Abstract:
Hydrogen is an important raw material in many chemical processes. It can be used as feedstock in Fischer-Tropsch process in order to produce transportation fuels and other liquid products. Moreover, it can be used as the major feedstock for Cl chemistry to produce valuable chemicals. Many researchers attempt to develop the process to produce hydrogen. Carbon dioxide reforming of methane is one of the most interesting processes. However, this reaction still has an important problem that is carbon deposition on the catalyst, which can cause plugging in the reactor and destroy the catalyst. Therefore, it is desired to develop the Ni catalyst, which presents high activity and stability in carbon dioxide reforming of methane. In this study, Ni-based catalysts supported on clinoptilolite were prepared by incipient wetness impregnation. The effects of Ni loading, promoter loading, and reaction temperature were รณdied. It was found that the appropriate amount of Ni loading was 8wt% even though the catalyst deactivation with time on stream was observed. Ce and Zr were selected to be used as the promoters in order to improve the catalytic activity and stability of the catalysts. The results showed that Ce and Zr can enhance both activity and stability of the catalyst. 8%Ni-2%Zr/clino presented the highest stability among the other catalysts. However, the catalyst was slightly deactivated with time on stream during stability testing. The results of the reaction temperature study at 600, 700, and 800℃ indicated that 700℃ was the suitable operating temperature for carbon dioxide reforming of methane reaction.
