Open AccessXAFS study on active Pr sites in zeolite as a photocatalyst for decomposition of nitrous oxide
Author(s) -
Ebitani Kohki,
Nishi Akio,
Hirano Yoshiaki,
Yoshida Hisao,
Tanaka Tsunehiro,
Mizugaki Tomoo,
Kaneda Kiyotomi,
Morikawa Akira
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500016988
Subject(s) - x ray absorption fine structure , mordenite , decomposition , zeolite , chemistry , extended x ray absorption fine structure , adsorption , stoichiometry , inorganic chemistry , nitrous oxide , active site , catalysis , oxide , praseodymium , photocatalysis , photochemistry , absorption spectroscopy , spectroscopy , organic chemistry , physics , quantum mechanics
The praseodymium‐exchanged mordenite degassed at 873 K acted as a highly active heterogeneous photocatalyst for the stoichiometric decomposition of N 2 O. Analysis of Pr L 3 ‐edge EXAFS revealed that the Pr species were isolated each other in the large channel of zeolite, and that the active Pr species were coordinated by ca. four oxygen atoms and one Al atom. On the other hands, the inactive Pr species are surrounded by ca. 10 oxygens of adsorbed waters. The former low‐coordinated Pr species allowed a strong adsorption of N 2 O, which could be the first step of the decomposition reaction.