Catalyst for producing ethylene and propylene from methanol and / or dimethyl ether, its production method and use

摘要

The present invention provides a catalyst for producing ethylene and propylene from methanol and / or dimethyl ether. The catalyst is a medium pore molecular sieve catalyst employing co-improvement by lanthanum and silanization. The step of using it for the production of ethylene and propylene from methanol and / or dimethyl ether supplies methanol and / or dimethyl ether, contacts with the catalyst to produce hydrocarbons, which hydrocarbons are C1-C5 components and C6 or higher. After separation into components, the C6 or higher component is returned to the feed port of the reactor, mixed with methanol and / or dimethyl ether, and so circulated. Among them, the selectivity of ethylene and propylene in the separately collected C1-C5 product reaches 90% by weight or more, thereby realizing the maximum yield of ethylene and propylene from methanol and / or dimethyl ether. [Selection figure] None