γ-Al2O3 Modified with Praseodymium: An Application in the Heterogeneous Catalytic Ozonation of Succinic Acid in Aqueous Solution

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• 作者：Zhiqiao He ; Angliang Zhang ; Shuang Song ; Zhiwu Liu ; Jianmeng Chen ; Xinhua Xu ; Weiping Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：December 15, 2010
• 年：2010
• 卷：49
• 期：24
• 页码：12345-12351
• 全文大小：256K
• 年卷期：v.49,no.24(December 15, 2010)
• ISSN：1520-5045

文摘

In an attempt to utilize ozone effectively, a series of praseodymium-modified γ-Al₂O₃ (Pr/Al₂O₃) was prepared via incipient wetness impregnation using Pr(NO₃)₃·6H₂O as the precursor. The structure and properties of the catalysts were studied by X-ray diffraction (XRD) and the Brunauer−Emmett−Teller (BET) method. Catalytic activity was evaluated by monitoring the degradation of succinic acid (SA) in the presence of ozone. The praseodymium modification can effectively enhance the ozonation activity of γ-Al₂O₃ upon SA removal. Increasing the calcination temperature of Pr/Al₂O₃ is disadvantageous for the catalytic process, whereas increasing the load of praseodymium is helpful. After three successive cycles, the Pr/Al₂O₃ catalyst remained stable in the catalytic ozonation of SA. Overall, the initial degradation rate of SA, as well as the saturated adsorption capacity of SA, were found to have a linear relation to changes of the surface hydroxyl groups of the catalyst. On this basis, we conclude that the significant enhancement of SA degradation using Pr/Al₂O₃ as a catalyst should be because praseodymium, in the form of Pr₆O₁₁, promoted the formation of surface hydroxyl groups. Hence, the adsorption was increased, and the degradation rate of SA was enhanced.