Pd-Cu/Fe3O4@C催化1,4-丁炔二醇选择性加氢的研究

摘要

1,4-butene glycol is a kind of high commercial valuefine chemical.The effective way of preparing 1,4-butylene glycol is the selective hydrogenation of 1,4-butylene glycol.The double metal magnetic catalyst Pd-Cu/Fe3O4@C was prepared by impregnation method and the catalyst was characterized by some technical approaches such as X ray diffraction(XRD),X ray photoelectron spectroscopy (XPS),transmission electron microscopy (TEM)and so on.The influence catalyst performance effects of Pd/Cu molar ratio,reaction temperature,-H2 pressure,reaction time and catalyst dosage were investigated.Under the optimized conditions(Pd/Cu =1 ∶ 1,substrate/catalyst =1/90 000,50 ℃,4MPa,and 25 min),the conversion and the selectivity of hydrogenation of 1,4-butynediol could reached 95.2％ and 98.3％,respectively.The catalyst not only had high catalytic activity and selectivity,but also easy to achieve magnetic separation with the reaction product,laying the foundation for the industrial application of the process.%1,4-丁烯二醇是一种高经济价值的精细化学品,1,4-丁炔二醇选择性加氢是制备1,4-丁烯二醇的有效途径.本文采用浸渍法制备了双金属磁性催化剂Pd-Cu/Fe3O4@C,利用X射线衍射(XRD)、X射线光电子能谱(XPS)及透射电子显微镜(TEM)等技术手段对催化剂进行了表征,考察了Pd/Cu物质的量比、反应温度、H2压力、反应时间和催化剂用量等因素对催化剂性能的影响.结果表明,在Pd/Cu物质的量之比1∶1、催化剂/底物为1:90000、反应温度为50℃、H2压力为4 MPa、时间为25 min的条件下,1,4-丁炔二醇选择性加氢的转化率和选择性分别达到了95.2％和98.3％.该催化剂不仅具有高催化活性和选择性,而且易与反应产物实现磁性分离,为该过程的工业化应用奠定了基础.