| Popis: |
1. ABSTRACT. Perovskites type oxides LaMO3 (M = Ru, Ni, Mn) were synthesized by the citrate Sol-Gel method and tested as catalysts for the CO2 reforming of methane. The influence of Ru partial substitution for Ni in the LaRuO3 structure on the activity and selectivity performance was also investigated. The results were compared with those obtained with catalyst samples prepared by wet impregnation. The effects of parameters such as reaction temperature, space velocity, CH4/CO2 ratio and time on stream were investigated and optimized to higher yields of syngas. XRD, BET surface area, TEM-EDX, IR, XPS, TPR and H2 chemisorptions characterized all the solids. Among all the solids investigated, the LaRu0.8Ni0.2O3 precursor was the most active and selective catalyst, reaching values of 89% and 90% in methane conversion and CO selectivity respectively even after 150 hours on stream. A significant decrease in coke deposition for all the catalysts was obtained which constitutes an advantage for future developments of commercial reforming catalysts. |
