Hydrogen–deuterium exchange of methane on nickel and potassium promoted nickel prepared by the reduction of nickel oxide

The hydrogen–deuterium exchange reactions of methane in a deuterium stream were studied by a pulse experiment over a reduced nickel (Ni1373 prepared from nickel oxide calcined at 1373 K, and Ni773 prepared from nickel oxide calcined at 773 K) and K2O promoted reduced nickel (K-Ni1373 and K-Ni773). Ni1373 had a higher exchange activity than Ni773. The effects of the addition of K2O resulted in the decrease in the exchange activity due to the inhibition of step defect sites and/or the promotion of the change of nickel crystal structure. High activity of Ni1373 could be due to that the Ni1373 had the surface of a higher Ni(1 0 0)/Ni(1 1 1) ratio.

The hydrogen–deuterium exchange reactions of methane in a deuterium stream were studied over a reduced nickel and K2O promoted reduced nickel. The effects of the addition of K2O resulted in the decrease in the exchange activity due to the inhibition of step defect sites and/or the promotion of the change of nickel crystal structure.Figure optionsDownload high-quality image (65 K)Download as PowerPoint slide