Abstract
A kinetic study of the ortho-para hydrogen conversion and the hydrogen-deuterium equilibration reaction was made on the anatase form of TiO 2, over the temperature range 93 ° to 773 °K. The products of the conversion reaction were analyzed by microthermal conductivity and those of the equilibration reaction by mass spectrometry. Three distinct temperature regions of activity were found and the results are discussed in terms of a low-temperature physical mechanism, a high-temperature chemical mechanism, and the nature of the surface sites on TiO 2.
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