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Catalysis in Green Chemistry and Engineering

ISSN Imprimir: 2572-9896
ISSN On-line: 2572-990X

Catalysis in Green Chemistry and Engineering

DOI: 10.1615/CatalGreenChemEng.2018028627
pages 293-306

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

Perala Venkataswamy
Department of Chemistry, Osmania University, Hyderabad 500 007, India
Damma Devaiah
Chemical Engineering, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH 45221-0012, USA
Deboshree Mukherjee
Catalysis and Fine Chemicals Department, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 007, India
Muga Vithal
Department of Chemistry, Osmania University, Hyderabad 500 007, India
Benjaram Mahipal Reddy
Catalysis and Fine Chemicals Department, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 007, India

RESUMO

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.


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