介孔氮杂碳负载钯的制备及其在芳环水相加氢中的应用

Mesoporous carbon nitride anchored palladium nanoparticles as active catalyst for the hydrogenation of aromatic ring in water

以MCM-41为模板合成高含氮量(质量分数为19.4%)的介孔氮杂碳(MCN),并用于负载高分散的纳米钯颗粒.在以水作溶剂的苯甲酸选择性加氢至环己基甲酸的反应中,Pd/MCN的活性是单纯活性炭(AC)负载的Pd催化剂的8.6倍.Pd/MCN在一系列苯甲酸衍生物的加氢反应中显示出较高的催化活性、选择性和稳定性.表征发现:MCN表面丰富的碱性位以及Pd和N之间的电子作用对苯甲酸加氢的活性具有重要的促进作用.

Mesoporous carbon nitride（ MCN） with high N content（ 19. 4%（ wt.）） was synthesized by nanocasting approach using MCM-41 as the template,and employed especially for anchoring well-dispersed palladium nanoparticles（ NPs） using H2 as the reductant. The activity of Pd / MCN is 8. 6 times than that of active carbon（ AC）-supported catalyst on the selective hydrogenation of benzoic acid to cyclohexane carboxylic acid in water. This catalyst is active and reusable for the hydrogenation of a series of electron-decient benzoic acids. Wide characterizations disclose that both rich basic sites on the surface of MCN and intimate electronic interaction between Pd and N may lead to the enhanced activity for the catalytic hydrogenation of benzoic acid.