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Light sensitivity of phenol hydroxylation with TS-1

机译：TS-1对苯酚羟基化的光敏性

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Effect of light intensity on the phenol hydroxylation using hydrogen peroxide(H_2O_2)as an oxidant and titanium silicalite-1(TS-1)as a catalyst was studied.Three different levels of light intensity were examinedwithout light,18 and 500 W hght intensity.At 60 °C under the 500 W hght intensity,phenol conversion significantly increased and reached maximum conversion(50%)within 2 h.Higher light intensity provided more efficient formation of the hydroxyl radicals(~(centre dot)OH)from H_2O_2 and titanium-hydroperoxide species.The effect of hght intensity was less prominent as the temperature was further increased.The hght intensity did not have a significant effect on the desired product selectivity.The intensity of hght influenced benzoquinone product decomposition.Benzoquinone conversion under the 500 W light intensity was twice as high as that under the 18 W light and no reaction occurred under the absence of light.In addition,the light intensity affected the product selectivity from the benzoquinone reaction,enabling an alternative for product selection from phenol hydroxylation.
机译：以过氧化氢（H_2O_2）为氧化剂，钛硅沸石-1（TS-1）为催化剂，研究了光强度对苯酚羟基化的影响。分别在18和500 W hght强度下测试了三种不同强度的光强度。在60°C和500 W hght强度下，苯酚转化率显着增加并在2 h内达到最大转化率（50％）。更高的光强度可更有效地由H_2O_2和钛形成羟基自由基（〜（中心点）OH） -氢过氧化物种类.hght强度随温度的进一步升高而减弱.hght强度对所需的产物选择性没有显着影响.hght的强度影响苯醌产物的分解.500 W光照下苯醌的转化率强度是18 W光照下的两倍，在没有光照的情况下没有反应发生。苯醌反应，为苯酚羟基化提供了另一种选择产品的方法。

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