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Modification of the catalytic properties of supported noble metal catalysts by carrier doping
Author(s) -
Ioannides Theophilos,
Verykios Xenophon E.
Publication year - 1995
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270180107
Subject(s) - catalysis , chemisorption , doping , crystallite , valence (chemistry) , metal , chemistry , noble metal , inorganic chemistry , electron transfer , materials science , photochemistry , crystallography , organic chemistry , optoelectronics
The influence of altervalent cation doping of TiO 2 carriers on the chemisorptive and catalytic properties of supported Pt and Rh crystallites has been investigated. It was observed that doping of the carrier with higher valence cations leads to suppression of the H 2 and CO chemisorption capacity of Pt catalysts, while their activity in hydrogenation and oxidation reactions is significantly reduced. The opposite effects were observed in the case of Rh catalysts supported on higher valence doped TiO 2 . These catalysts were found to possess higher activity in CO and CO 2 hydrogenation, in aromatics hydrogenation and in CO and C 2 H 4 oxidation. Their stability characteristics were also found to be superior to those of the undoped Rh/TiO 2 catalyst. These effects are believed to originate from an electronic type interaction at the metal‐support interface, induced by doping, which results in electron transfer from the support to the metal crystallites.