CATALYST USED IN THE PRODUCTION OF ETHYLENE AND PROPYLENE FROM METHANOL AND/OR DIMETHYL ETHER, METHOD FOR PREPARING THE SAME AND METHOD FOR USING THE SAME

摘要

The application provides a catalyst for producing ethylene and propylene from methanol and/or dimethyl ether, and a preparation and application thereof. In the present application, a molecular sieve catalyst co-modified by rare earth metals and silanization is utilized. First, the material containing methanol and/or dimethyl ether reacts on the catalyst to generate hydrocarbons. The hydrocarbons are separated into a C1-C5 component and a C6+ component. Then the C6+ component is recycled to the feeding port and fed into the reactor after mixing with methanol and/or dimethyl ether. The above steps are repeated, to finally generate C1-C5 products, in which the selectivity for ethylene and propylene can reach more than 90 wt % in the C1-C5 component, so that the maximal yield can be achieved in the production of ethylene and propylene from methanol and/or dimethyl ether.

主权项

1. A catalyst for producing ethylene and propylene from methanol and/or dimethyl ether, wherein said catalyst is a molecular sieve catalyst co-modified by lanthanum and silanization, wherein said molecular sieve is HZSM-5 and/or HZSM-11 zeolite molecular sieve,
wherein said catalyst co-modified by lanthanum and silanization is loaded by lanthanum, and its surface acidity is modified by silicon compounds, wherein the loading amount of said lanthanum is 0.5-5 wt % of the total weight of said catalyst, wherein the loading amount of said silicon compounds, which is based on silicon oxide, is 0.1-10 wt % of the total weight of said catalyst.