Influence of temperature on hydroxylation of benzene to phenol using molecular oxygen catalyzed by V/SiO2

Influence of temperature on hydroxylation of benzene to phenol using molecular oxygen catalyzed by V/SiO2
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温度对V/SiO2催化苯分子氧羟基化制苯酚的影响

DOI:
10.1016/j.catcom.2013.03.018
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发表时间:
2013-07
影响因子:
3.7
通讯作者:
Sun, Qi
Sun, Qi
中科院分区:
化学3区
文献类型:
--
作者:
Du, Weidong;Chen, Gang;Shi, Lei;Sun, Qi

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以V/SiO2为催化剂,采用不同还原剂,研究了温度对分子氧氧化苯羟基化制苯酚反应的影响。采用溶胶-凝胶法制备了钒物种高度分散的V/SiO2复合材料,并用紫外-可见漫反射光谱和电子顺磁共振谱对其进行了表征。结果表明,不同还原剂对苯羟基化反应的起始温度范围和苯酚产率最大值的温度都有不同的影响。还原剂的还原能力可以通过改变温度来表现,并依次影响苯转化率、产物选择性和V物种的浸出量。
Effect of temperature on hydroxylation of benzene to phenol with molecular oxygen as an oxidant was studied over V/SiO2using different reductants. The V/SiO2with highly dispersed vanadium species was prepared by a sol–gel process and characterized by diffuse reflectance UV–Vis and ESR. This work shows that the onset temperature range of benzene hydroxylation and the temperature reaching the maximum phenol yield differ corresponding to each reductant. The reducing capacity of reductant can be shown by changing temperature and affects, in turn, benzene conversion, product selectivity, and the amount of leaching of V species.
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