Gasochromic property of dehydrogenation-catalyst loaded tungsten trioxide

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

The gasochromic property of dehydrogenation-catalyst loaded tungsten trioxide (M/WO) 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 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 powders, the 0.5wt% Pt/WO powders demonstrated large change of reflected lights. The heating of 0.5wt% Pt/WO powders at temperatures higher than 130C was required to visually detect cyclohexane at a concentration of 1v%, lower than the combustion lower limit (1.3v%).