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- W3207186185 abstract "Catalytic CO2 hydrogenation to methanol is one of the important reactions for environmental-related applications. Pd/CeO2 catalysts with four different ceria morphologies, i.e. polyhedral, rod, cube and polygonal, and 5 wt% Pd loading were synthesized, and their catalytic characteristics and reaction mechanism were studied. Combining the results of N2 physisorption, XRD, Raman, CO2-TPD, Py-TPD and H2-TPR analyses suggests that PdO and PdxCe1−xO2-δ linkages are present in the Pd/CeO2 catalysts, which have different interactions with different exposed planes. Pd functionalized ceria with polyhedral morphology denoted as Pd/CeO2-NPH shows the highest specific surface area with exposed facets ({111}+{110}), responsible for the formation of more oxygen vacancy and higher extent of surface oxygen mobility, and higher number of acidic-basic sites on the catalysts surface, which contributed to improved catalytic activity and selectivity. XRD and Raman spectroscopy results revealed strong metal-support interactions for the most active catalyst by forming the PdxCe1−xO2-δ linkage, which improved the formation of surface oxygen vacancies and CO2 activation on the CeO2 support and promoted dissociation of H2 on the Pd metal. In-situ DRIFTS examination provided clear evidence for the formate reaction pathway of methanol synthesis. From a mechanistic point of view, the decomposition of surface carbonate species resulted in the formation of formate, which was further hydrogenated to form crucial methoxy species followed by methanol and CO as reaction products." @default.
- W3207186185 created "2021-10-25" @default.
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- W3207186185 date "2021-10-01" @default.
- W3207186185 modified "2023-09-27" @default.
- W3207186185 title "Exploring the effect of morphology and surface properties of nanoshaped Pd/CeO2 catalysts on CO2 hydrogenation to methanol" @default.
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- W3207186185 doi "https://doi.org/10.1016/j.apcata.2021.118394" @default.
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