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Sulfur poisoning of nickel methanation catalysts

Conference · · 71st AIChE Annu. Meet.; (United States)
OSTI ID:7101712
; ;

Sulfur poisoning of nickel methanation catalysts, i.e., alumina-supported nickel, nickel bimetallics with Co, Pt, Rh, Ru, and Ni/MoO/sub 3/, containing 3-20Vertical Bar3< by wt metal, was studied in 95Vertical Bar3< N/sub 2//4Vertical Bar3< H/sub 2//1Vertical Bar3< CO or 99Vertical Bar3< H/sub 2//1Vertical Bar3< CO mixtures containing 10 ppm H/sub 2/S. Exposure to H/sub 2/S for 24 hr caused 99Vertical Bar3< deactivation for 3Vertical Bar3< metal samples but only 50-60Vertical Bar3< loss of activity for 15-20Vertical Bar3< metal catalyst powder and 8-12Vertical Bar3< metal monolithic catalysts. None of the bimetallics showed substantially greater resistance to H/sub 2/S poisoning than nickel, but Ni/MoO/sub 3/ was more active before, during, and after exposure to H/sub 2/S. All the catalysts deactivated more rapidly in the hydrogen-rich reactant mixture, but the deactivation rate was still less than that predicted by equilibrium H/sub 2/S adsorption. The somewhat higher sulfur tolerance of monolithic catalysts is probably an effect of egg-shell or pore-mouth poisoning. Exposure of poisoned catalyst powders to pure H/sub 2/ at 675/sup 0/K irreversibly inactivated them, but successive treatment with CO and O/sub 2/ at 525/sup 0/K partly recovered the activity of Ni-Co.

Research Organization:
Brigham Young Univ.
OSTI ID:
7101712
Report Number(s):
CONF-781110-
Journal Information:
71st AIChE Annu. Meet.; (United States), Journal Name: 71st AIChE Annu. Meet.; (United States) Vol. 48d
Country of Publication:
United States
Language:
English

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Related Subjects

090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DEACTIVATION
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
METALS
METHANATION
NICKEL
POISONING
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS