TG/DTA of hydrogen reduction kinetics of TiO2 supported PdO chemochromic pigments

    Authors

    N. Mohajeri; A. T-Raissi;J. Baik

    Comments

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    Abbreviated Journal Title

    Thermochim. Acta

    Keywords

    Chemochromic; Hydrogen; Sensor; Kinetics; Thermogravimetric analysis; Chemistry, Analytical; Chemistry, Physical

    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 center dot center dot center dot H species to form water. This step has fast kinetics with reaction order of 0.55 and zero with respect to [PdO center dot center dot center dot H] and [H-2], respectively. (C) 2011 Elsevier B.V. All rights reserved.

    Journal Title

    Thermochimica Acta

    Volume

    518

    Issue/Number

    1-2

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    119

    Last Page

    122

    WOS Identifier

    WOS:000290187400016

    ISSN

    0040-6031

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