%0 Journal Article
%A Venkataswamy, Perala
%A Devaiah, Damma
%A Mukherjee, Deboshree
%A Vithal, Muga
%A Mahipal Reddy, Benjaram
%D 2018
%I Begell House
%K CeO2 nanorods, ZnO nanoparticles, interfacial interaction, crystal plane, oxygen vacancies,
low temperature-reducibility, CO oxidation
%N 4
%P 293-306
%R 10.1615/CatalGreenChemEng.2018028627
%T ZnO-NANOPARTICLES DECORATED ON CeO2 NANORODS: AN EFFICIENT CATALYST FOR CO OXIDATION
%U https://www.dl.begellhouse.com/journals/74e300906b6eb358,673e4f21086a75d2,3261c44b4640b739.html
%V 1
%X The current study is focused on the systematic characterization and catalytic evaluation of ceria (CeO2) nanorods (NRs) and zinc oxide (ZnO) nanoparticles decorated on CeO2 nanorods (i.e., ZnO/CeO2 NRs) for CO oxidation.
Pure CeO2 NRs were successfully synthesized by a hydrothermal method, and the ZnO nanoparticles were deposited following the wet-impregnation method. The crystalline structure, morphology, composition, and surface physicochemical properties of the investigated catalysts were systematically characterized by various analytical techniques. X-ray diffraction studies confirmed doping of a few amounts of Zn2+ ions into the CeO2 lattice. More oxygen vacancies were formed in the ZnO/CeO2 NRs as evidenced by Raman and photoluminescence studies. Transmission electron
microscope images revealed that ZnO nanoparticles (~ 6.5 ± 0.5 nm) were well dispersed along the edges of the CeO2 NRs. This significant decoration led to enhanced reducibility of ZnO/CeO2 NRs, as indicated by the H2 temperature-programmed reduction results. According to the ultraviolet-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy results, ZnO/CeO2 NRs exhibited a higher concentration of Ce3+ species and were deficient in oxygen/adsorbed oxygen species. The results of the catalytic tests indicated enhanced activity for ZnO/CeO2 NRs in comparison to pure CeO2 NRs. More surface oxygen vacancies with a higher concentration of Ce3+ species, and low-temperature reducibility due to the interaction of ZnO and CeO2, were found to contribute to the observed excellent catalytic activity and stability (up to 45 h) of ZnO/CeO2 NRs in the CO oxidation.
%8 2019-01-04