Ppm level methane detection using micro-thermoelectric gas sensors with Pd/Al2O3 combustion catalyst films

Daisuke Nagai, Maiko Nishibori, Toshio Itoh, Tsutomu Kawabe, Kazuo Sato, Woosuck Shin

研究成果: ジャーナルへの寄稿学術誌査読

46 被引用数 (Scopus)

抄録

The CH4 combustion performance of a micro-thermoelectric gas sensor (TGS) with Pd-Al2O3 catalysts prepared using two different methods, impregnation and colloid mixing, has been investigated. Three crystal phases of Al2O3, α, θ, and γ, were used for the catalyst support; the Pd/θ-Al2O3 catalyst showed the best combustion performance. The Pd/θ-Al2O3 catalyst exhibited the best dispersion of Pd nanoparticles as analyzed by both a pulse adsorption technique and transmission electron microscopy. The effect of the catalyst thickness on the H2 and CH4 detection performance of the TGS using this Pd/θ-Al2O3 catalyst prepared using a colloid mixing method was investigated. It was found that the response voltage, ΔV, of the TGS to CH4 increased with increasing film thickness, but the ΔV to H2 decreased. The TGS with the Pd/θ-Al2O3 catalyst whose thickness was 35 μm could detect as low as 1 ppm of CH4 in air by the thermoelectric conversion of the combustor heat to an electrical voltage.

本文言語英語
ページ(範囲)488-494
ページ数7
ジャーナルSensors and Actuators, B: Chemical
206
DOI
出版ステータス出版済み - 1月 2015

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 器械工学
  • 凝縮系物理学
  • 表面、皮膜および薄膜
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学

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