Claims
- 1. A catalyst for use in converting methanol or dimethyl ether to a product containing C.sub.2 to C.sub.4 olefins, the catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-20 sec.sup.-1 when measured at a temperature of 120.degree. C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa) and being characterized by a hydrothermal stability such that, after steaming the catalyst at 1025.degree. C. for 45 minutes in 1 atmosphere steam, the catalyst exhibits a methanol conversion activity of at least 50% when contacted with methanol at a methanol partial pressure of 1 atmosphere, a temperature of 430.degree. C. and 0.5 WHSV.
- 2. The catalyst of claim 1, wherein said Diffusion Parameter of said porous crystalline material is about 0.2-5 sec.sup.-1.
- 3. The catalyst of claim 1 and containing an oxide of phosphorus.
- 4. The catalyst of claim 1 and containing about 0.05 to about 20 wt % of an oxide of phosphorus on an elemental basis.
- 5. The catalyst of claim 1, wherein the porous crystalline material is an aluminosilicate zeolite.
- 6. The catalyst of claim 5 wherein said zeolite is ZSM-5 or ZSM-11.
RELATED APPLICATIONS
This application is a continuation-in-part of our U.S. application Ser. No. 08/725,277 filed Oct. 2, 1996, now abandoned, the entire disclosure of which is expressly incorporated herein by reference.
US Referenced Citations (6)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
725277 |
Oct 1996 |
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