Accession Number : ADA117890

Title :   Dissociative Adsorption of CO2 on Oxidized and Reduced Pt/TiO2.

Descriptive Note : Technical rept. 1 Jan-31 Dec 82,


Personal Author(s) : Tanaka,Katsumi ; White,J M

PDF Url : ADA117890

Report Date : Jul 1982

Pagination or Media Count : 11

Abstract : On both oxidized and reduced Pt/TiO2, carbon dioxide decomposes at room temperature to form chemisorbed oxygen atoms and carbon monoxide. In the absence of Pt no decomposition was found. On reduced samples, the oxygen atoms were stabilized on the titania support and reacted further with CO2 to form adsorbed bidentate carbonate. On reduced Pt/TiO2, the adsorbed CO produced in the decomposition reaction produced a linearly bound species at step sites in the initial stages of the reaction. As the reaction proceeded, CO adsorbed linearly on terrace sites was found. On oxidized Pt/TiO2, the decomposition rate was much slower and only linear step site species were observed. From the results we conclude that Pt step sites are the active sites for CO2 dissociation. (Author)

Descriptors :   *Chemical dissociation, *Adsorption, *Carbon dioxide, Platinum, Titanium oxides, Substrates, Surface reactions, Surface chemistry, Chemisorption, Oxygen, Carbon monoxide, Carbonates, Ligands, Sites, Reaction kinetics

Subject Categories : Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE