Low-water ratio ethylbenzene dehydrogenation catalyst

Abstract

A catalyst for dehydrogenating ethylbenzene in the condition of low water ratio is prepared through adding at least two compounds of light RE elements other than Ce, and at least one oxide of metal chosen from Ca, Mg, Ba, B, Sn, Pb, Cu, Zn, Ti, Zr, V and Mo to the Fe-K-Ce-W system. It has high stability and activity.

Description

technical field

[0001] The invention relates to a low water ratio ethylbenzene dehydrogenation catalyst, in particular to a catalyst used for preparing styrene by ethylbenzene dehydrogenation in a low water ratio process. Background technique

[0002] Ethylbenzene dehydrogenation is a reversible reaction with strong endothermic and molecular increase. In industry, water vapor is usually used as a diluent to reduce the partial pressure of ethylbenzene and promote the reaction to move to the product. Water vapor has the following effects in the reaction:

[0003] (1) Heating the reaction raw materials to the required temperature, avoiding directly heating ethylbenzene to a higher temperature, and suppressing the generation of side reactions;

[0004] (2) Supplement heat to avoid cooling due to endothermic reaction;

[0005] (3) The carbon deposition on the catalyst is continuously removed through the water gas reaction, so that the catalyst is automatically regenerated. ...

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