Hybrid SAPO-34/ZSM-5 catalyst, its preparation and its use
AssigneeDow Global Technologies LLC
InventorsYu Liu, Andrzej Malek
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Abstract
Prepare a hybrid SAPO-34/ZSM-5 catalyst via sequential steps as follows: a) form a mixture consisting essentially of ZSM-5 as a sole source of silicon atoms, aluminum isopropoxide and a solution of orthophosphoric acid; b) combine the mixture with an aqueous solution of tetraethylammonium hydroxide to form a reaction mixture; and c) subject the reaction mixture to hydrothermal conditions for a period of time sufficient to convert the reaction mixture to a hybrid SAPO-34/ZSM-5 catalyst. Use the hybrid catalyst in converting an oxygenate (methanol and/or dimethyl ether) to an olefin.
Claims3
A process for preparing a hybrid SAPO-34/ZSM-5 catalyst that comprises sequential steps as follows:
- a) forming a mixture consisting essentially of ZSM-5 as a sole source of silicon atoms, aluminum isopropoxide and a solution of orthophosphoric acid;
- b) combining the mixture with an aqueous solution of tetraethylammonium hydroxide to form a reaction mixture;
- and c) subjecting the reaction mixture to hydrothermal conditions for a period of time sufficient to convert the reaction mixture to a hybrid SAPO-34/ZSM-5 catalyst, the hydrothermal conditions comprising a temperature within a range of from 190 degrees centigrade (° C.) to 210° C. and autogenous pressure, wherein ZSM-5 is present in a weight ratio of SAPO-34 to ZSM-5 within a range of from 96:4 to 85:15.
Dependencies are inferred from the claim text.