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The present industrial process for the multistep and indirect synthesis of phenol from benzene has several disadvantages, such as complicated synthetic route, large consumption of raw materials, and serious environmental pollution. Therefore, the direct hydroxylation of benzene to phenol in a single-stage reaction has become one of the most challenging topics in the chemical industry, from an economical and environmental point of view. The catalytic hydroxylation of benzene with hydrogen peroxide as a clean oxidant has attracted some great attention. Vanadium-containing heteropolyacids (HPAs) have been used in the hydroxylation of benzene to phenol under various reaction conditions. However, the yield of phenol from the hydroxylation of benzene over the reported catalysts is rather low. Óï¾äͨ˳£¬ÓÐÂß¼¾ÍOk£¡ |
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