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Preparation and Use of High Surface Area Transition Metal Catalysts.
Us Pat 4 256 653 1981 Mar; :
Methanation catalysts were prepared from rare-earth metal alloys with group VIII metals by treating with CO and h2 to form a catalyst composed of the group VIII metal (or its carbide) and a rare-earth oxide. In an example, a ce-ni alloy with the approximate composition ceni5 was ground and reacted with CO and h2 at 275 deg- 400 deg c to obtain a catalyst containing ce oxide, ni, and some ni carbide. In other examples, a ni-misch metal alloy was oxidized to a catalyst containing ni and rare-earth oxides, and a ce-co alloy with the approximate composition ceco5 was oxidized to a catalyst containing CO and ce oxide. Chem. Abstr. 94:215,262P highly active catalysts suitable for use in hydrogenation and other reactions are prepared from an alloy of a group VIII metal (especially ni or co) with a rare-earth metal or yttrium. The alloy is ground to the desired particle size and caused to react with a gas containing CO and h2 to form an intimate mixture of the group VIII metal or its carbide with the oxide of the rare earth or yttrium. Thus, an alloy containing ce 32.3 and ni 67.7 Wt pct showed an active surface area of 40 m2/g after activation at 165 deg-210 deg c in a mixture of h2 75 and co 25 pct.
Us Pat 4,256,653, Mar. 17, 1981; (Div. of Us Pat 4,071,473, Jan. 13, 1978) Chem Abs 87:141,949Z
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