Deactivation of nonuniform nickel/alumina methanation catalysts
The effect of metal distribution on the deactivation behavior of alumina-supported nickel methanation catalysts prepared with nickel that was uniformly distributed over the cross section of the pellet, concentrated in a central core, and concentrated in an outer shell was studied. Unavoidably low nickel loadings for the core and shell catalysts made it difficult to distinguish radial distribution effects from nickel dispersion or metal-support interactions effects during studies of low-pressure methanation in a constant-flow stirred reactor at 698/sup 0/F. Results indicate that the absolute deactivation rates for the uniform and core nickel catalysts are nearly equal, but the selectivity differences are appreciable. When investigators tested a zinc shell/nickel core composite catalyst to determine if the zinc shell would serve as a sulfur-getter and protect the nickel core when operating on H/sub 2/S-containing feed, the composite catalyst demonstrated a much lower H/sub 2/S-induced deactivation rate than a uniform nickel catalyst.
- Research Organization:
- Clemson Univ., SC
- OSTI ID:
- 6335884
- Journal Information:
- Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 23; ISSN IEPRA
- Country of Publication:
- United States
- Language:
- English
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