Adsorption behavior of nitrogen monoxide on KxGaxSn8-xO16 hollandite

被引：6

作者：

Fujimoto, K ^{[1
]}

Suzuki, J ^{[1
]}

Mori, T ^{[1
]}

Watanabe, M ^{[1
]}

机构：

[1] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2000年 / 19卷 / 1-3期

关键词：

hollandite; tunnel structure; NO adsorption; DRIFTS; TPD;

D O I：

10.1023/A:1008722824410

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Fine powder of KxGaxSn8-xO16 hollandite was prepared by the sol-gel process using metal alkoxides, and the adsorption behavior of nitrogen monoxide (NO) on it was examined by temperature programmed desorption (TPD) method and in situ diffuse reflectance fourier transform infrared spectroscopy. Any species other than nitrogen monoxide were not detected in the TPD measurement, and the profile showed three stages between 420 and 880 K which were regarded as the desorption of chemically adsorbed NOx species. This desorption behavior seems well consistent with the spectral changes in the FT-IR measurement. The absorption band at 1270 cm(-1) was decayed in the first stage from 420 to 640 K, and the bands at 1235 and 1570 cm(-1) in the second stage from 640 and 770 K. In the third stage above 770 K, the strong band at 1340 cm(-1) disappeared. These NOx species on the hollandite were estimated to have a form of NO3- in the first and second stages and a form of NO2- in the third stage, considering the data on adsorption of nitrogen oxides on La2O3 and CaO.

引用

页码：377 / 381

页数：5

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