Chinese Academy of Sciences

Dali Tan

Xinhe Bao

Xiaoguang Guo

Guangzong Fang

Dehui Deng

Hao Ma

Xiulian Pan

Qinqin Yu

Jingheng Meng

A process of methane catalytic conversion produces olefins, aromatics, and hydrogen under oxygen-free, continuous flowing conditions. Such a process has little coke deposition and realizes atom-economic conversion. Under the conditions encountered in a fixed bed reactor (i.e. reaction temperature: 750-1200&#xb0; C.; reaction pressure: atmospheric pressure; the weight hourly space velocity of feed gas: 1000-30000 ml/g/h; and fixed bed), conversion of methane is 8-50%. The selectivity of olefins is 30-90%. And selectivity of aromatics is 10-70%. The catalyst for this methane conversion has a SiO-based matrix having active species that are formed by confining dopant metal atoms in the lattice of the matrix.

Oxygen-free direct conversion of methane and catalysts therefor

A reactor configuration comprises an inlet section I, a preheating section II, a transition section III, a reaction section IV and an outlet section V; except for the preheating section II and the reaction section IV, the existence of the inlet section I, the transition section III and the outlet section V depends on reaction conditions; and the process realizes no coke deposition synthesis of methane and high selectivity synthesis of ethylene. The methane conversion rate is 20-90%; ethylene selectivity is 65-95%; propylene and butylene selectivity is 5-25%; aromatic hydrocarbon selectivity is 0-30%; and coke deposition is zero.

Catalytic reactor configuration, preparation and method of direct synthesis of ethylene through oxygen-free catalysis of methane

Provided is a method for the preparation of a metal lattice-doping catalyst in an amorphous molten state, and the process of catalyzing methane to make olefins, aromatics, and hydrogen using the catalyst under oxygen-free, continuous flowing conditions. Such a process has little coke deposition and realizes atom-economic conversion. Under the conditions encountered in a fixed bed reactor (i.e. reaction temperature: 750&#x2dc;1200&#xb0; C.; reaction pressure: atmospheric pressure; the weight hourly space velocity of feed gas: 1000&#x2dc;30000 ml/g/h; and fixed bed), conversion of methane is 8-50%. The selectivity of olefins is 30&#x2dc;90%. And selectivity of aromatics is 10&#x2dc;70%. There is no coking. The reaction process has many advantages, including a long catalyst life (&#x3e;100 hrs), high stability of redox and hydrothermal properties under high temperature, high selectivity towards target products, zero coke deposition, easy separation of products, good reproducibility, safe and reliable operation, etc., all of which are very desirable for industrial application.

Synthesis of olefins from oxygen-free direct conversion of methane and catalysts thereof

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Liaoning, China

Dali Tan