Study On Nickel-Based Catalysts For Methane Reforming Of Carbon Dioxide

In recent years, more and more attention have been paid to methane reforming of carbon dioxide. The reaction not only consumes two greenhouse gases, but also the product of H2/CO ratio in favor of the Fischer-Tropsch synthesis reaction. Currently, the biggest problem of methane reforming of carbon dioxide is with the reaction, the catalyst is easy deactivation because of the high temperature sintering and carbon deposition, so finding a suitable catalyst became the researchers’focus of the study. Because the nickel-based catalyst has a considerable catalytic activity of precious metals and low cost so it has received highly fancied by researchers, but it easy sintering and carbon deposition is puzzles the researchers.This text focused on the preparation of catalysts Ni-M/Al2O3(M=Zr, Co, Mg, Nd). The influence of various auxiliaries, additive contents, catalysts’Calcination temperature as well as reaction temperatures on the activity of catalysts in the fixed bed reaction device was also investigated. The catalysts are detected by X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric (TG-DTG), etc. Experiment results showed that14Ni-5Mg/y-Al2O3has relatively high catalytic activity and that methane conversion rate as well as carbon monoxide absorption rate increased with the increase of the reaction temperature. When temperature reached800℃, methane conversion rate could reach above97%.14Ni/MgO-Al2O3is prepared through coprecipitation process for the carrier and impregnation method for the active component. Under800℃temperature, the catalyst activity is better than14Ni-5Mg/γ-Al2O3.The γ-Al2O3carries were disposed by using different organic solvent (ethanol, ethylene glycol and n-butyl alcohol). The catalysts10Ni/γ-Al2O3,10Ni/γ-Al2O3-e (ethanol treated catalyst carrier),10Ni/γ-AlO3-g (ethylene glycol treated catalyst carrier),10Ni/γ-Al2O3-b (n-butyl alcohol treated catalyst carrier) were prepared by impregnation method. The catalysts were characterized by X-ray diffraction and scanning electron microscopy. The catalyst activity of carbon dioxide reforming of methane reaction was evaluated. And catalysts with the better activity were to be long period researched. The research results show that by the treatment of organic solvent, the catalysts active components have good dispersion, and with the polarity increases of organic solvent, active components dispersion and anti-carbon become better.