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Tailoring structured WGS catalysts: Impact of multilayered concept on the water surface interactions

[Display omitted] •Innovative multilayered design for structured WGS catalysts.•WGS behaviors tailored through the water surface interactions.•Surface defect influence on the absorptive, dissociative and desorptive properties. A novel multilayer approach for designing structured WGS catalyst is empl...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2018-03, Vol.222, p.124-132
Main Authors: González-Castaño, M., Saché, E. Le, Ivanova, S., Romero-Sarria, F., Centeno, M.A., Odriozola, J.A.
Format: Article
Language:English
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Summary:[Display omitted] •Innovative multilayered design for structured WGS catalysts.•WGS behaviors tailored through the water surface interactions.•Surface defect influence on the absorptive, dissociative and desorptive properties. A novel multilayer approach for designing structured WGS catalyst is employed in this study as a response to the lack of new strategies in the literature. The approach proposes the use of two successive layers with different functionalities on metallic micromonolith substrate. The WGS catalyst behavior is modulated by the nature of the inner layer which determines the active species surface population by acting on the water activation step. The catalytic promotion attained by introducing inner ceria containing solids with increasing number of oxygen defects is intensely analyzed through FT-IR and H2O-TPD. Several evidences about the participation of the oxygen vacancies, as key sites, for water absorption processes are established. Besides, remarkable relationships between the water absorption strengths and the water splitting processes within their influence on the catalyst performance are also discussed.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2017.10.018