A kind of method of alkane selective catalytic oxidation reaction

Abstract

The invention discloses a method for the selective reaction of highly efficient catalytic oxidation of alkanes. Taking alkane as raw material, in trifluoroacetic acid and / or trifluoroacetic anhydride system, using copper salt-metal salt as catalytic system, reacting in the presence of oxidant, and selective catalytic oxidation reaction occurs; wherein the metal salt is lithium salt, One or more of sodium, potassium, cesium, calcium or magnesium salts. The metal salt of the present invention, as a catalyst assistant, is used in combination with a copper salt to significantly improve the reaction activity of the catalyst in the catalytic oxidation of alkanes, while ensuring high product yield, significantly reducing the amount of the catalyst and improving its catalytic efficiency. Taking methane as an example, using the above method to prepare methane trifluoroacetic acid, the highest yield is about 72%, and the selectivity is about 92%. The reaction process conditions are relatively mild, and the reaction can be performed at 90 degrees, and the obtained methyl trifluoroacetate can be subjected to various transformations according to literature methods, such as hydrolysis into trifluoroacetic acid and methanol.

Description

technical field [0001] The invention relates to the technical field of methane catalytic oxidation, and more specifically, relates to a method for highly efficient selective reaction of catalytic oxidation of alkanes. Background technique [0002] As the main component of natural gas and biogas, methane is the most abundant fuel on earth. Due to the need of sustainable development of human society, the chemical conversion of methane has been paid more and more attention. A particular direction in the course of these conversions is the selective oxidation of methane to methanol, one of the most in-demand industrial chemicals and widely used in many fields. However, due to the highly symmetric structure with four identical C–H bonds, no dipole moment and low polarizability, methane activation becomes quite difficult. Another challenge in this area is peroxidation, because MeOH is more reactive than methane under most methane activation conditions, and methanol is more prone t...

AI Technical Summary

Problems solved by technology

Although in this scheme, the methane conversion rate and product yield are high, but the amount of catalyst used is large, that is, there is a large room for improvement in the catalytic reaction efficiency of the catalyst. In view of this, it is necessary to propose a solution to this problem , to increase its industrial viability

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