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- W1554403911 abstract "Deactivation by carbon of nickel and nickel-molybdenum methanation catalysts was studied because the Ni-Mo catalysts were more resistant to sulfur poisoning than nickel in the Bi-Gas process for methanation of coal-derived synthesis gas. The tests included fixed-bed specific rate measurements at 498/sup 0/K, carbon deposition runs at 723/sup 0/K and low pressure (138 kPa) or high pressure (2600 kPa) in a fixed bed, fluidized-bed tests at 723/sup 0/K and 138 kPa, and catalyst regeneration tests in 1-3% air in nitrogen or 1-4% oxygen in nitrogen of a commercial nickel, a commercial nickel-molybdenum, and a commercial nickel-molybdenum-copper catalyst. At low pressure, the resistance to carbon deposition decreased in the order Ni > sulfided Ni > Ni-Mo-Cu > Ni-Mo > presulfided Ni-Mo-Cu. Deactivation at high-pressure, high-conversion conditions was masked by a fast reaction rate in a moving reaction zone which moved downstream, so that gradual deactivation was not observed. Deactivation in the fluidized bed was more rapid than in the fixed bed and the Ni-Mo catalyst deactivated more slowly than the Ni-Mo-Cu catalyst. Presulfiding apparently poisoned the gasification of active carbon. The catalysts were regenerated in dilute air or oxygen, but suffered 18-71% loss of surface area. A deactivation model that correctlymore » described all observed phenomena was developed.« less" @default.
- W1554403911 created "2016-06-24" @default.
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- W1554403911 date "1980-01-01" @default.
- W1554403911 modified "2023-09-26" @default.
- W1554403911 title "Deactivation by carbon of nickel and nickel-molybdenum methanation catalysts" @default.
- W1554403911 hasPublicationYear "1980" @default.
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