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In situ Fourier Transform Infrared Spectroscopy Diagnostic for Characterization and Performance Test of Catalysts
Patrick Mountapmbeme Kouotou*,Zhen-yu Tian*
Author NameAffiliationE-mail
Patrick Mountapmbeme Kouotou* Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;Higher Institute of the Sahel, University of Maroua, P. O. Box. 46 Maroua, Cameroon patrick@iet.cn 
Zhen-yu Tian* Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China tianzhenyu@iet.cn 
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 (temperature-programmed reduction/temperatureprogrammed re-oxidation) as well as the catalytic properties of Co3O4 thin films. The syntheses of Co3O4 were achieved by chemical vapor deposition in the temperature range of 400-500℃. The structure analysis of the as-prepared material revealed the presence of two prominent IR bands peaking at 544 cm-1 (υ1) and 650 cm-1 (υ2) 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℃. 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 a catalyst towards complete oxidation of dimethyl ether below 340 ℃. 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 Fourier transform infrared spectroscopy  Diagnostic  Thermal stability  Redox property  Catalytic mechanism
FundProject:This work was supported by the Recruitment Program of Global Youth Experts and the Ministry of Science and Technology of China (No.2017YFA0402804) and the Chinese Academy of Sciences Visiting Professorship for Senior International Scientist (No.2015PT016).
利用原位傅里叶变换红外光谱诊断催化剂的特性和催化活性
Patrick Mountapmbeme Kouotou*,田振玉*
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DOI:10.1063/1674-0068/30/cjcp1705097
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