文献类型：期刊文献

中文题名：炭载体对Pt-C复合物非碱性条件下催化甘油氧化性能的影响

英文题名：Effects of carbon support on glycerol oxidation over Pt-C composite catalysts in base-free conditions

作者：雷佳契[1];段学志[1];钱刚[1];周兴贵[1]

机构：[1]化学工程联合国家重点实验室,华东理工大学化工学院,上海200237

年份：2017

卷号：68

期号：2

起止页码：679

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20172103693185);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金项目(21306046);化学工程联合国家重点实验室开放课题项目(SKL-ChE-15C03)

语种：中文

中文关键词：甘油;氧化;Pt-C复合物;载体;失活

外文关键词：glycerol;oxidation;Pt-C composite;support;deactivation

摘要：采用等量浸渍法制备了具有相似平均粒径的活性炭(AC)和碳纳米管(CNTs)负载的Pt催化剂,并比较研究了非碱性条件下两种催化剂催化甘油氧化反应的性能。结果表明,炭载体对Pt-C复合物催化甘油氧化反应的活性、选择性和稳定性有重要影响。相对于Pt/CNTs催化剂,Pt/AC催化剂中Pt 4f结合能较低,导致其表面氧的覆盖度相对较高,因而抑制了甘油的吸附,降低了甘油氧化反应的初始活性;Pt/AC催化剂会促进甘油醛进一步氧化成甘油酸以及C3产物的氧化断键;Pt/AC催化剂失活的主要原因是氧中毒和中间产物的吸附,而Pt/CNTs催化剂的失活主要是由于甘油酸的吸附堵塞Pt表面的活性位造成的。
Activated carbon(AC)and carbon nanotubes(CNTs)supported Pt catalysts with similar particle sizes prepared by incipient wetness impregnation method were used for study of base-free oxidation of glycerol.The results showed that carbon support of Pt-C composite catalysts had significant impact on reactivity,selectivity,and steady state of glycerol oxidation.Compared to Pt/CNTs catalyst,Pt/AC catalyst had a lower binding energy of Pt 4f leading to a higher oxygen coverage on catalyst surface which reduced glycerol adsorption and initial activity of glycerol oxidation.Pt/AC catalyst further favored oxidation of glyceraldehyde to glyceric acid and C—C bond cleavage of C3 products.With regards to catalyst deactivation,oxygen poison and adsorption of intermediates were main factors to Pt/AC catalyst while blockage of Pt active sites by adsorption of glyceric acid was a significant contributor to Pt/CNTs catalyst.