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Improvement of catalyst stability of ZSM-5 zeolite containing calcium by modification with CaCO3.

Authors
Journal
Applied Catalysis
0166-9834
Publisher
Elsevier
Publication Date
Volume
33
Issue
1
Identifiers
DOI: 10.1016/s0166-9834(00)80593-x

Abstract

Abstract The catalyst life of Ca H ZSM 5, which yields high selectivities to light olefins in methanol conversion, was significantly extended by modification with CaCO 3. The amount of coke on CaCO 3/Ca H ZSM 5 after a long-term aging in methanol conversion was considerably less than that on Ca H ZSM 5, indicating that CaCO 3 inhibits the formation of an excessive amount of coke. However, CaCO 3 can hardly prevent the catalyst structure from degradation caused by dealumination with water. From these results, we have concluded that CaCO3 is effective for the improvement of resistance to coking rather than that to steaming, for high catalyst stability.

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