抄録
The process to produce synthesis gas from natural gas is the largest hydrogen production source. Furthermore, synthesis gas is widely used in various important processes to produce various important chemical products. Nowadays, synthesis gas is commercially produced by steam reforming of natural gas. However, the process is endothermic so that the process is very energy intensive one. This study was conducted to produce synthesis gas by the partial oxidation of methane, which is slightly exothermic process and can save energy cost. Catalysts were prepared using Ni as an active component and using CeO2 as a support. In this reaction system, carbon deposition is known as a drawback, so we introduced La as a promoter to reduce the carbon deposition. The catalysts were prepared by the impregnation method and the urea method. The reaction was carried out in a fixed bed differential reactor at 105 Pa and 650°C. The catalysts prepared by the urea method showed 11 times higher surface areas and finer particle sizes than those prepared by the impregnation method. The catalysts prepared by the urea method showed higher methane conversion and H2 and CO selectivities than those prepared by the impregnation method. By the addition of La to the catalysts, catalytic activity does not decrease up to 10 hours. It appeared that with the introduction of La as a promoter the amount of carbon deposition was decreased.
