학술논문
TG/DTA of hydrogen reduction kinetics of TiO2 supported PdO chemochromic pigments
Document Type
Article
Author
Source
Subject
*HYDROGEN
*CHEMICAL reduction
*TITANIUM dioxide
*THERMOGRAVIMETRY
*CHEMICAL kinetics
*DETECTORS
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Language
ISSN
0040-6031
Abstract
Abstract: Titania supported palladium oxide (PdO) chemochromic pigments have been used in various hydrogen sensing devices as a passive technique for detecting hydrogen leaks. Here, we present new data for the kinetics of titania-supported PdO reduction by hydrogen gas by means of thermogravimetric/differential thermal (TG/DTA) analysis. The TG/DTA thermograms show a two step process. The first step in the process is an induction period during which no color change occurs – having zero reaction order with respect to palladium oxide concentration [PdO]. A color change is associated with the second step during which the adsorbed hydrogen reacts with PdO⋯H species to form water. This step has fast kinetics with reaction order of 0.55 and zero with respect to [PdO⋯H] and [H2], respectively. [Copyright &y& Elsevier]