Cu-ZnO/SiO2 aerogel bimetallic catalyst, as well as preparation method and application thereof

Abstract

The invention provides a Cu-ZnO / SiO2 aerogel bimetallic catalyst, as well as a preparation method and application of the Cu-ZnO / SiO2 aerogel bimetallic catalyst. The preparation method comprises the following steps: weighing a SiO2 aerogel, adding the SiO2 aerogel into deionized water, stirring evenly at the constant temperature, dropwise adding a mixed aqueous solution of Cu(NO3)2.3H2O and Zn(NO3)2.6H2O; dropwise adding a Na2CO3 solution, stabilizing the pH value to 7.3-7.7; filtering, washing with the deionized water, drying overnight, roasting, tableting a sample, screening, and preparing a catalyst parent; conducting pretreatment of reduction activation on the catalyst parent in mixed gases of nitrogen and hydrogen, raising the temperature to 240 DEG C through a program at the speed of 2 DEG C per minute at the pressure of 0.1 MPa, wherein the volume fraction of H2 is 10%; raising the temperature to 300 DEG C through a program at the speed of 1.0 DEG C per minute, regulating the volume fraction of H2 to 30%, reducing for 6 hours at the constant temperature of 300 DEG C to obtain the reduced catalyst, namely the Cu-ZnO / SiO2 aerogel bimetallic catalyst. The distinguishing characteristic of the Cu-ZnO / SiO2 aerogel bimetallic catalyst and the preparation method is that the preparation process of the adopted SiO2 aerogel bimetallic catalyst is simple, and the SiO2 aerogel bimetallic catalyst is excellent in catalytic activity and stability in the reaction process.

Description

technical field [0001] The present invention relates to a kind of Cu-ZnO / SiO 2 The airgel bimetallic catalyst and its preparation method and application belong to the field of organic catalysis. Background technique [0002] As an organic chemical product, the output of methanol is second only to basic raw materials such as ethylene, propylene and pure benzene in the world. There are many derivatives of methanol, which are used to manufacture various organic products such as formaldehyde, acetic acid, dimethyl ether, low-carbon olefins, methyl chloride, methylamine, etc. It is also one of the important raw materials for pesticides and medicines, so it is called C 1 The basis of chemistry. The world's methanol production is dominated by natural gas. my country is a country rich in coal, poor in gas and little in oil. Coal is the main raw material for methanol production. In recent years, foreign methanol has a strong cost advantage. Due to the rise in international oil and...

AI Technical Summary

Problems solved by technology

In addition, the reaction device provides favorable conditions for the deep processing of high value-added products such as formic acid, ester acid and acetic anhydride; disadvantages: need to use anhydrous methanol with a higher price; must use CO with a concentration higher than 80%; (3) Methanol catalysis Dehydrogenation method, methanol direct dehydrogenation method to prepare methyl formate has the advantages of single raw material, low equipment investment, environmental friendliness and by-production of hydrogen, etc. Southwest Research Institute of Chemical Industry in my country has developed an industrial device with an annual output of 2kt, and the conversion rate of methanol is 30 %-40%, methyl formate selectivity reaches about 80%

In the process of preparing methyl formate by catalytic dehydrogenation of methanol, the conversion rate of methanol and the yield of methyl formate are low. Research and development of new catalysts in order to maximize the single-pass yield of methyl formate is still a research hotspot at present.

Images