TY - JOUR
T1 - Reduction of nitric oxide on the carbon pretreated Rh{331} single crystal surface; evidence for molecular CN- formation
AU - DeLouise, L. A.
AU - Winograd, N.
N1 - Funding Information:
We wish to acknowledge financial support of the National Science Foundation, the Office of Naval Research, The Air Force Office of Scientific Research and the Petroleum Research Foundation, administered by the American Chemical Society. Helpful discussions with Eric White are also appreciated.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1985/5/1
Y1 - 1985/5/1
N2 - The chemisorption of NO on the carbon pretreated Rh{331} single crystal surface has been investigated by XPS, LEED and SIMS. The carbon overlayer was prepared by dehydrogenation of chemisorbed C2H4. Results of NO adsorption at room temperature show that surface carbon blocks adsorption sites that normally coordinate molecular NOADS and its dissociated products, NAds and OAds, as determined by comparing to experiments performed on clean Rh{331}. Heating the surface which contains NOAds, nAds, OAds and CAds, induces a series of chemical reactions starting with the dissociation of molecular NOAds. Above 400 K, the CAds and NAds atoms combine to form CN-. The formation of the latter species is confirmed by the temperature evolution of the Rh2CN+ and CN- SIMS ion yields. The CAds species also reacts with OAds to produce CO and/or CO2. These processes occur preferentially over the desorption of N2 and O2. In general, it is demonstrated that by using the XPS and SIMS methods, it is possible to identify the reaction species present on the surface at any given temperature and to unravel rather complex reaction pathways.
AB - The chemisorption of NO on the carbon pretreated Rh{331} single crystal surface has been investigated by XPS, LEED and SIMS. The carbon overlayer was prepared by dehydrogenation of chemisorbed C2H4. Results of NO adsorption at room temperature show that surface carbon blocks adsorption sites that normally coordinate molecular NOADS and its dissociated products, NAds and OAds, as determined by comparing to experiments performed on clean Rh{331}. Heating the surface which contains NOAds, nAds, OAds and CAds, induces a series of chemical reactions starting with the dissociation of molecular NOAds. Above 400 K, the CAds and NAds atoms combine to form CN-. The formation of the latter species is confirmed by the temperature evolution of the Rh2CN+ and CN- SIMS ion yields. The CAds species also reacts with OAds to produce CO and/or CO2. These processes occur preferentially over the desorption of N2 and O2. In general, it is demonstrated that by using the XPS and SIMS methods, it is possible to identify the reaction species present on the surface at any given temperature and to unravel rather complex reaction pathways.
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U2 - 10.1016/0039-6028(85)90353-X
DO - 10.1016/0039-6028(85)90353-X
M3 - Article
AN - SCOPUS:0004146321
SN - 0039-6028
VL - 154
SP - 79
EP - 89
JO - Surface Science
JF - Surface Science
IS - 1
ER -