摘要
负载型Pt催化剂在生物质衍生化学品的选择性加氢反应中发挥着重要作用。以一种典型的MAX相Ti_(3)AlC_(2)为前驱体,用一锅水热法制备负载型Pt催化剂。在制备过程中,加入葡萄糖作为水热炭源,制备了一系列不同含量的水热炭改性的Pt催化剂。分别采用X射线衍射光谱(XRD)、透射电子显微镜(TEM)、场发射扫描电镜(SEM)以及X射线光电子能谱(XPS)等表征技术对催化剂的晶体结构、形貌、化学状态进行了分析。在生物质基模型化合物如苯酚和糠醛加氢反应中,测试了上述系列催化剂的性能。研究结果表明,与未改性的催化剂Pt/Ti_(3)Al_(x)C_(2)T_(y)相比,水热炭改性的系列催化剂Pt/Ti_(3)Al_(x)C_(2)T_(y)-glucose表现出较好的活性、选择性和稳定性,推测原因是水热炭表面含氧基团有利于吸附反应物分子提高反应动力,同时有利于稳固Pt纳米粒子减少团聚而提高稳定性。
Supported Pt catalysts play a significant role in the selective hydrogenation of bio-derived chemicals.In this study,the typical MAX phase of Ti_(3)AlC_(2) was used as the precursor to prepare Pt catalysts in one pot.Introduction of glucose as the hydrochar resource,a series of hydrochar-modified Pt catalysts were developed with different hydrochar contents.Characterizations of XRD,TEM,SEM,XPS and ICP were employed to analyze catalysts crystal phases,Pt particle size and distribution,morphologies,chemicals states of key elements and Pt real content.These catalysts were evaluated in the selective hydrogenation of bio-derived model chemicals such as phenol and furfural to investigate catalytic performances.The results demonstrated that the hydrochar-modified catalysts of Pt/Ti_(3)Al_(x)C_(2)T_(y)-glucose improved catalytic activity,selectivity,or stability,as compared with Pt/Ti_(3)Al_(x)C_(2)T_(y).The possible reasons are due to the adsorption effect of hydrochar surface functional oxygen-containing groups,which enrich reactants and boost reaction kinetics,meanwhile,the hydrochar stabilizes Pt NPs by reducing aggregation to enhance stability.
作者
张文薇
周维
马雪勤
赖海晨
张兴光
ZHANG Wenwei;ZHOU Wei;MA Xueqin;LAI Haichen;ZHANG Xingguang(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《化学工业与工程》
CSCD
北大核心
2024年第5期141-153,共13页
Chemical Industry and Engineering
基金
上海高等学校特聘教授项目(东方学者2019-2022)
关键词
生物质基平台分子
选择性加氢
PT催化剂
水热炭改性
bio-derived platform chemicals
selective hydrogenation
Pt catalysts
hydrochar modification
