Carbon dioxide reforming of methane on the perovskite-type catalyst synthesized by polyol method

摘要

H_2 and CO (synthesis gas) have been extensively used in a wide range of industrial process. Recognition of their potential has drawn a great interest in the development of new technologies to transform natural gas into synthesis gas. Carbon dioxide reforming of methane is favorable for Fischer-Tropsch (FT) synthesis process to produce liquid fuels because synthesis gas with H_2/CO≤1 ratio is produced. In the present study, La_(0.8)Sr_(0.2)NiO_3 perovskite-type catalysts supported on α-Al_2O_3 were prepared by polyol method and used as a catalyst for the carbon dioxide reforming of methane. The effect of molar concentration of polyvinyl-pyrrolidone (PVP) on the reducibility, structural properties and carbon deposition was characterized by XRD, H_2-TPR, FT-IR, SEM and TGA. Carbon dioxide reforming of methane on the catalyst was performed at the different concentration of PVP. At the 1M PVP, main characteristic peaks of perovskite structure were established without impurities, thus showing the highest catalytic activity; 87.7% and 92.1% in CH_4 and CO_2 conversion, respectively. After the reaction, carbon deposition is 0.4-0.6%, while 6.2% on the Ni catalyst, indicating the perovskite-type catalyst has a superior characteristic preventing it from the carbon deposition at the carbon dioxide reforming of methane.