title: Synthesis and characterization of hollow ZrO(2)TiO(2)/Au spheres as a highly thermal stability nanocatalyst.
abstract: A novel binary-metal-oxide-coated hollow microspheres-titanium dioxide-zirconium dioxide-coated Au nanocatalyst was prepared via a facile hydrothermal synthesis method. SEM, TEM, EDX, FTIR, XRD, UV-vis and XPS analyses were employed to characterize the composition, structure, and morphology of ZrO2-TiO2hollow spheres. The size of Au nanoparticles was found to be 3-5nm in diameter before being immobilized on the aforementioned mesoporous ZrO2-TiO2layer and used as catalysts in the reduction of 4-nitrophenol to 4-aminophenol by NaBH4. Compared with TiO2/Au and ZrO2/Au, ZrO2-TiO2/Au NPs showed a higher catalytic activity because of due to mixed oxide synergistic effect. Besides, the sample gets the highest thermal stability and reactivity at 550°C, after calcining the hollow ZT/Au NPs at 550°C, 300°C and room temperature, respectively. Finally, a possible reaction mechanism was also proposed to explain the reduction of 4-nitrophenol to 4-aminophenol over ZrO2-TiO2/Au catalyst.
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
authors.forename: Mengqiu
authors.initials: M
authors.lastname: Huang
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China. Electronic address: zhangchem@seu.edu.cn.
authors.forename: Yiwei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China. Electronic address: fchem@163.com.
authors.forename: Yuming
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
authors.forename: Shuo
authors.initials: S
authors.lastname: Zhao
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
authors.forename: Jiasheng
authors.initials: J
authors.lastname: Fang
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Sheng
keywords: Au nanocatalysts; Thermal stability; TiO(2); ZrO(2)