Oxy-CO2 Reforming of Methane to Syngas over CoOx/CeO2/SA-5205 Catalyst
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- 作者：V. R. Choudhary ; K. C. Mondal ; T. V. Choudhary
- 刊名：Energy & Fuels
- 出版年：2006
- 出版时间：September 2006
- 年：2006
- 卷：20
- 期：5
- 页码：1753 - 1756
- 全文大小：73K
- 年卷期：v.20,no.5(September 2006)
- ISSN：1520-5029
文摘
The oxy-CO2 methane reforming (OCRM) process has been investigated over the CoOx/CeO2/SA-5205catalyst at varying reaction temperatures (750-900 
ntities/deg.gif">C), O2/CH4 ratios (0.3-0.45), and space velocities (20 000-100 000 cm3/g/h). With an increasing OCRM reaction temperature, the contribution from the CO2 methanereforming reaction increased while that from methane combustion reactions decreased. Correspondingly, therewas an increase in the H2/CO ratio and a sharp decrease in reaction exothermicity. At 900 ntities/deg.gif">C (gas hourlyspace velocity = 46 000 cm3/g/h and O2/CH4 = 0.4), the OCRM reaction over the CoOx/CeO2/SA-5205 catalystwas mildly endothermic with >90% CH4 conversion, >95% H2 selectivity, and a H2/CO ratio of 1.63. CH4conversion was relatively unaffected by the O2/CH4 ratio used in the OCRM reaction; however, CO2 conversiondecreased on increasing the O2/CH4 ratio. While H2 selectivity was not significantly affected by the O2/CH4ratio, the H2/CO ratio increased linearly with an increasing O2/CH4 ratio. The endothermicity of the reactionwas found to decrease with an increasing CH4/O2 ratio, which can be explained on the basis of increasedcontribution from the methane partial oxidation reaction with an increasing O2/CH4 ratio.
ntities/deg.gif">C), O2/CH4 ratios (0.3-0.45), and space velocities (20 000-100 000 cm3/g/h). With an increasing OCRM reaction temperature, the contribution from the CO2 methanereforming reaction increased while that from methane combustion reactions decreased. Correspondingly, therewas an increase in the H2/CO ratio and a sharp decrease in reaction exothermicity. At 900 ntities/deg.gif">C (gas hourlyspace velocity = 46 000 cm3/g/h and O2/CH4 = 0.4), the OCRM reaction over the CoOx/CeO2/SA-5205 catalystwas mildly endothermic with >90% CH4 conversion, >95% H2 selectivity, and a H2/CO ratio of 1.63. CH4conversion was relatively unaffected by the O2/CH4 ratio used in the OCRM reaction; however, CO2 conversiondecreased on increasing the O2/CH4 ratio. While H2 selectivity was not significantly affected by the O2/CH4ratio, the H2/CO ratio increased linearly with an increasing O2/CH4 ratio. The endothermicity of the reactionwas found to decrease with an increasing CH4/O2 ratio, which can be explained on the basis of increasedcontribution from the methane partial oxidation reaction with an increasing O2/CH4 ratio.