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


Dissecting the steps of CO2 reduction: 2. The interaction of CO and CO2 with Pd/gamma-Al2O3: an in situ FTIR study

DC Field Value Language Szanyi, Janos ko Kwak, Jahun ko 2014-09-29T01:31:59Z - 2014-09-24 ko 2014-08 -
dc.identifier.citation PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.16, no.29, pp.15126 - 15138 ko
dc.identifier.issn 1463-9076 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract Alumina supported Pd catalysts with metal loadings of 0.5, 2.5 and 10 wt% were investigated by in situ FTIR spectroscopy in order to understand the nature of adsorbed species formed during their exposure to CO2 and CO. Exposing the annealed samples to CO2 at 295 K resulted in the formation of alumina support-bound surface species only: linear adsorbed CO 2, bidentate carbonates and bicarbonates. Room temperature exposure of all three samples to CO produced IR features characteristic of both ionic and metallic Pd, as well as bands we observed upon CO2 adsorption (alumina support-bound species). Low temperature (100 K) adsorption of CO on the three samples provided information about the state of Pd after oxidation and reduction. Oxidized samples contained exclusively ionic Pd, while mostly metallic Pd was present in the reduced samples. Subsequent annealing of the CO-saturated samples revealed the facile (low temperature) reduction of PdO x species by adsorbed CO. This process was evidenced by the variations in IR bands characteristic of ionic and metallic Pd-bound CO, as well as by the appearance of IR bands associated with CO2 adsorption as a function of annealing temperature. Samples containing oxidized Pd species (oxidized, annealed or reduced) always produced CO2 upon their exposure to CO, while no CO2-related surface entities were observed on samples having only fully reduced (metallic) Pd. This journal is ⓒ the Partner Organisations 2014. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ROYAL SOC CHEMISTRY ko
dc.subject PROMOTED RH(111) SURFACE ko
dc.subject CARBON-MONOXIDE ko
dc.subject LOW-TEMPERATURE ko
dc.subject ADSORPTION ko
dc.subject CATALYSTS ko
dc.subject POTASSIUM ko
dc.subject PD(100) ko
dc.subject ALUMINA ko
dc.subject CHEMISTRY ko
dc.title Dissecting the steps of CO2 reduction: 2. The interaction of CO and CO2 with Pd/gamma-Al2O3: an in situ FTIR study ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84903789917 ko
dc.identifier.wosid 000339173700010 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/c4cp00617h ko
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