A method for steam catalytic conversion of methane to olefins, aromatics and hydrogen

Abstract

The invention relates to a preparation method of a quartz catalytic reactor in steam catalytic cracking methane to olefins, aromatics and hydrogen. The process realizes efficient conversion of methane, generation of steam-compressed gas-phase condensed ring aromatics and secondary carbon deposits, and almost no participation of steam. Reaction, only a small amount of CO is generated, steam improves heat transfer efficiency, and high catalyst stability. The conversion rate of methane is 20-70%; the selectivity of olefins is 85-95%; the selectivity of benzene is 4.5-13%; the selectivity of CO is 0.5-2%; zero carbon deposition. The invention has the advantages of long catalyst life, good oxidation-reduction and hydrothermal stability at high temperature of the catalyst, high methane conversion rate and product selectivity, zero carbon deposition, no need for catalyst amplification, low industrialization difficulty, easy separation of products, good process repeatability, and easy operation. It has the characteristics of safety and reliability, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to the application of a quartz catalytic reactor in steam catalytic cracking methane to olefins, aromatics and hydrogen. The process realizes efficient conversion of methane, generation of steam-compressed gas-phase fused-ring aromatics and secondary carbon deposits, and improvement of heat transfer efficiency by steam. , High catalyst stability and zero carbon deposition. 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 recove...

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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