Oxidation of adamantane by urea hydroperoxide using vanadium complex anchored onto functionalized Si-MCM-41
Oxidation of adamantane by urea hydroperoxide using vanadium complex anchored onto functionalized Si-MCM-41
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DOI：
10.1016/s1381-1169(03)00462-x
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发表时间：
2004-01
影响因子：
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通讯作者：
T. Joseph;M. Hartmann;S. Ernst;S. B. Halligudi
中科院分区：
文献类型：
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作者：
T. Joseph;M. Hartmann;S. Ernst;S. B. Halligudi
通过共价键将四齿配合物3-[N，N′-双-3-（水杨醛缩氨基）乙基三胺]钒（VO）（Salten）接枝到MCM-41上。通过红外光谱、X射线衍射、热重-差热分析（TG-DTA）和比表面积（BET）等测试手段对复合物进行了表征。锚固复合体后，支撑结构得到保留。基于光谱证据，设想该复合物在通道内保持其结构，并且它像一个吊坠一样悬挂在MCM-41内。这种锚定络合物允许在60°C和大气压下使用过氧化脲（UHP）作为氧化剂催化氧化金刚烷。通过改变不同的参数，对反应条件进行了优化，以达到最大转化率。反应后没有观察到络合物的浸出。
A tetradentate complex 3-[N,N′-bis-3-(salicylidenamino)ethyltriamine] vanadium(IV), VO(Salten) was grafted onto MCM-41 through a covalently linked organic moiety. This covalently anchored complex was characterized by FTIR, X-ray diffraction, thermogravimetric and differential thermogravimetric (TG–DTA) and BET measurements. The structure of the support was retained after anchoring the complex. Based on the spectroscopic evidences it was envisaged that the complex retains its structure inside the channels and it hangs like a pendant inside MCM-41. This anchored complex allowed the catalytic oxidation of adamantane using urea hydroperoxide (UHP) as the oxidizing agent at 60°C and atmospheric pressure. The reaction conditions have been optimized towards maximum conversion by varying different parameters. No leaching of the complex was observed after the reaction.