The local structures of silver(I) ion catalysts anchored within zeolite cavities and their photocatalytic reactivities for the elimination of N2O into N2 and O2

被引：74

作者：

Ju, WS ^{[1
]}

Matsuoka, M ^{[1
]}

Iino, K ^{[1
]}

Yamashita, H ^{[1
]}

Anpo, M ^{[1
]}

机构：

[1] Osaka Prefecture Univ, Grad Sch Engn, Dept Appl Chem, Sakai, Osaka 5998531, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 07期

关键词：

D O I：

10.1021/jp0302919

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ag+/ZSM-5 catalysts were prepared by an ion-exchange method and characterized by in-situ XPS, XAFS (XANES and EXAFS), UV-Vis, photoluminescence, and FT-IR investigations. These Ag+/ZSM-5 catalysts were found to exhibit an UV absorption band at around 190 nm due to the isolated Ag+ ions. The addition of N2O molecules leads to a shift in this band to 220 nm due to the adsorption of N2O on the Ag+ ions. The adsorption of N2O on the Ag+ ions could also be clarified by the appearance of characteristic FT-IR bands at 2251 cm(-1). UV irradiation of the Ag+/ZSM-5 catalysts in the presence of N2O led to the photocatalytic decomposition of N2O into N-2 and O-2 at temperatures as low as 298 K. It was found that UV light at around 200-250 nm is effective for the reaction, suggesting that excitation of the isolated Ag+ ion plays a significant role in the photocatalytic decomposition of N2O.

引用

页码：2128 / 2133

页数：6

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