Issue

Vol. 7 No. 3 (2015)

Improvement of a Real Gas-Sensor for the Origin of Methane Selectivity Degradation by µ-XAFS Investigation

https://doi.org/10.1007/s40820-015-0035-7
Takahiro Wada
Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8549, Japan
Naoyoshi Murata
Corporate R&D Headquarters, Fuji Electric Co., Ltd., Tokyo 191-8502, Japan
Takuya Suzuki
Corporate R&D Headquarters, Fuji Electric Co., Ltd., Tokyo 191-8502, Japan
Hiromitsu Uehara
Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
Hiroaki Nitani
Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan
Yasuhiro Niwa
Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan
Motohiro Uo
Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8549, Japan e-mail: wada.abm@tmd.ac.jp
Kiyotaka Asakura
Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan

Corresponding Author: Kiyotaka Asakura

askr@cat.hokudai.ac.jp

Nano-Micro Letters, Vol. 7 No. 3 (2015), Article Number: 255-260

Abstract

We have directly investigated the chemical state of the Pd species in a real μ-gas sensor device by examining the μ-fluorescence X-ray absorption fine structure. The μ-gas sensor device was heavily damaged by a heating process in which the temperature was ill-controlled, resulting in decrease of methane selectivity. We found that the PdO in the fresh μ-gas sensor was reduced to Pd metal particles as the methane selectivity decreased. Based on the investigation results, we modified the device structure so as to heat up homogeneously. The lifetime of the sensor was then successfully increased by more than 5 years.

Keywords

Micro gas sensor Micro-XAFS Pd/Al2O3 Deactivation
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