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6280428 
Journal Article 
Carbon dioxide adsorption and methanation on ruthenium 
Falconer, JL; Zaǧli, E 
1981 
Yes 
Journal of Catalysis
ISSN: 0021-9517
EISSN: 1090-2694 
69 
1 
1-8 
The adsorption and methanation of carbon dioxide on a ruthenium-silica catalyst were studied using temperature-programmed desorption (TPD) and temperature-programmed reaction (TPR). Carbon dioxide adsorption was found to be activated; CO2 adsorption increased significantly as the temperature increased from 298 to 435 K. During adsorption, some of the CO2 dissociated to carbon monoxide and oxygen; upon hydrogen exposure at room temperature, the oxygen reacted to water. Methanation of adsorbed CO and of adsorbed CO2, using TPR in flowing hydrogen, yielded a CH4 peak with a peak temperature of 459 K for both adsorbates, indicating that both reactions follow the same mechanism after adsorption. This peak temperature did not change with initial surface coverage of CO, indicating that methanation is first order in CO coverage. The desorption and reaction spectra for RuSiO2 were similar to those previously obtained for NiSiO2, but both CO2 formation and CH4 formation proceeded faster on Ru. Also, the details of CO desorption and the changes in CO2 and CO desorptions with initial coverage were different on the two metals.