Enhanced Catalytic Activities and Characterization of Ruthenium-Grafted Halogenous Hydroxyapatite Nanorod Crystallites

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• 作者：Yanjie Zhang ; Junhu Wang ; Jie Yin ; Kunfeng Zhao ; Changzi Jin ; Yuying Huang ; Zheng Jiang ; Tao Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：October 7, 2010
• 年：2010
• 卷：114
• 期：39
• 页码：16443-16450
• 全文大小：401K
• 年卷期：v.114,no.39(October 7, 2010)
• ISSN：1932-7455

文摘

The nanorod crystallites of ruthenium-grafted halogenous hydroxyapatite (RuXAp, X = F, Cl or Br) were newly developed through a facile method and identified as highly efficient catalysts for the aerobic oxidation of alcohols. Compared with RuHAp for selective oxidation of benzyl alcohol, the existence of F, Cl, and Br elements in hydroxyapatite dramatically enhanced the catalytic activity with a prominent selectivity of far more than 99%. In particular, the RuClAp and RuFAp catalysts, respectively, showed the excellent catalytic activity of TOF = 233 and 210 h⁻¹, which was nearly 3 times higher than that of RuHAp. The RuFAp catalyst was furthermore demonstrated to be recyclable and available to be applied for various alcohols. On the basis of the DRIFT and XAFS results, the enhanced activities could be preliminarily ascribed to the electron-withdrawing effect of halogens and the greater amounts of active species existing in the surface of RuXAp compared with that of RuHAp.