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Elucidation of Water Promoter Effect of Proton Conductor in WGS Reaction over Pt-Based Catalyst: An Operando DRIFTS Study

AuthorsJurado, Lole; García-Moncada, Nuria; Bobadilla, L. F.; Romero-Sarria, Francisca; Odriozola, José Antonio
KeywordsWGS reaction
Proton conductor
Water activation
Grotthuss’ mechanism
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationCatalysts 10(8): 841 (2020)
AbstractA conventional Pt/CeO2/Al2O3 catalyst physically mixed with an ionic conductor (Mo- or Eu-doped ZrO2) was tested at high space velocity (20,000 h−1 and 80 L h−1 gcat−1) under model conditions (only with CO and H2O) and industrial conditions, with a realistic feed. The promoted system with the ionic conductor physically mixed showed better catalytic activity associated with better water dissociation and mobility, considered as a rate-determining step. The water activation was assessed by operando diffuse reflectance infrared fourier transformed spectroscopy (DRIFTS) studies under reaction conditions and the Mo-containing ionic conductor exhibited the presence of both dissociated (3724 cm−1) and physisorbed (5239 cm−1) water on the Eu-doped ZrO2 solid solution, which supports the appearance of proton conductivity by Grotthuss mechanism. Moreover, the band at 3633 cm−1 ascribed to hydrated Mo oxide, which increases with the temperature, explains the increase of catalytic activity when the physical mixture was used in a water gas shift (WGS) reaction.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/catal10080841
Appears in Collections:(ICMS) Artículos
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