The concentration of oxygen species over SiO2-supported Rh and Ru catalysts and its relationship with the mechanism of partial oxidation of methane to synthesis gas
作者： Wei Zheng Weng , Qian Gu Yan , Chun Rong Luo , Yuan Yan Liao , Hui Lin Wan
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摘要: The partial oxidation of methane (POM) to synthesis gas over SiO2-supported Rh and Ru catalysts was studied by in situ microprobe Raman time-resolved FTIR (TR-FTIR) spectroscopies. results spectroscopic characterization indicated that no band Rh2O3 detected at 500 °C the Rh/SiO2 catalyst under a flow CH4/O2/Ar (2/1/45, molar ratio) mixture, while bands RuO2 can even be 600°C Ru/SiO2 same atmosphere. experiments TR-FTIR characterizations on reactions CH4 O2 pre-treated products greatly depend concentration O2− species catalysts. On with high O2−, will completely oxidized CO2. However, if is low enough, selectively converted CO without formation parallel using spectroscopy monitor reaction mixture show mechanisms two are quite different. catalyst, mainly formed direct CH4, dominant pathway via sequence total followed reforming unconverted CO2 H2O. significant difference well related conditions due oxygen affinity metals.
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