کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
47424 | 46471 | 2010 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Auto-thermal and dry reforming of landfill gas over a Rh/γAl2O3 monolith catalyst Auto-thermal and dry reforming of landfill gas over a Rh/γAl2O3 monolith catalyst](/preview/png/47424.png)
Auto-thermal and dry reforming of methane and carbon dioxide mixtures was investigated experimentally at temperatures between 300 °C and 800 °C at atmospheric pressures using a Rh/γAl2O3 monolith catalyst. CH4:CO2 ratios of 1:1 and 1.4:1 were tested. The Rh catalyst reached equilibrium conversions of CH4 and CO2 to H2 and CO for both CH4:CO2 ratios. Equilibrium analysis shows that carbon formation is likely for dry reforming but not for auto-thermal reforming. Experimentally, carbon formation was seen after long-term exposure to 1.4:1 CH4:CO2 ratios without oxygen, but the catalyst has shown the ability to be regenerated in air. Auto-thermal tests, with and without external heat input, operating at an equivalence ratio of 4.3 (O2:CH4 = 0.46) and maintaining the CH4:CO2 ratio of either 1:1 or 1.4:1, did not show signs of carbon formation or deactivation. ATR experiments resulted in H2:CO ratios between 1.0 and 2.0 that can be tuned depending on the monolith temperature, beneficial in the case of downstream Fischer–Tropsch processes. For the auto-thermal experiments, theoretical reaction extents were calculated based on experimental data and showed two primary regimes in catalyst operation: a CH4 combustion and partial oxidation regime, and reforming and water–gas shift regime.
Journal: Applied Catalysis B: Environmental - Volume 94, Issues 1–2, 1 February 2010, Pages 125–133