Show simple item record

dc.contributor.authorVovchock, Dimitriy
dc.contributor.authorGuild, Curtis J.
dc.contributor.authorLlorca Piqué, Jordi
dc.contributor.authorPalomino, Robert M.
dc.contributor.authorWaluyo, Iradwikanari
dc.contributor.authorRodriguez, Jose A.
dc.contributor.authorSuib, Steven L.
dc.contributor.authorSenanayake, Sanjaya D.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.identifier.citationVovchock, D., Guild, C., Llorca, J., Palomino, R., Waluyo, I., Rodriguez, J.A., Suib, S., Senanayake, S. Structural and chemical state of doped and impregnated mesoporous Ni/CeO2 catalysts for the water-gas shift. "Applied catalysis A. General", 25 Octubre 2018, vol. 567, p. 1-11.
dc.description.abstractMesoporous Ni/CeO2 catalysts of variable loadings were prepared using in-situ doping and impregnation synthesis techniques. The catalysts were found to exhibit activity for the water-gas shift (WGS) reaction, particularly at temperatures above 250¿°C. Structural, electronic, and surface chemical characterizations of the materials were carried out using in-situ X-ray diffraction (XRD), in-situ X-ray absorption (XANES), and in-situ infrared (DRIFTS) techniques. The effects of metal loading and preparation method on these properties were studied in order to develop a more complete understanding of the design and application of Ni-loaded mesoporous CeO2 catalysts. For WGS reaction activity, the in-situ doping method was observed to be superior, and overall activity was observed to increase with increasing metal loadings. Simple normalization of activity data to nominal nickel content revealed a trend favoring lower loadings, indicating higher activity per unit nickel. The reduction of the catalyst is observed with increasing reaction temperature (Ni2+¿¿¿Ni°, Ce4+¿¿¿Ce3+) while the active states of all catalysts were identified as a stable, partially reduced ceria fluorite lattice (Ce4+/Ce3+) with Ni2+ and Ni°. In Situ DRIFTS showed nearly identical surface chemistry for both doped and impregnated samples, likely involving an associative pathway at lower temperatures and a redox pathway at higher temperatures. Structural properties and surface chemistry were observed to depend both on metal loading and preparation method. Nickel loadings as low as 1¿wt% prepared by in-situ doping were found to display the most favorable metal-support interactions for the WGS reaction.
dc.format.extent11 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshCerium oxides
dc.subject.lcshMesoporous materials
dc.subject.otherWater-gas shift Ceria Nickel Mesoporous In situ
dc.titleStructural and chemical state of doped and impregnated mesoporous Ni/CeO2 catalysts for the water-gas shift
dc.contributor.groupUniversitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorVovchock, D.; Guild, C.; Llorca, J.; Palomino, R.; Waluyo, I.; Rodriguez, J.A.; Suib, S.; Senanayake, S.
upcommons.citation.publicationNameApplied catalysis A. General

Files in this item


This item appears in the following Collection(s)

Show simple item record

All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder