Carbon dioxide reforming of methane over La-Ce-Ni perovskite type catalysts

• Main Authors: Liou,Yu-Jyun, 劉宇峻
• Other Authors: 王清輝
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/76094548778245581173

碩士 === 高苑科技大學 === 化工與生化工程研究所 === 100 === The incipient wetness impregnation and the sol-gel method were employed to prepare catalysts. The activities of the catalysts for carbon dioxide reforming of methane were measured by a packed-bed reactor. The results indicate that active species, support and promoter (metal oxide) are important factors affecting catalyst activity. NiO/Al2O3 was found to be the most active catalyst among five prepared supported single metal oxide catalysts (with NiO, Fe2O3, Co3O4, CuO, MnO2, as the active species and -Al2O3 as the supports). With NiO as the active species, -Al2O3 is the most suitable among the four tested supports (-Al2O3, CeO2, V2O5 and TiO2). For the series of LaMnO3、LaFeO3、LaNiO3 and LaCoO3 catalysts, LaNiO3 was the most active catalyst. The activity test results indicate that with La0.8A'0.2NiO3 (A' = Ce、Ca、Sr、Ag) as the catalyst. Partially substituting La with Ce increases the activity and the La0.8 Ce 0.2NiO3 catalyst has the highest activity. That is the optimal value for the substitution fraction of La by Ce in the La1-xCexNiO3 (X=0、0.2、0.4、0.6、0.8) catalyst was found to be 0.4. A kinetic study on the carbon dioxide reforming of methane over La0.6Ce0.4NiO3 honeycomb support catalyst was carried out in a differential reactor. Power-rate law, Langmuir-Hinshelwood (CO2 and CH4 adsorbed on the same kind of active sites; CO2 and CH4 adsorbed on two different kinds of active sites) and Mars Van Krevelen models were used to analyze the results of the carbon dioxide reforming of methane.