文献类型：期刊文献

英文题名：Effects of Cerium Doping on Pt-Sn/Al2O3 Catalysts for n-Heptane Reforming

作者：Lin, Chang[1];Pan, Huihua[2];Yang, Zixu[1];Han, Xiaolin[2];Tian, Pengfei[1];Li, Ping[1];Xiao, Zhikai[1];Xu, Jing[1];Han, Yi-Fan[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]PetroChina Co Ltd, Petrochem Res Inst, Beijing 102206, Peoples R China

年份：2020

卷号：59

期号：14

起止页码：6424

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20201808605551);WOS:【SCI-EXPANDED(收录号:WOS:000526422700007)】；

基金：The authors are thankful to the Fund of PetroChina Special Project for Refining Catalysts (2016E-0705).

语种：英文

外文关键词：Cerium - High resolution transmission electron microscopy - Ammonia - Platinum - Aluminum oxide - Heptane - Hydrolysis - Alumina - Isomerization - Catalysts - Chlorine compounds - Isomers - Temperature programmed desorption - Fourier series - Hydrogenolysis - Ternary alloys - Cerium alloys

摘要：A series of trimetallic Pt-Sn-Ce catalysts supported on chloride Al2O3 was prepared by a sequential impregnation method and applied for n-heptane reforming and characterized by several techniques, including N-2 physiosorption, transmission electron microscopy, X-ray diffraction, hydrogen temperature-programmed reduction, CO chemisorption, ammonia temperature-programmed desorption, pyridine desorption Fourier-transform infrared spectroscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy. We have demonstrated that the introduction of Ce can promote isomerization reactions by suppressing undesirable hydrogenolysis reactions, whereas it does not significantly influence the dehydrocyclization reactions. The characterization results show that CeOx can enhance the reducibility of Pt species via enhancing the Pt dispersion. In addition, Ce increases the proportion of medium-strength acid sites, which does not only promote isomerization activity, but also suppresses the undesirable reactions such as hydrogenolysis and cracking.