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- W2376355105 abstract "A modified hydrothermal process method based on using urea instead of water as the solvent was used to prepare CeOHCO3.Pure CeOHCO3 with a single crystalline structure was produced by varying the experimental conditions.CeO2 particles obtained from these CeOHCO3 precursors were tested for CH4 oxidation.The temperatures for 90% methane conversion were 604 and 647 °C for CeO2 catalysts obtained from hexagonal and orthorhombic CeOHCO3,respectively,indicating that the CeO2 catalyst from hexagonal CeOHCO3(CeO2-A) was more active than that from the orthorhombic form(CeO2-D).The specific surface area and pore volume of CeO2-A were 45 m2/g and 0.35 cm3/g,respectively,which were higher than those of CeO2-D.H2-TPR showed a much lower reduction temperature and enhanced reducibility with CeO2-A.XPS and O2-TPD results demonstrated there were more oxygen vacancies on the surface of CeO2-A than on CeO2-D,which implied increased oxygen mobility.The CeOHCO3-structure dependent activity was investigated and found to originate from the morphologies of the CeOHCO3 precursors.Hexagonal CeOHCO3 had a rod-like shape while orthorhombic CeOHCO3 had a sphere-like morphology.After calcination,the obtained CeO2 had the morphology of the precursor.The difference in morphology gave CeO2 catalysts with different texture,structure,reducibility,and thus catalytic activity." @default.
- W2376355105 created "2016-06-24" @default.
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- W2376355105 date "2012-01-01" @default.
- W2376355105 modified "2023-09-23" @default.
- W2376355105 title "Effect of Structure of CeOHCO_3 Precursor of CeO_2 on Its Catalytic Performance" @default.
- W2376355105 hasPublicationYear "2012" @default.
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