h, the volume concentration of ethanol is 0.1-2%, and volume ratio of ethanol to oxygen is 0.1-10; the catalyst has stable performance, carbon deposition is not easy to happen in a reaction process, the treatment conditions of the catalyst are simple, and industrial application is easy to realize.

Description

technical field [0001] The invention relates to the technical field of catalysts for the selective oxidation of gaseous alcohols, in particular to a carbon nanotube catalyst used for the selective oxidation of ethanol to prepare acetaldehyde and its application. Background technique [0002] Acetaldehyde is an oxygen-containing compound with a carbonyl group. Due to the electronegative nature of the oxygen atom, it is easily polarized into a polar end group structure, thereby forming a positive carbon and a semi-polarized bonded oxygen. The carbonyl group in the active end group structure can undergo many addition, cyclization and polymerization reactions, while the oxygen atom of the semi-polar bond is non-reactive, and only forms an unstable complex with a strong acid or a complex. As an important aliphatic compound, acetaldehyde is used in the manufacture of acetic acid, peracetic acid, acetic anhydride, ketone acetate, ethyl acetate, crotonaldehyde, n-butanol, 2-ethylhex...

AI Technical Summary

Problems solved by technology

In industry, silver screen or fluffy crystalline silver catalyst is commonly used to prepare acetaldehyde by ethanol oxidation method. Ethanol vapor is mixed with air, and passes through the catalyst at 0.3Mpa, and the reaction temperature is 450-550°C. With the different amount of air, the reaction temperature reaches A certain value, at this time, the heat released by the oxidation reaction just offsets the heat required by the dehydrogenation reaction. With the difference of reaction temperature, the single-pass conversion rate of ethanol reaches 30-50%, and the selectivity is 85-95%. The biggest disadvantage of this method is that the catalyst Expensive and high reaction temperature

In recent years, researchers have conducted a lot of research on the catalytic process of ethanol oxidation, most of which focus on metal or metal oxide catalysts. Although a higher conversion rate can be obtained at a lower temperature, the selectivity is poor, and the catalyst relatively poor stability