Hydroxylation of benzene and phenol in presence of vanadium grafted Beta and ZSM-5 zeolites
Hydroxylation of benzene and phenol in presence of vanadium grafted Beta and ZSM-5 zeolites
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DOI：
10.1016/j.catcom.2006.03.019
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发表时间：
2007-04
影响因子：
3.7
通讯作者：
R. Dimitrova;M. Spassova
中科院分区：
文献类型：
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作者：
R. Dimitrova;M. Spassova
在乙腈介质中，研究了钒接枝Beta和ZSM-5分子筛在353 K下苯直接氧化制苯酚和苯酚与过氧化氢羟基化反应。钒的引入通过还原性固态离子交换进行。通过FTIR、UV-Vis技术和还原/氧化循环（TPR/TPO）考察了反应前后样品的形貌特征和钒中心的稳定性。结果表明，在高钒原子效率下，钒中心在液相氧化反应产物时保持了其多重氧化态。
Vanadium grafted zeolites type Beta and ZSM-5 were investigated for direct oxidation of benzene to phenol and hydroxylation of phenol with hydrogen peroxide in acetonitrile media at 353K. The introduction of vanadium was done by reductive solid state ion exchange. The morphological characterisation of samples and the stability of the vanadium sites were examined before and after the reaction by applying FTIR, UV–Vis techniques and reduction/oxidation cycles (TPR/TPO). The results proved that the vanadium sites had retained their multiple oxidation state when used in liquid phase oxidation at high vanadium atom efficiency for the reaction product.