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In-situ FTIR diagnostic for characterization and performance test of transition metal oxide catalysts
Patrick Mountapmbeme Kouotou
作者单位E-mail
Patrick Mountapmbeme Kouotou Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beisihuanxi 11, 100190 Beijing, China patrick@iet.cn 
摘要:
The present work establishes a systematic approach based on the application of in-situ Fourier transform infrared spectroscopy (FTIR) for the investigation of the crystal structure, thermal stability, redox behavior (TPR/TPO) as well as the catalytic properties of Co3O4 thin films. The syntheses of Co3O4 were achieved by chemical vapor deposition in the temperature of 400-500 °C. The structure analysis of the as-prepared material revealed the presence of two prominent IR bands peaking at 544 (υ1) and 650 (υ2) cm-1 respectively, which originate from the stretching vibrations of the Co-O bond, characteristic of the Co3O4 spinel. The lattice stability limit of Co3O4 was estimated to be above 650 °C. The redox properties of the spinel structure were determined by integrating the area under the emission bands υ1 and υ2 as a function of the temperature. Moreover, Co3O4 has been successfully tested as catalyst towards complete oxidation of dimethyl ether below 340 °C. The exhaust gas analysis during the catalytic process by in-situ absorption FTIR revealed that only CO2 and H2O were detected as the final products in the catalytic reaction. The redox behavior suggests that the oxidation of dimethyl ether over Co3O4 follows a Mars-van Krevelen type mechanism. The comprehensive application of in-situ FTIR provides a novel diagnostic tool in characterization and performance test of catalysts.
关键词:  In-situ FTIR  Diagnostic  Thermal stability  Redox property  Catalytic mechanism.
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In-situ FTIR diagnostic for characterization and performance test of transition metal oxide catalysts
Patrick Mountapmbeme Kouotou
Abstract:
The present work establishes a systematic approach based on the application of in-situ Fourier transform infrared spectroscopy (FTIR) for the investigation of the crystal structure, thermal stability, redox behavior (TPR/TPO) as well as the catalytic properties of Co3O4 thin films. The syntheses of Co3O4 were achieved by chemical vapor deposition in the temperature of 400-500 °C. The structure analysis of the as-prepared material revealed the presence of two prominent IR bands peaking at 544 (υ1) and 650 (υ2) cm-1 respectively, which originate from the stretching vibrations of the Co-O bond, characteristic of the Co3O4 spinel. The lattice stability limit of Co3O4 was estimated to be above 650 °C. The redox properties of the spinel structure were determined by integrating the area under the emission bands υ1 and υ2 as a function of the temperature. Moreover, Co3O4 has been successfully tested as catalyst towards complete oxidation of dimethyl ether below 340 °C. The exhaust gas analysis during the catalytic process by in-situ absorption FTIR revealed that only CO2 and H2O were detected as the final products in the catalytic reaction. The redox behavior suggests that the oxidation of dimethyl ether over Co3O4 follows a Mars-van Krevelen type mechanism. The comprehensive application of in-situ FTIR provides a novel diagnostic tool in characterization and performance test of catalysts.
Key words:  In-situ FTIR  Diagnostic  Thermal stability  Redox property  Catalytic mechanism.