(439c) Reforming of Methane over Ni and Ca Based Pyrochlore Catalysts to Produce Syngas
AIChE Annual Meeting
Wednesday, November 13, 2019 - 8:36am to 8:54am
XRD of fresh catalyst showed peaks corresponding to the base pyrochlore (La2Zr2O7) and small peaks of NiO. Additionally, a perovskite phase was also observed in the catalyst. A significant increase in the lattice constant value of the pyrochlore was seen, suggesting Ni substitution into the pyrochlore structure. Ni+2 and Ni+3 states were observed to be present on the surface from XPS. XPS and SEM-EDS analysis were done to compare the surface and bulk compositions of the catalysts. TPR showed reduction peaks at different temperatures, indicating different interaction strengths of Ni in the structure. Catalyst showed higher activity, i.e., higher conversion values of reactants for OCRM compared to DRM. Also, DRM deactivated the catalyst more significantly compared to OCRM. This could be due to limitation of carbon formation on the surface because of presence of additional oxidizing agent, i.e., oxygen. Post run TPO were also carried out to characterized the coke deposited on the surface. Carbon deposited was observed to be present in more than one phase, i.e., amorphous and polymeric.