The Surface of Copper-Nickel Catalyst. II. Adsorption of Hydrogen on Copper, Nickel, and Copper-Nickel Catalysts

Abstract (1) The adsorption of hydrogen on copper, nickel and copper-nickel (containing 1% nickel) catalysts, prepared from the nitrates of copper and nickel were observed in the range of 100° to 130° or 120°C. (2) The shrinkage of surface with increase of reduction temperature was smaller for copper-nickel catalyst than for pure copper catalyst. (3) The rates of adsorption of hydrogen on copper and copper-nickel catalysts were far smaller than that of nickel; and the adsorption amount per unit area was the greatest for copper-nickel catalyst, while that of nickel catalyst was the smallest among the three. (4) The differential heats of adsorption of hydrogen at near zero coverage were given as 10.6kcal. both for copper and copper-nickel catalysts, and 24.2kcal. for nickel catalyst. (5) On the basis of the coincidence of the adsorption heats of copper and copper-nickel catalyst, it is suggested that the nickel paarticles supposed to exist on the surface of the copper-nickel catalyst may be covered with copper atoms.