Catalytic CO2 Reforming of Methane over Perovskite Noble Metals
A series of perovskite-type oxides catalyst LaAl1-xNixO3 (0≤x≤1) and modified by substitute noble metal La0.4Al0.2Ni0.8M0.6O3 (M=Pt, Pd, Ru, Rh, Ir) prepared by the sol-gel method shows high activity, stability, good resistance to carbon deposition and sintering of the catalyst for the reforming of methane reaction. The reaction was studied under continuous flow using a mixture of CH4:CO2=1:1. Catalysts were characterized by using BET, XRD, SEM, EDS, and HR-TEM. The specific surface area of catalysts varied greatly from 3.07 to 10.18 m2/g with the different substitution (x) following calcination at 850°C. XRD analysis of the solids shows LaNiO3 and/or LaAlO3 as the main phases present on the solids depending on the degree of substitution and more intense peaks and cell parameters showed formation of Ni-Al solid solutions. SEM coupled to an energy dispersive X-ray spectrometer (EDS) shows the possibility to obtain a solid solution of LaAl1-xNixO3 (0≤x≤1) with propionic acid as solvent. The obtained results revealed that the Rh and Ru catalysts showed the highest activity and also showed a high catalytic stability without any decrease in methane conversion up to 3000min of reaction.
Hexing Li, Qunjie Xu and Daquan Zhang
H. Arandiyan and J. H. Li, "Catalytic CO2 Reforming of Methane over Perovskite Noble Metals", Advanced Materials Research, Vols. 356-360, pp. 1070-1074, 2012