Open AccessCharacterization and photocatalytic reactivities of Cr‐HMS mesoporous molecular sieves
Author(s) -
Yamashita H.,
Ariyuki M.,
Higashimoto S.,
Zhang S. G.,
Chang J. S.,
Park S. E.,
Lee J. M.,
Matsumara Y.,
Anpo M.
Publication year - 1999
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/s0909049598017269
Subject(s) - molecular sieve , mesoporous material , photocatalysis , characterization (materials science) , chemical engineering , nanotechnology , chemistry , materials science , catalysis , organic chemistry , engineering
Investigations of the local structures and photocatalytic reactivity of Cr-containing mesoporous molecular sieves (CrHMS) have been carried out. Cr-HMS involves tetrahedrally coordinated Cr-oxide species which are highly dispersed and incorporated with terminal Cr=O groups in the framework of molecular sieves. On the other hand, the imp-Cr/HMS prepared by an impregnation method consists of both tetrahedrally and octahedrally coordinated Cr-oxide species. The Cr-HMS exhibits much higher photocatalytic reactivity under UV irradiation for the isomerization of cis-2-butene than the imp-Cr/HMS and Cr-silicalite microporous catalysts. The charge transfer excited state of the tetrahedrally coordinated Cr-oxide species plays a significant role in the photocatalytic reaction. 453