化学学报 ›› 2004, Vol. 62 ›› Issue (18): 1780-1784. 上一篇    下一篇

研究论文

溶液pH值及钨前驱体影响含钨过氧物种结构的Raman光谱研究

林海强1, 李华明2, 于贤勇1, 翟和生1, 袁友珠1, 万惠霖1   

  1. 1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门, 361005;
    2. 海南师范学院化学系, 海口, 571158
  • 投稿日期:2003-11-10 修回日期:2004-05-12 发布日期:2014-02-17
  • 通讯作者: 林海强,E-mail:hqlin@jingxian.xmu.edu.cn E-mail:hqlin@jingxian.xmu.edu.cn
  • 基金资助:
    福建省自然科学基金(No.E0110005)资助项目.

Raman Study of Transformation Behaviors of Tungsten-containing Peroxo Species Affected by Different Precursors and Solution Acidities

LIN Hai-Qiang1, LI Hua-Ming2, YU Xian-Yong1, ZHAI He-Sheng1, YUAN You-Zhu1, WAN Hui-Lin1   

  1. 1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiaman 361005;
    2. Department of Chemistry, Hainan Normal University, Haikou 571158
  • Received:2003-11-10 Revised:2004-05-12 Published:2014-02-17

识别水溶液体系中含过渡金属W,Mo的过氧物种结构是探索烯烃、醇及醛等与双氧水催化选择氧化反应机理的关键所在,本研究借助高灵敏度的共焦显微Raman光谱表征手段,考察了Na2WO4,(NH4)10[H2W12O42]和H3PW12O40三种含钨前驱体在不同pH值条件下与过量双氧水作用产生的主要过氧物种的结构特征,推测在酸性较强(pH<2.3)的条件下三者产生的主要过氧物种结构相同,可能是单核式的[WO2(O2)2(H2O)]2-,而二聚态或多聚态的过氧物种几乎不存在于体系中;此外,还首次建立了通过Raman光谱来半定量测定双氧水浓度的分析方法,并尝试用于双氧水催化分解的动力学研究中.

关键词: 双氧水, 含钨过氧物种, 杂多酸, Raman光谱

Tungsten and molybdenum compounds act as efficient catalysts for oxidations of olefins, alcohols or aldehydes by hydrogen peroxide. The nature of the peroxo species formed in solutions with different precursors including Na2WO4, (NH4)10[H2W12O42] and H3PW12O40 in the presence of excess H2O2 has been studied by Raman spectroscopy. Regardless of tungsten-containing precursors, mononuclear species of [WO2(O2)2(H2O)]2- is likely principal peroxo species under the conditions with low pH (pH<2.3) and excess H2O2, and other dimeric or polymeric species are almost absent. Moreover, novel method for determining H2O2 concentrations by Raman spectroscopic analysis was established and applied in kinetics study of H2O2 catalytic dismutation to H2O and O2.

Key words: hydrogen peroxide, peroxo species, heteropoly acid, Raman spectrum