Combined Air Partial Oxidation and CO_2 Reforming of Methane to Syngas over NiO/MgO Solid Solution Catalysts

摘要

The formation of a NiO/MgO solid solution is mainly dependent on the calcination temperature employed in the catalyst preparation. By calcination at 800℃ for 4h, a homogeneous solid solution can be formed between NiO and MgO. Once NiO forms solid solution with MgO, it is very difficult to reduce the NiO to Ni~0. In the composition range of 15.3-26wt% NiO, the NiO/MgO solid solution catalysts exhibit high activity and selectivity. As for the catalyst with low NiO concentration of 8.2 wt%, the activity and selectivity are low. The reduced NiO/MgO solid solution catalyst exhibits high stability for the combined air partial oxidation and CO_2 reforming of methane to synthesis gas in 120h.