Sulfur poisoning of nickel foil methanation catalyst was studied in a gradientless glass reactor. The concentration of carbon monoxide used in this experiment was 4.8 9% by volume. It was found that the activities of nickel foils decreased more than 50-fold in the presence of 36.54, 61.5 and 70.63 ppb hydrogen sulfide at 350 ℃. The effect of temperature was studied by varying the reaction temperature. Activation energy of methanation reaction for poisoned nickel foils was determined to be 20 kcal mole^-1 which was approximately equal to that for the unpoisoned nickel foils. This is in agreement with reported value of 17 ± 2 kcal mole^-1 over unpoisoned catalysts. The experimental poisoning data at 350 ℃ f using 6 1.5 ppb hydrogen sulfide was compared to that predicted by the Infected Zone...[ Read more ]

Sulfur poisoning of nickel foil methanation catalyst was studied in a gradientless glass reactor. The concentration of carbon monoxide used in this experiment was 4.8 9% by volume. It was found that the activities of nickel foils decreased more than 50-fold in the presence of 36.54, 61.5 and 70.63 ppb hydrogen sulfide at 350 ℃. The effect of temperature was studied by varying the reaction temperature. Activation energy of methanation reaction for poisoned nickel foils was determined to be 20 kcal mole^-1 which was approximately equal to that for the unpoisoned nickel foils. This is in agreement with reported value of 17 ± 2 kcal mole^-1 over unpoisoned catalysts. The experimental poisoning data at 350 ℃ f using 6 1.5 ppb hydrogen sulfide was compared to that predicted by the Infected Zone Mode1 (EM). Steady-state activities matched each other when the infected zone size δ₀ was 0.41, but deviations were observed during the transient period of poisoning.