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The Origin of the Catalytic Activity of a Metal Hydride in CO 2 Reduction
Author(s) -
Kato Shunsuke,
Matam Santhosh Kumar,
Kerger Philipp,
Bernard Laetitia,
Battaglia Corsin,
Vogel Dirk,
Rohwerder Michael,
Züttel Andreas
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201601402
Subject(s) - hydride , hydrogen , catalysis , inorganic chemistry , dissociation (chemistry) , desorption , metal , chemistry , methanation , x ray photoelectron spectroscopy , solubility , chemical engineering , organic chemistry , adsorption , engineering
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.