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Journal Articles

Gasochromic property of dehydrogenation-catalyst loaded tungsten trioxide

Hakoda, Teruyuki; Igarashi, Hidetoshi*; Isozumi, Yukihiro*; Yamamoto, Shunya; Aritani, Hirofumi*; Yoshikawa, Masahito

Journal of Physics and Chemistry of Solids, 74(2), p.200 - 204, 2013/02

 Times Cited Count:3 Percentile:16.12(Chemistry, Multidisciplinary)

The gasochromic property of dehydrogenation-catalyst loaded tungsten trioxide (M/WO$$_{3}$$) powders was examined in exposure to gaseous cyclohexane under different kinds and contents of catalysts, catalyst temperatures, and cyclohexane concentrations. The change in the intensity of visible lights reflected from the M/WO$$_{3}$$ powders was in situ obtained using a portable visible-light spectrometer. The catalyst of Pt was a catalyst initiating dehydrogenation and the change of reflected light intensity at lower temperatures in comparison with the catalysts of Pd and Rh. Among 0.1, 0.5, and 1wt% Pt/WO$$_{3}$$ powders, the 0.5wt% Pt/WO$$_{3}$$ powders demonstrated large change of reflected lights. The heating of 0.5wt% Pt/WO$$_{3}$$ powders at temperatures higher than 130$$^{circ}$$C was required to visually detect cyclohexane at a concentration of 1v%, lower than the combustion lower limit (1.3v%).

Oral presentation

Coloration property of dehydrogenation catalyst-loaded tungsten trioxide for cyclohexane

Igarashi, Hidetoshi; Hakoda, Teruyuki; Isozumi, Yukihiro; Tezuka, Meguru*; Yamamoto, Shunya; Yoshikawa, Masahito

no journal, , 

The coloration and dehydrogenation property of dehydrogen metal-catalyst loaded tungsten trioxide (M/WO$$_{3}$$) powders were examined for gaseous cyclohexane under different catalyst temperatures and cyclohexane concentrations to develop gasochromic materials to detect organic hydrides for hydrogen storage. The change in the color of the M/WO$$_{3}$$ powder in a glass reactor was in situ examined using a portable spectrometer with contacting with cyclohexane gases under different powder temperatures. For 5% cyclohexane, the coloration of 0.5wt% Pt/WO$$_{3}$$ was initiated at the lowest catalyst temperature of 100$$^{circ}$$C as compared with 140$$^{circ}$$C for 0.5wt% Pd/WO$$_{3}$$ and 150$$^{circ}$$C for 0.5wt% Rh/WO$$_{3}$$. The coloration of 0.5wt% Pt/WO$$_{3}$$ was also initiated for cyclohexane at concentration of 1%, lower than the combustion lower limit (1.3%), by heating at a temperature of 170$$^{circ}$$C.

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