Abstract
Fourier transform infrared (FT-IR) emission spectroscopy has been used to study both molybdenum oxide and supported molybdenum oxide catalysts. An infrared emission cell was specially designed to treat the samples <i>in vacuo</i> or in various gases over a wide temperature range (25-700°C). The experimental conditions including sample preparation, effects of temperature, and sample thickness on the emission spectrum are detailed. The infrared emission spectrum of pure MoO<sub>3</sub> was nearly identical to the spectrum obtained by the KBr disc transmission method. An infrared emission study on the reduction and the oxidation of molybdenum oxide is presented. <i>In situ</i> infrared emission spectra were recorded for supported molybdena on Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, ZrO<sub>2</sub>, and TiO<sub>2</sub>, at elevated temperatures, and the nature of the molybdenum-containing species on these supports is discussed on the basis of the infrared emission results.
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