FTIR spectroscopic study of the interaction of CO[sub 2] and CO[sub 2] + H[sub 2] over partially oxidized Ru/TiO[sub 2] catalyst

Journal Article · Mon Feb 28 23:00:00 EST 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(94)90020-5· OSTI ID:7034802

Gupta, N M; Kamble, V S; Iyer, R M; Kartha, V B ^[1]; Thampi, K R; Gratzel, M ^[2]

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1. Bhabha Atomic Research Centre, Bombay (India)
2. Physical Chemsitry Institute II Swiss Federal Institute of Technology, Lausanne (Switzerland)

At least three distinct linearly bound carbonyl species are identified in the adsorption of CO[sub 2] or CO[sub 2] + H[sub 2] over Ru-RuO[sub x]/TiO[sub 2] catalyst. The relative concentration and the growth of these species depend on metal oxidation state, presence of hydrogen, reaction temperature, and duration of exposure. The presence of preadsorbed or coadsorbed hydrogen promotes formation of Ru[sup 0] monocarbonyl Ru monocarbonyl hydride type species, the RuO[sub x]-(CO)[sub ad] species develop only on prolonged exposure to a dose of CO[sub 2] or CO[sub 2] + H[sub 2]. The oxygen or the hydrogen ligand bonded to ruthenium facilitates C-O bond scission. The widely reported lower temperature requirement for the CO[sub 2] methanation reaction as compared to that of CO is attributed to the high reactivity of nascent carbonyl species which give methane directly via [open quotes]active[close quotes] carbon formation. As shown earlier, the CO methanation requires multistep transformations, making the process energy intensive, particularly in the 300-450 K temperature range. The studies using [sup 2]H and [sup 13]C labeled adsorbates helped in the identification of oxygenated surface species having vibrational bands in the 1000-1800 cm[sup [minus]1] region. These species are regarded as inactive side products formed on the support and/or at the Ru-support interfaces. 34 refs., 11 figs., 1 tab.

• OSTI ID: 7034802
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 146:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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ABSORPTION SPECTROSCOPY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONYLS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
HYDROGEN
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REFRACTORY METAL COMPOUNDS
RUTHENIUM
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS