The Origin of the Catalytic Activity of a Metal Hydride in CO2 Reduction. (9th April 2016)

• Record Type: Journal Article
• Authors: Kato, Shunsuke; Matam, Santhosh Kumar; Kerger, Philipp; Bernard, Laetitia; Battaglia, Corsin; Vogel, Dirk; Rohwerder, Michael; Züttel, Andreas
• Is Part Of: Angewandte Chemie. Volume 128:Number 20(2016)
• Page Start: 6132
• Page End: 6136
• Publication Date: 2016-04-09
• Subjects: CO2-Reduktion -- Heterogene Katalyse -- Hydrierungen -- Kohlenwasserstoffe -- Wasserstoff; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201601402
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Atomic hydrogen on the surface of a metal with high hydrogen solubility is of particular interest for the hydrogenation of carbon dioxide. In a mixture of hydrogen and carbon dioxide, methane was markedly formed on the metal hydride ZrCoH x in the course of the hydrogen desorption and not on the pristine intermetallic. The surface analysis was performed by means of time‐of‐flight secondary ion mass spectroscopy and near‐ambient pressure X‐ray photoelectron spectroscopy, for the in situ analysis. The aim was to elucidate the origin of the catalytic activity of the metal hydride. Since at the initial stage the dissociation of impinging hydrogen molecules is hindered by a high activation barrier of the oxidised surface, the atomic hydrogen flux from the metal hydride is crucial for the reduction of carbon dioxide and surface oxides at interfacial sites. Abstract : Dem Wasserstoff auf der Spur : Ein Gemisch aus Wasserstoff und Kohlendioxid bildet Methan über dem Metallhydrid ZrCoH x, nicht jedoch über unhydriertem intermetallischem ZrCo. Der Flux von atomarem Wasserstoff aus dem Metallhydrid ist entscheidend für die CO2 ‐Reduktion.