FT-IR Emission Spectroscopy Studies of Molybdenum Oxide and Supported Molybdena on Alumina, Silica, Zirconia, and Titania

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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 in vacuo 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 MoO3 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. In situ infrared emission spectra were recorded for supported molybdena on Al2O3, SiO2, ZrO2, and TiO2, at elevated temperatures, and the nature of the molybdenum-containing species on these supports is discussed on the basis of the infrared emission results.

Keywords: Infrared emission spectroscopy; Instrumentation, emission spectroscopy; Molybdenum oxide; Supported molybdena

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702914336651

Affiliations: National Laboratory for Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023, Dalian, Peoples' Republic of China

Publication date: June 1, 1991

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