Methane oxidative coupling method based on chemical chain lattice oxygen transfer technology

Abstract

The invention belongs to the technical field of methane conversion, and particularly relates to a methane oxidative coupling method based on the chemical chain lattice oxygen transfer technology. According to the method, one-step high-efficiency methane oxidative coupling is realized through utilization of a composite material with the functions of catalytically cracking methane and selectively supplying oxygen; catalytic oxygen supply materials include methane cracking catalysts and selective oxygen supply materials, the catalysts provide active sites for activated cracking of the methane, the oxygen supply materials partially supply oxygen for reaction by transferring oxygen atoms through lattice oxygen, and catalytic oxygen carriers after the reaction are regenerated by free oxygen oxidation; oxygen transfer in the reaction is realized through circulation of redox reaction of the catalytic oxygen carriers, and direct contact between free oxygen and the methane is avoided; the lattice oxygen activity is controlled directionally, excessive oxidation of the methane is weakened, and selectivity and yield of olefin are increased; the methane oxidative coupling has high reactivity andselectivity at the temperature of 800-850 DEG C.

Description

technical field [0001] The invention belongs to the technical field of methane conversion, in particular to a methane oxidative coupling method based on chemical chain lattice oxygen transfer technology. Background technique [0002] Ethylene is the most important basic organic chemical raw material. For a long time, its production has been dependent on the petroleum cracking route, and the resulting environmental pollution and other problems are becoming more and more serious. In recent years, the price of crude oil has continued to rise, which has triggered an increase in the price of ethylene cracking raw materials. At the same time, the supply of ethylene cracking raw materials is also very prominent. Faced with this situation, countries around the world are adjusting their energy utilization structures and constantly looking for new ethylene production routes. . With the development of shale gas in the United States and the discovery of combustible ice in the South Chi...

AI Technical Summary

Problems solved by technology

In the traditional methane oxidative coupling method, methane and free oxygen are passed into the reactor according to a certain ratio. Under high temperature conditions, part of the methane is activated on the surface of the catalyst, and the other part is activated on the surface of the catalyst to generate methyl functional groups. The generated methyl functional groups A coupling reaction occurs to generate ethane and then dehydrogenates to generate ethylene. In the process of methane activation, coupling and dehydrogenation, due to the high activity of free oxygen, it will react with intermediate products in the process, resulting in excessive oxidation of methane, resulting in olefins The selectivity and yield of the reaction are low; the reaction device of this reaction contains an air separation device, which has high initial investment, high operating cost and complex structure; under high temperature conditions, free oxygen and methane are mixed, and there is a risk of explosion, which greatly Restricted its industrial development

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