Catalyst development for direct heat supply from combustion to reforming in methane reforming with CO_2 and O_2

摘要

Pt(0.3)/Ni(10)/Al_2O_3 prepared by a sequential impregnation method exhibited better performance in methane reforming with CO_2 and O_2 in terms of the catalytic activity and the temperature profile of the catalyst bed than Pt(0.3)+Ni(10)/Al_2O_3 prepared by the coimpregnation method, Ni(10)/Al_2O_3, Pt(0.3)/Al_2O_3. In methane rforming with CO_2 and O_2 on monometal lic Ni(10)/Al_2O_3 catalyst, methane combustion proceeded near the catalyst bed inlet and then the methane reforming proceeded, so a large temperature gradient was observed. However, a flat temperature profile was observed on Pt(0.3)/Ni(10)/Al_2O_3. This suggests that the methane combustion and reforming can proceed simultaneously, and that the heat of combustion is effectively supplied to the reforming reaction. The surface Pt atoms on Ni catalyst can contribute to the enhancement of the catalyst reducibility. This can be an energy efficient process for syngas production, utilizing the combination of catalytic combustion with reforming.