Method for alkane selective catalytic oxidation reaction

Abstract

The invention discloses a method for efficient alkane selective catalytic oxidation reaction. Alkane is used as a raw material, copper salt-metal salt is used as a catalytic system in a trifluoroacetic acid and/or trifluoroacetic anhydride system, a reaction is carried out in the presence of an oxidizing agent, and a selective catalytic oxidation reaction is carried out, wherein the metal salt isone or more of lithium salt, sodium salt, potassium salt, cesium salt, calcium salt or magnesium salt. The metal salt is used as a catalyst auxiliary agent and is matched with the copper salt for useso that the reaction activity of the catalyst in alkane catalytic oxidation is remarkably improved, the use amount of the catalyst is remarkably reduced while the high yield of the product is guaranteed, and the catalytic efficiency of the catalyst is improved. Taking methane as an example, the trifluoroacetic acid methane is prepared by adopting the method, the highest yield is about 72%, and theselectivity is about 92%, the conditions of the reaction process are relatively mild, the reaction can be performed at 90 DEG C, and the obtained methyl trifluoroacetate can be subjected to various conversions 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...

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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 improv...

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