An infrared study of the interactions of CO and CO[sub 2] with Cu/SiO[sub 2]

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1186· OSTI ID:5845959

Clarke, D B; Suzuki, I; Bell, A T ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

The adsorption of CO and CO[sub 2] on Cu/SiO[sub 2] have been investigated by infrared spectroscopy. CO adsorbs on Cu with a heat of adsorption of 8.4 kcal/mol, whereas CO[sub 2] weakly adsorbs on both Cu and SiO[sub 2] with a heat of adsorption of 6.9 kcal/mol. As much as 24% of the adsorbed CO[sub 2] is associated with Cu, and the rest with the silica support. On freshly reduced Cu/SiO[sub 2] adsorbed CO exhibits an infrared band 2103 cm[sup [minus]1], whereas CO[sub 2] exhibits a band at 2340 cm[sup [minus]1] when adsorbed on both SiO[sub 2] and Cu surfaces. A band at 2118 cm[sup [minus]1] is also observed during CO[sub 2] exposure. This feature is attributable CO associated with Cu is measured to be about 20%. During CO[sub 2] into CO[sub s] and O[sub s]. The extent of CO[sub 2] dissociation on Cu is measured to be about 20%. During CO[sub 2] exposure, the coverage of adsorbed CO increase rapidly, goes through a maximum, and then decays. This transient is attributable to the competition of CO and CO[sub 2] for Cu sites. The effects (on the CO[sub 2] dissociation transient) of temperature, pressure, space velocity, catalyst preoxidation, and H[sub 2] addition can be explained with the proposed mechanism. 45 refs., 15 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5845959
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 142:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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10 SYNTHETIC FUELS
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION HEAT
ABSORPTION SPECTROSCOPY
ADSORPTION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
COPPER
DISSOCIATION
ELEMENTS
ENERGY
ENTHALPY
HEAT
HETEROGENEOUS CATALYSIS
HYDROGEN
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS