Effective heat supply from combustion to reforming in methane reforming with CO_2 and O_2: comparison between Ni and Pt catalysts

摘要

The temperature profile of the fixed catalyst bed in methane reforming with CO_2 and O_2 was investigated over Pt/Al_2O_3 and Ni/Al_2O_3. The activities on Pt/Al_2O_3 and Ni/Al_2O_3 were in the same level in methane reforming with CO_2. On the other hand, the activity of methane combustion over the catalysts was significantly different (Pt/Al_2O_3 Ni/Al_2O_3). In methane reforming with CO_2 and O_2, methane conversion over Pt/Al_2O_3 was considerably higher than over Ni/Al_2O_3.From the profiles of bed temperature measurements under various reaction conditions, one sees that the distance between combustion and reforming zones becomes very short. This is related to the reducibility of Pt metal itself, and Pt maintains metallic state in the combustion zone and under the presence of oxygen. In this case, the combustion heat can be supplied to the reforming reaction very effectively. The result can be connected to the synthesis gas production with high energy efficiency.