INFLUENCE OF WATER AND HYDROCARBON PROCESSED IN FEEDSTREAM ON THE 3-WAY BEHAVIOR OF PLATINUM-ALUMINA CATALYSTS

Citation
Jr. Gonzalezvelasco et al., INFLUENCE OF WATER AND HYDROCARBON PROCESSED IN FEEDSTREAM ON THE 3-WAY BEHAVIOR OF PLATINUM-ALUMINA CATALYSTS, Applied catalysis. B, Environmental, 12(1), 1997, pp. 61-79
Citations number
32
Categorie Soggetti
Chemistry Physical","Engineering, Environmental
ISSN journal
09263373
Volume
12
Issue
1
Year of publication
1997
Pages
61 - 79
Database
ISI
SICI code
0926-3373(1997)12:1<61:IOWAHP>2.0.ZU;2-S
Abstract
The influence of water and the nature of the hydrocarbon -methane, eth ylene, propene and 1-butene- processed in the feedstream on the three- way behaviour of a ceria-modified alumina supported platinum catalyst is investigated. Experiments were carried out with static feedstreams with air-to-fuel ratios between 14.13 and 15.17 as well as with oxidiz ing-reducing cycled feedstreams simulating the real automobile exhaust mixture. Conclusions are drawn on the importance of water-gas shift a nd steam reforming reactions and their relationship with inhibition se lf-poisoning effects of carbon monoxide and/or hydrocarbons. Compariso n of data of the prepared catalyst and those obtained at the same oper ational conditions with two commercial catalysts, with only platinum/a lumina and platinum-rhodium/ceria-alumina respectively, allows confirm ation of the effects of ceria and establishes the role of rhodium when added to the catalyst.