Structure and catalysis of Rh/Pt(100), Rh/Pt(110), Pt/Rh(100) and Pt/Rh(110) surfaces prepared by electrochemical deposition were studied. Rh/Pt(100) heated in O2 at T > 340 K gives a clear p(3×1) LEED pattern. Similar p(3×1) structure is established on Pt/Rh(100) by heating in O2 at ca. 600 K. Catalytic activity for NO + H2 is markedly enhanced by the formation of p(3×1) structure. Rh/Pt(110) and Pt/Rh(100) surfaces are also activated by the chemical reconstruction caused by O2 or NO. STM image proved that the p(3×1) Pt0.25Rh0.75(100) surface is composed of combined array of one Rh-O and two Pt rows along the 〈011〉 directions, which is responsible for catalysis of NO + H2 reaction.
|Number of pages||29|
|Journal||ACS Symposium Series|
|Publication status||Published - 1997 Dec 1|
ASJC Scopus subject areas
- Chemical Engineering(all)