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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites


Dissecting the steps of CO2 reduction: 1. The interaction of CO and CO2 with gamma-Al2O3: an in situ FTIR study

DC Field Value Language Szanyi, Janos ko Kwak, Jahun ko 2014-09-29T01:32:00Z - 2014-09-24 ko 2014-08 -
dc.identifier.citation PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.16, no.29, pp.15117 - 15125 ko
dc.identifier.issn 1463-9076 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract The adsorption of CO2 and CO was investigated on a pure γ-Al2O3 support material that has been used in Pd and Ru catalysts for the reduction of CO2. The adsorption of CO 2 resulted in the formation of carbonates, bicarbonates and linearly adsorbed CO2 species. The amount and the nature of the adsorbed species were dependent on the annealing temperature of the alumina support. On γ-Al2O3 annealed at 473 K mostly bicarbonates formed, while no adsorbed CO2 was seen on this highly hydroxylated surface. With increasing calcination temperature the amount of both surface carbonates and linearly adsorbed CO2 increased, but still the most abundant surface species were bicarbonates. Surface carbonates and adsorbed CO2 can readily be removed from the alumina surface, while bicarbonates are stable to elevated temperatures. The interaction of CO with γ-Al2O3 is much weaker than that of CO2. At room temperature CO adsorbs only on Lewis acid sites, and can be readily removed by evacuation. At 100 K CO can probe different defect sites on the alumina surface. Under no conditions we have observed the formation of any carbonates or bicarbonates upon the interaction of CO with the pure alumina support. In co-adsorption experiments CO competes for adsorption sites with the linearly adsorbed CO2 on the 773 K-annealed γ-Al 2O3 surface, but it does not result in the desorption of CO2, rather in the increased production of weakly held carbonates. After the removal of adsorbed CO, CO2 moves back to its original adsorption sites, i.e., Lewis acidic Al3+ centers. The exposure of a CO2-saturated γ-Al2O3 to H2O did not affect any of the adsorbed surface species. The findings of this study will be used to rationalize the results of our ongoing in situ and in operando studies on the reduction of CO2 on supported Pd and Ru catalysts. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ROYAL SOC CHEMISTRY ko
dc.subject CARBON-DIOXIDE ko
dc.subject METAL-OXIDES ko
dc.subject CATALYSTS ko
dc.subject ALUMINA ko
dc.subject SPECTROSCOPY ko
dc.subject METHANATION ko
dc.subject ADSORPTION ko
dc.subject ZEOLITES ko
dc.subject PD ko
dc.title Dissecting the steps of CO2 reduction: 1. The interaction of CO and CO2 with gamma-Al2O3: an in situ FTIR study ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84903787174 ko
dc.identifier.wosid 000339173700009 ko
dc.type.rims ART ko
dc.description.wostc 0 *
dc.description.scopustc 0 * 2015-05-06 * 2014-09-24 *
dc.identifier.doi 10.1039/c4cp00616j ko
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