RUTHENIUM-CONTAINING CATALYSTS FOR GAS PURIFICATION FROM CO, NO, AND C3H6 .1. SYNTHESIS AND CHARACTERIZATION OF PLATINUM-RUTHENIUM CATALYSTS

Citation
Nm. Popova et al., RUTHENIUM-CONTAINING CATALYSTS FOR GAS PURIFICATION FROM CO, NO, AND C3H6 .1. SYNTHESIS AND CHARACTERIZATION OF PLATINUM-RUTHENIUM CATALYSTS, Kinetics and catalysis, 38(5), 1997, pp. 685-691
Citations number
26
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
00231584
Volume
38
Issue
5
Year of publication
1997
Pages
685 - 691
Database
ISI
SICI code
0023-1584(1997)38:5<685:RCFGPF>2.0.ZU;2-3
Abstract
The results of physical and chemical studies of alumina-supported plat inum-ruthenium-cerium catalysts are reported. The effect of support, b inder, cerium additive, and preparative procedure on the formation of ruthenium-containing catalysts was analyzed by RAD, XRD, EXAFS, XPS, T PR, and X-ray fluorescence. The reasons for the catalyst stabilization upon its exposure to oxygen and high temperatures were conjectured. T he reduced platinum-ruthenium-cerium catalyst is the mixture of CeO2, CeAlO3, and unconnected clusters of platinum and ruthenium, rather tha n an alloy. Ruthenium readily transforms to RuO2 and reduces to RuO ev en at 433-443 K. This property stipulates its role in the activation a nd reduction of NO to Nz. Platinum and ruthenium are stabilized in the oxidizing medium by the formation of connected PtOx and RuO2 clusters and a perovskite-like surface moiety involving cerium and, probably, ruthenium.