Dry Reforming Of Methane Over Perovskite-type Catalysts

Dry reforming of methane can make full use of the methane and carbon dioxide gases as reactants, and it can significantly reduce the greenhouse effect on environment. It can also produce the syngas with a low H2/CO ratio which can be directly used for the Fischer-Tropsch synthesis. What’s more, since it is strong endothermic reaction, dry reforming of methane reaction is often used for energy storage. Therefore, it has caused a great concern in the academic and industry field. The perovskite-type oxides have well defined structures which can produce very small metal particles after reduction, with the metal well dispersed at the surface of a basic support. It can greatly enhance the catalytic activity by partially replacing the B-sites ions.In this paper, we prepared the perovskite-type oxides LaBO3(where B=Ni, Co, Fe, Mn) before the dry reforming of methane to syngas. We investigated the synthesis conditions and catalytic activity of LaNiO3,the results showed that the perovskite-type oxides structure can be synthesized at low calcined temperature by Pechini method and La2O2CO3was responsible for the excellent catalytic behavior.By introducing the metal Co, Fe, Mn into the perovskite-type oxides, LaNiO3exhibited higher activity than LaCoO3. while LaFeO3and LaMnO3exhibited no activity.A series of industrial Ni-based catalysts precursors were also synthesized by sol-gel method with different Nickel content, as6%,14.5%,23.9%and34%. Among them, the14.5%Ni/La2O3catalyst showed the best catalytic effect. In spite of being less active than the other samples, the6%Ni/La2O3catalyst showed the highest resistance to carbon deposition and it was still stable with high activity after100h reaction.