Investigations on the effect of Mn ions on the local structure and photocatalytic activity of Cu(I)-ZSM-5 catalysts.
The introduction of Mn ions into Cu(I)-ZSM-5 was found to lead to an enhancement of the photocatalytic activity for the direct decomposition of N2O into N2 and O2 at 298 K. Various in-situ techniques such as ESR, photoluminescence, XAFS as well as a combination of CO-FT-IR and CO-TPD measurements revealed that the accommodation of Mn ions within ZSM-5 zeolite cavities significantly affects the location sites of the ion-exchanged Cu(II) ions as well as the local structure of the Cu(I) ion species formed by evacuation at high temperatures. Moreover, the introduction of Mn ions into ZSM-5 led to an increase in the amount of 3-coordinated Cu(I) species at the main channel of the zeolite, playing a major role as the active species for the photocatalytic decomposition of N2O into N2 and O2.
Chen
Haijun
H
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan.
Matsuoka
Masaya
M
Zhang
Jinlong
J
Anpo
Masakazu
M