甘油选择性氧化制乳酸贵金属催化剂

Recent Advances in Selective Oxidation of Glycerol to Lactic Acid over Noble Metal Catalysts

生物柴油产量增加导致副产物甘油过剩问题愈加凸显,将甘油催化转化生成高附加值化学品具有重要意义。近年来,贵金属催化剂(Au、Pt、Pd等)常被用于催化甘油转化制乳酸,其中乳酸选择性和催化剂稳定性的提高是催化剂面临的关键挑战。本文介绍了负载型贵金属催化剂催化甘油选择性氧化制乳酸的反应机理,揭示了不同金属活性位点的作用,同时,围绕贵金属活性位的结构和电子性质,讨论了金属粒径、载体、反应体系pH对反应性能的影响,分析了贵金属与载体之间的强相互作用促进甘油分子羟基活化机制。最后,阐释了甘油选择性氧化制乳酸面临的主要挑战,并对未来的发展趋势进行了展望。

The problem of excess glycerol as a by-product of biodiesel production has become more and more prominent,and the catalytic conversion of glycerol to high-value-added chemicals is of great significance.In recent years,noble metal catalysts(Au,Pt,Pd,etc.)are often used to catalyze the conversion of glycerol to lactic acid,in which the improvement of lactic acid selectivity and catalyst stability are the key challenges for the catalysts.Here,we summarized the reaction mechanism of selective oxidation of glycerol to lactic acid over supported noble metal catalysts,revealing the role of different metal active sites.At the same time,the effects of metal particle size,support,and pH of the reaction system on the reaction performance are discussed based on the structure and electronic properties of noble metal active sites.Also,the role of metal in the promotion and support of strong interaction on the activation of the hydroxyl groups of glycerol was clarified.Finally,the main challenges and prospects for the selective oxidation of glycerol to lactic acid were clarified.