Sn-Fe@C催化纤维素氢解制备丙酮醇和乳酸

Production of acetol and lactic acid from cellulose hydrogenolysis over Sn-Fe@C catalysts

丙酮醇和乳酸都是具有很高利用价值的化学品,充分利用可再生的纤维素资源制备丙酮醇和乳酸,具有重要的意义。本研究采用溶胶-凝胶法并结合惰性气氛高温退火方法制备了Sn-Fe@C系列催化剂,探讨了该催化剂上纤维素水相体系一步氢解制备丙酮醇和乳酸的催化性能。研究发现,丙酮醇和乳酸的收率与催化剂的Sn/Fe比以及焙烧温度具有显著的相关性。以3Sn1Fe@C_(600)为催化剂,在240℃,5 MPa H_(2)压力和1 h的反应条件下,丙酮醇和乳酸的总收率为45.4%。催化剂物理化学性质的表征结果表明,催化剂的酸、碱性位及金属活性位点之间的协同催化作用,是纤维素选择性氢解制备丙酮醇和乳酸的关键。

Acetol and lactic acid are valuable platform chemicals that have a broad range of industrial applications and their production from renewable cellulose is of scientific and practical significance.A series of Sn-Fe@C catalysts were prepared by sol-gel and high-temperature annealing method in an inert atmosphere and then used for preparing acetol and lactic acid by one-step hydrogenolysis of cellulose in aqueous system.3Sn1Fe@C600 as catalyst,the total acetol and lactic acid yield of 45.4%were obtained at 240℃for 1 h under H_(2) atmosphere,of which the yields of acetol and lactic acid were 24.3%and 21.1%,respectively.The results indicated that the yield of acetol and lactic acid was strongly dependent on the Sn/Fe ratio of the catalyst as well as the annealing temperature.The characterizations including BET,XRD,XPS,Py-FTIR and CO_(2)-TPD were carried out to explore the relationship between the structure of catalysts and catalytic activity.The strong L acid sites,basic sites and the metal active sites of the catalyst were the key factors affecting the selective production of acetol and lactic acid from cellulose hydrogenolysis.