Premium
Opposite Face Sensitivity of CeO 2 in Hydrogenation and Oxidation Catalysis
Author(s) -
Vilé Gianvito,
Colussi Sara,
Krumeich Frank,
Trovarelli Alessandro,
PérezRamírez Javier
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201406637
Subject(s) - catalysis , vacancy defect , chemistry , oxygen , transition metal , redox , heterogeneous catalysis , chemical engineering , photochemistry , materials science , crystallography , inorganic chemistry , organic chemistry , engineering
The determination of structure–performance relationships of ceria in heterogeneous reactions is enabled by the control of the crystal shape and morphology. Whereas the (100) surface, predominantly exposed in nanocubes, is optimal for CO oxidation, the (111) surface, prevalent in conventional polyhedral CeO 2 particles, dominates in C 2 H 2 hydrogenation. This result is attributed to the different oxygen vacancy chemistry on these facets. In contrast to oxidations, hydrogenations on CeO 2 are favored over low‐vacancy surfaces owing to the key role of oxygen on the stabilization of reactive intermediates. The catalytic behavior after ageing at high temperature confirms the inverse face sensitivity of the two reaction families.