Pd基催化剂用于选择性氧化苯甲醇合成苯甲醛的研究进展

Research Progress in Pd-Based Catalysts for Synthesis of Benzaldehyde by Selective Oxidation of Benzyl Alcohol

苯甲醛是重要的化工中间体和原料。近年来,以绿色清洁的氧化剂(如空气、氧气)为原料的苯甲醇选择性氧化合成苯甲醛备受关注,而纳米Pd负载催化剂因具有高催化活性和选择性成为该反应的研究重点。主要综述了近年来碳材料、磁性材料和金属氧化物等载体的研究进展,比较了不同制备方法和Pd纳米颗粒的大小、形态对Pd催化剂的活性、选择性和稳定性影响,同时论述了Pd基双金属催化剂研究现状,最后对Pd基催化剂的合成进行了展望。发现将Pd基催化剂应用于苯甲醇选择性合成苯甲醛时,碱性载体、特定的Pd纳米尺寸、绿色的制备方法更为有利;Pd基双金属催化剂具备优异的性能和寿命,是未来的研究方向;绿色的无溶剂合成更有利于实际应用,是未来的发展趋势。

Benzaldehyde is an important chemical intermediate and raw material. In recent years, the selective oxidation of benzaldehyde with the green and clean oxidants (such as air, oxygen) has attracted much attention. Supported nano-Pd catalysts have become the focus of this reaction because of their high catalytic activity and selectivity. In this paper, we mainly reviewed the recent research progress of various supports including carbon, magnetic materials and metal oxides, compared the effects of different preparation methods and the size and morphology of Pd nanoparticles on the activity, selectivity and stability of Pd catalysts, and described the research status of Pd-based bimetallic catalysts. The development of Pd-based catalysts was also prospected. It is found that the specific Pd nanoparticle size, the basic carrier and the green preparation method are more favorable in the selective synthesis of benzaldehyde from benzyl alcohol. The Pd-based bimetallic catalyst will be a hotspot in the future because of the excellent performance and service life. The green solvent-free synthesis will be also the development trend due to the favor in practical application.