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首页> 外文期刊>Catalysis science & technology >One-step hydroxylation of benzene to phenol via a Pd capillary membrane microreactor
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One-step hydroxylation of benzene to phenol via a Pd capillary membrane microreactor

机译：通过PD毛细管膜微反应器将苯对苯酚的一步羟基化

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摘要

A novel Pd capillary membrane microreactor for one-step hydroxylation of benzene to phenol was synthesized and investigated to showcase the effectiveness of 'Niwa concept'. Reaction parameters including H2/O2 ratio and temperature were systematically studied for their effects on benzene conversion and phenol yield. A detailed examination of different membrane reactors, feed mode and long-term reaction stability was also conducted. Pd capillary membrane displayed good stability for low temperature separation and reaction due to the excellent anchorage of Pd layer into the porous α-alumina support. An optimum H2/O2 ratio was identified at 473 K with the benzene conversion of 19.6% and phenol yield of 18.1%. An increase in reaction temperature caused not only an increase in benzene conversion but also a decrease in phenol selectivity. A comparison between our work and the literature results was also made to discuss the feasibility of the membrane reactor concept. Experimental results proved that narrow flow channels and larger Pd membrane surface area-to-volume ratios provided more effective area of Pd interface and promoted the radial diffusion of reactants, enabling the reactive species more opportunities to react directly with benzene resulting in high benzene conversion.
机译：合成并研究了一种新型的PD毛细管微反应器，用于苯对苯酚的一步羟基化，以展示“ NIWA概念”的有效性。系统地研究了包括H2/O2比和温度在内的反应参数对苯转化和苯酚产量的影响。还进行了对不同膜反应器，进料模式和长期反应稳定性的详细检查。 PD毛细血管膜在低温分离和反应中表现出良好的稳定性，这是由于PD层出色地锚定在多孔α-氧化铝支持中。在473 K处鉴定出最佳的H2/O2比，苯转化为19.6％，苯酚产量为18.1％。反应温度的升高不仅导致苯转化率的增加，而且导致苯酚选择性降低。我们的工作与文献结果之间的比较还进行了讨论膜反应堆概念的可行性。实验结果证明，狭窄的流动通道和较大的PD膜表面积与体积比提供了PD界面的更有效面积，并促进了反应物的径向扩散，从而使反应物种有更多的机会直接与苯作出反应，从而导致高苯转化。

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