Regeneration of metallic methanation catalysts
Auger electron sepctroscopy and quadrupole mass analyses of sulfur poisoning and regeneration of alumina- and titanium oxide-supported nickel catalysts showed that the surface nickel sulfide formed, NiS, has a free energy of formation, at 550/sup 0/C, of -24 kcal/mole, compared with -12 kcal/mole for bulk nickel sulfide, Ni/sub 3/S/sub 2/, i.e., the surface sulfide was more stable; and that complete oxidation of the surface oxide was possible, provided the regeneration conditions were selected to prevent the more rapidly forming nickel oxide from encapsulating the surface sulfur, e.g., 3 ppm oxygen in nitrogen and greater than or equal to 400/sup 0/C. Regeneration of a titanium oxide-supported sulfur-poisoned nickel catalyst in three stages of 6, 10, and 8 days, respectively, with low oxygen concentrations at elevated temperatures recovered the initial activity. An alumina-supported commercial catalyst was regenerated under similar conditions, but oxygen concentrations had to be kept at approx. 1 ppm.
- Research Organization:
- Univ. of Delaware
- OSTI ID:
- 6409034
- Report Number(s):
- CONF-800303-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 25:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Process for the regeneration of metallic catalysts
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