Adsorption behavior of nitrogen monoxide on KxGaxSn8-xO16 hollandite

Kenjiro Fujimoto, Jun Suzuki, Toshiyuki Mori, Mamoru Watanabe

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)377-381
Number of pages5
JournalJournal of Sol-Gel Science and Technology
Volume19
Issue number1-3
DOIs
Publication statusPublished - Dec 2000
Event10th International Workshop pn Glass and Ceramics, Hybrids and Nanocomposites from Gels - Yokohama, Jpn
Duration: 20 Sep 199924 Sep 1999

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