Method for preparing olefin, aromatic hydrocarbon and hydrogen through catalytic conversion of methane under hydrogen condition

Abstract

The invention relates to a preparation method for preparing olefin, aromatic hydrocarbon and hydrogen by converting methane in a quartz catalytic reactor under a hydrogen condition. In the process, efficient conversion of methane is realized, efficient dissociation of methane is promoted by hydrogen, heavy hydrocarbon generation is inhibited by hydrogen, and high catalyst stability and zero-carbon-deposition generation are realized. The conversion rate of methane is 20-70%; the olefin selectivity is 70 to 95 percent; the benzene selectivity is 5-30%, and zero carbon deposition is achieved. Themethod has the characteristics of long service lifetime of the catalyst, good oxidation reduction and hydrothermal stability of the catalyst at high temperature, high methane conversion rate and product selectivity, zero carbon deposition, no need of amplification of the catalyst, low industrialization difficulty, easiness in separation of the product, good process repeatability, safety and reliability in operation and the like, and has a wide industrial application prospect.

Description

technical field [0001] The invention relates to the application of a quartz catalytic reactor in the conversion of methane to olefins, aromatics and hydrogen under the condition of hydrogen. The process realizes the efficient conversion of methane, the hydrogen promotes the efficient dissociation of methane, and the hydrogen inhibits the formation of heavy hydrocarbons. High catalyst Stability and zero carbon buildup. Background technique [0002] The development and effective utilization of natural gas (methane) resources represents the development direction of the contemporary energy structure, and is also one of the important ways to guarantee sustainable development and green energy. In recent years, Western developed countries have also made breakthroughs in the development of shale gas and "combustible ice", and a "shale gas revolution" has broken out. There are many types of shale gas resources in my country, and the distribution is relatively concentrated. The recov...

AI Technical Summary

Problems solved by technology

For the selective oxidation of methane to produce methanol or formaldehyde, since the oxidation rate of the target product methanol and formaldehyde is much faster than that of the raw material methane, the selectivity of the reaction is low, and it is difficult to apply on a large scale.

[0008] Two patents (application numbers: 201310174960.5, 201511003407.0 and 201511003407.0) have been applied in the early stage. These two patents mainly apply for a metal-doped silicon-based catalyst, which is then placed in the reactor as a fixed bed, fluidized bed or moving bed. The process of catalytic conversion of methane to olefins; the disadvantages of these two methods are that the pressure drop of the catalyst bed is large, the heat conduction of the catalyst is poor, the temperature difference of the bed is large, and the catalyst preparation conditions are harsh and difficult to scale up.

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