文献类型：期刊文献

英文题名：Ce-introduced effects on modification of acidity and Pt electronic states on Pt-Sn/γ-Al2O3 catalysts for catalytic reforming

作者：Lin, Chang[1];Yang, Zixu[1];Pan, Huihua[2];Cui, Jia[2];Lv, Zhi[2];Liu, Xianglin[1];Tian, Pengfei[1];Xiao, Zhikai[1];Li, Ping[1];Xu, Jing[1];Han, Yi-Fan[1]

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

年份：2021

卷号：617

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20211310134714);WOS:【SCI-EXPANDED(收录号:WOS:000643734500001)】；

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

语种：英文

外文关键词：Pt/gamma-Al2O3; n-heptane aromatization; In-situ characterization; Electronic effect; Pt-Ce catalyst

摘要：Catalytic reforming of n-heptane over a series of Pt-based catalysts modified by Sn and Ce has been conducted in a fixed-bed reactor. Introducing Sn and Ce resulted in changes in the electronic environment of the Pt particles and acidity properties of the gamma-Al2O3 support, causing changes in product distribution. Results from in-situ Diffusion Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), X-ray Photoelectron Spectroscopy (XPS) and density functional theory (DFT) evidenced that the metal promoters altered the metal-support interaction, endowing the generation of negatively charged Pt particles which favored the adsorption of nheptene, a commonly accepted intermediate for n-heptane aromatization. A mechanistic study on the interaction of n-heptene and the Pt clusters with different chemical states based on n-heptene- Temperature Programmed Desorption (TPD) and Density-function theory (DFT) calculations suggested that negatively charged Pt clusters (Pt delta- ) were thermodynamically favorable for the adsorption of n-heptene and its further cyclization step.