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Adsorbability to steam of nickel catalysts unpromoted and promot-ed with rare earth for hydrocarbon steam reforming has been comparativelyinvestigated using TPD technique.The results showed that the adsorptive ca-pacity for steam of promoted Ni catalyst was mainly attributed to the rareearth additive and the amounts of adsorbed steam on reduction state catalystswere 1—1.4 times more than those on oxidation state catalysts.The adsorp-tive capacity for steam depended on not only the impregnation mode but alsothe contents of rare earth.At high contents of rare earth,there were threedifferent adsorption sites on the surface of catalysts.But when less than1.3%,the effect on adsorbability to steam became negnigible.The promotedNi-catalyst exhibited good coking-resistance and sulfur-tolerance.This mightbe attributed to its great capacity of adsorption to steam.
Adsorbability to steam of nickel catalysts unpromoted and promot-ed with rare earth for hydrocarbon steam reforming has been comparatively investigated using TPD technique. The results showed that the adsorptive ca-pacity for steam of promoted Ni catalyst was mainly attributed to the rareearth additive and the amounts of adsorbed steam on reduction state catalystswere 1-1.4 times more than those on oxidation state catalysts. The adsorp-tive capacity for steam depended on not only the impregnation mode but alsothe contents of rare earth. At high contents of rare earth, there were threedifferent adsorption sites on the surface of catalysts. But when less than 1.3%, the effect on adsorbability to steam became negnigible. promoted to coking-resistance and sulfur-tolerance. this mightbe attributed to its great capacity of adsorption to steam .