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- W2019436862 abstract "Abstract Partial oxidation of methane to syngas (POM) over Rh/SiO 2 and Ru/SiO 2 catalysts was investigated at 450–800 °C. Methane conversion and selectivity to both H 2 and CO were higher over Rh/SiO 2 than over Ru/SiO 2 . The CO and H 2 selectivities substantially decreased with increasing GHSV over Ru/SiO 2 at 500 °C, while these selectivities remained nearly constant over Rh/SiO 2 . Both the CH 4 conversions and the CO and H 2 selectivities increased slightly over Rh/SiO 2 at 700 °C as GHSV increases, while the CH 4 conversions and the CO and H 2 selectivities decreased slightly over Ru/SiO 2 . Pulse reactions, transient reactions, and in situ microprobe Raman techniques were employed to investigate the oxidation of methane over Rh/SiO 2 and Ru/SiO 2 catalysts. CO was the main product when Rh/SiO 2 was exposed to methane pulsing at 700 °C. No CO 2 was detected during the first pulse over the Rh/SiO 2 catalysts. However, CO 2 was formed in every pulse over Ru/SiO 2 . Transient results showed that CO was formed prior to CO 2 generation over Rh/SiO 2 catalysts. CO 2 was the primary product over Ru/SiO 2 catalysts. In situ microprobe Raman spectroscopy at 450–600 °C demonstrated that Ru/SiO 2 surfaces contained significantly larger amounts of metal oxide species than Rh/SiO 2 during the POM reaction. The mechanisms of POM over the two catalysts are different. A direct oxidation process mainly occurs over the Rh/SiO 2 catalyst, while the dominant pathway over the Ru/SiO 2 catalyst is the indirect oxidation process." @default.
- W2019436862 created "2016-06-24" @default.
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- W2019436862 date "2004-09-01" @default.
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- W2019436862 title "Partial oxidation of methane to H2 and CO over Rh/SiO2 and Ru/SiO2 catalysts" @default.
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- W2019436862 doi "https://doi.org/10.1016/j.jcat.2004.05.028" @default.
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