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Title: Methanation and adsorption of CO, CO + H2, CO2 and CO2 + H2 over Ru-RuOx/TiO2 catalyst: TDS and FTIR studies
Authors: Gupta, N M
Thampi, K Ravindranathan
Kamble, V S
Londhe, V P
Oz, H
Gratzel, M
Issue Date: May-1994
Publisher: NISCAIR-CSIR, India
Abstract: The adsorption of CO and CO + H2 over Ru-RuOx/TiO2 catalyst gives rise to at least three binding states identifiable with Ru(CO)n and the linearly bonded monocarbonyl species. The fraction of monocarbonyl species increases considerably in the presence of co-adsorbed hydrogen and also at higher exposure temperatures. Whereas CO2 is weakly adsorbed over catalyst surface, the exposure of catalyst to CO2 + H2 results in abundant formation of linearly-bound monocarbonyl species and adsorbed water. The CO molecules adsorbed as monocarbonyl are envisaged to be direct precursor of 'active' carbon and, hence, of methane. The lower temperature needed for CO2 + H2 reaction as compared to that for CO + H2 reaction, particularly for catalyst temperatures in the range 300450K, is attributed to the higher reactivity of nascent Ru-(CO)ad species generated directly during CO2 + H2 interaction. In the case of CO methanation under similar conditions, these species are produced during thermal transformation of multicarbonyls thus making the process energy intensive. The promotional effect of hydrogen is due to its role in the extraction of oxygen from Ru(CO)n or RU(CO2)ad species thus facilitating the formation of active 'CO' or 'C' reaction intermediates.
Page(s): 365-373
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.33A(05) [May 1994]

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