Abstract
La2Zr1.44Ni0.56O7-d (LNZ6), La1.95Ca0.05Zr1.44Ni0.56O7-d (LCNZ6), La1.95Sr0.05Zr1.44Ni0.56O7-d (LSNZ6) catalysts were investigated for DRM reaction to determine the effect of Sr- and Ca- substitution at the La site in Ni substituted Lanthanum Zirconate pyrochlore. XRD confirmed the formation of the pyrochlore phase with Ni substitution. Additionally, NiO and perovskite phases of Ni were detected. XANES and XRD confirmed the reduction of Ni to active Ni0 phase in reduced and spent catalysts. LSNZ6 turned out to be the most active DRM catalyst because of the higher surface Ni content, smaller particle size and high dispersion achieved as observed from XPS, XRD, SEM-EDS elemental mapping and TPR. LSNZ6 exhibited better resistance to sintering with negligible Ni size growth compared to LCNZ6 and LNZ6. Coke formation was inevitable and LSNZ6 showed more carbon formation which suggests carbon deposition correlated directly with activity. However, it had negligible impact on the activity and stability of the catalysts.
Published Version
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