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Catalysis in Green Chemistry and Engineering

Publicado 4 números por año

ISSN Imprimir: 2572-9896

ISSN En Línea: 2572-990X

H-Index: 2

Indexed in

ZnO-NANOPARTICLES DECORATED ON CeO2 NANORODS: AN EFFICIENT CATALYST FOR CO OXIDATION

Volumen 1, Edición 4, 2018, pp. 293-306
DOI: 10.1615/CatalGreenChemEng.2018028627
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SINOPSIS

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.

CITADO POR
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  3. Xie Junliang, Meng Mianwu, Lin Zhihao, Ding Hua, Chen Jianhua, Huang Siyu, Zhou Zhenming, Exploring removal of formaldehyde at room temperature over Cr- and Zn-modified Co3O4 catalyst prepared by hydrothermal method, Research on Chemical Intermediates, 46, 3, 2020. Crossref

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