Thermo-photocatalytic degradation of benzene on Pt-loaded TiO₂/ZrO₂

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• 作者：Chengjun Ren^a ; ^{renchengjun@scu.edu.cn} ; Xiangjun Liu^b ; Guangping Wang^a ; Shang Miao^a ; Yaoqiang Chen^a ; ^{nic7501@scu.edu.cn}
• 关键词：Thermo-photocatalysis ; Synergetic effect ; Benzene ; Pt ; TiO2/ZrO2
• 刊名：Journal of Molecular Catalysis A ; Chemical
• 出版年：2012
• 期刊代码：57_13811169
• 类别：ch
• 出版时间：June, 2012
• 卷：358
• 期：Complete
• 页码：31-37
• 文件大小：635 K

摘要

A TiO₂/ZrO₂ powder was prepared using TiOSO₄ and ZrOCO₃ through a homogeneous co-precipitation process. The Pt-loaded TiO₂/ZrO₂ catalyst was obtained by loading Pt onto the powder via an incipient wetness approach. The catalyst samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, degree of dispersion, N₂ adsorption-desorption (BET) and X-ray photoelectron spectroscopy (XPS). It was found that the catalytic activity was significantly affected by Pt loadings, reduction temperatures and the reaction temperatures. A synergetic effect took place between photocatalytic and thermocatalytic reactions when benzene was engaged in the thermo-photocatalytic degradation. For 80 mg m^鈭? benzene, the kinetic constant of thermo-photocatalysis was 1.26, 1.64, 2.15 and 2.93 times higher than these ones of single photocatalysis, when 90 掳C, 120 掳C, 150 掳C and 180 掳C was applied to the reaction, respectively. The rate constant at 150 掳C, presented by the thermo-photocatalytic reaction, was 2 times higher than it was obtained from the photocatalytic reaction, under various experiment conditions. It was also found that, highly concentrated benzene, in a concentration of 1000 mg m^鈭?, was degraded effectively by thermo-photocatalysis and the mineralization rate reached 90.3%within 16 h. The thermo-photocatalytic technique was considered to have practical application foreground in the degradation of highly concentrated benzene.