Gold supported on ceria doped by Me3+ (Me = Al and Sm) for water gas shift reaction: Influence of dopant and preparation method

dc.contributor.authorAndreeva, D.en_US
dc.contributor.authorKantcheva, M.en_US
dc.contributor.authorIvanov, I.en_US
dc.contributor.authorIlieva, L.en_US
dc.contributor.authorSobczak, J. W.en_US
dc.contributor.authorLisowski, W.en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractGold catalysts supported on ceria doped by Sm and Al were studied. The influence of the preparation method, as well as the nature of dopants on the structure, properties and WGS activity are investigated. The applied methods of preparation cause the modification of ceria in a different extent. In the sample prepared by co-precipitation (CP) and doped by Al, the vacancies are located within the bulk of ceria structure, whereas in the corresponding AuCeSmCP sample the vacancies are located most likely around Sm and the ceria structure seems to be better ordered than the Al doped ceria. There is no distinct correlation between the reducibility and WGS activity of the studied catalysts. The Au 4f XPS spectra of fresh samples reveal higher contribution of dispersed form of Au for Sm doped catalysts than for the corresponding Al doped samples. The Ce 3d XPS spectra disclose also a higher concentration of Ce3+ evaluated before the catalytic operation for Sm doped catalysts as compared with the Al doped fresh samples. The observations by "in situ" FT-IR spectroscopy agree well with the model of active sites and the, mechanism of the WGS reaction proposed recently by some of us. The amount of formate species observed on the AuCeSmCP is higher than that on the AuCeAlCP catalyst and parallels the catalytic activity. The higher concentration of active sites on the surface of the AuCeSmCP catalyst facilitates the dissociation of water.en_US
dc.source.titleCatalysis Todayen_US
dc.subjectCatalytic activityen_US
dc.subjectPreparation methodsen_US
dc.subjectSm and Al doped ceriaen_US
dc.subjectWGS activity and mechanismen_US
dc.subjectActive siteen_US
dc.subjectAl dopeden_US
dc.subjectCeria structureen_US
dc.subjectFTIR spectroscopyen_US
dc.subjectGold catalystsen_US
dc.subjectStructure , propertiesen_US
dc.subjectWater gas shift reactionsen_US
dc.subjectWGS reactionsen_US
dc.subjectXPS spectraen_US
dc.subjectCatalyst activityen_US
dc.subjectCerium compoundsen_US
dc.subjectChemical shiften_US
dc.subjectDoping (additives)en_US
dc.subjectX ray photoelectron spectroscopyen_US
dc.subjectCatalyst supportsen_US
dc.titleGold supported on ceria doped by Me3+ (Me = Al and Sm) for water gas shift reaction: Influence of dopant and preparation methoden_US
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