Abstract
The catalytic reduction of NO by H2 on a Pt0.25 Rh0.75(100) alloy single crystal was investigated by high-resolution electron energy loss spectroscopy (HREELS) while the reaction was proceeding. Adsorption of NO at 500 K formed a surface with a p(3 × 1) structure. This p(3 × 1) overlayer consists of adsorbed oxygen, though it seems to be generated only with SiO2 impurities on the surface. The NO + H2 reaction formed a c(2 × 2) overlayer of N(a). Hydrogenated N in form of NHx(a) was observed in the presence of gas-phase H2. The reaction between N(a) + H2 and NHx(a) was reversible, and faster than the complete hydrogenation to NH3(g).
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