Abstract
This study mainly focuses on the understanding of metal substitution over nanocomposites in determining the suitable catalyst. Transition metals (Ni, Fe, and Co) are substituted in active lanthanide (CeO2) and inert (ZrO2) supported nanocomposites using sonochemical synthesis. The goal of the following research is to achieve high CO2 conversions at low temperatures by using low-cost catalysts. Textural and morphological characterizations are implemented for the M/CeZ (M = Ni, Fe, and Co; CeZ = CeO2-ZrO2) catalysts using BET and SEM. The catalysts showed a reasonable surface area of 55 m2/g and a pore volume of 0.012 cc/g. The effective ionic substitution is further confirmed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). At 400 °C, the Ni-doped CeZ composite showed 48 % CO2 conversion and 90 % CH4 selectivity. Due to strong metal support interaction and the adsorption affinity of the reactants, Ni substitution offered better catalytic activity compared to Fe and Co.
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