文献类型：期刊文献

中文题名：氢气对不同粒径Pt/Al_(2)O_(3)催化丙烷脱氢反应性能的影响

英文题名：Effect of Hydrogen on the Performance of Propane Dehydrogenation over Pt/Al_(2)O_(3) with Different Particle Sizes

作者：单奇彬[1];姜嘉伟[1];丁森[1];许彪[1];隋志军[1];周兴贵[1]

机构：[1]华东理工大学化学工程国家重点实验室,上海200237

年份：2020

卷号：36

期号：4

起止页码：307

中文期刊名：化学反应工程与工艺

外文期刊名：Chemical Reaction Engineering and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；

语种：中文

中文关键词：氢气;Pt/Al_(2)O_(3);负载催化剂;丙烷脱氢;催化剂粒径

外文关键词：hydrogen;Pt/Al_(2)O_(3) catalyst;propane dehydrogenation;catalyst particle size

摘要：氢气浓度是Pt基催化剂上丙烷脱氢工艺的重要操作参数,对于过程产率和催化剂寿命具有重要影响。本研究以γ-Al_(2)O_(3)为载体制备了两种不同粒径的催化剂,采用N2物理吸附、CO化学吸附和高角环形暗场-扫描透射电子显微镜(HAADF-STEM)对催化剂结构进行了表征。考察了氢气对于不同粒径Pt催化剂催化性能的影响,并采用拉曼、热重分析和元素分析表征了反应后催化剂的结焦性质,研究了氢气对丙烷脱氢反应的调控作用。结果表明:进料中氢气的引入均能够有效地提升催化活性,且能够抑制结焦,降低反应后催化剂积炭的石墨化程度;但不同粒径的催化剂存在不同的最优引入氢气配比,使得反应中丙烯生成速率达到最大,结焦指数达到最小。
Hydrogen concentration is a key operating parameter of propane dehydrogenation process over Pt-based catalyst,which has an important influence on the yield and catalyst life.In this work,γ-Al_(2)O_(3) was used as the carrier to prepare two kinds of Pt catalysts with different particle sizes.The structures of catalysts were characterized by N2 adsorption,CO chemical adsorption and high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM).The effect of hydrogen on the catalytic performance of Pt-catalysts was investigated.And the coke accumulated on the catalysts after reaction were characterized by Raman,thermogravimetric and elemental analysis to explore the effect of hydrogen on the coke properties.The results showed that introducing hydrogen into the feed improved the catalytic activity,suppressed coke reactions and decreased the graphitizing extent of coke for both of the catalysts.But,the optimal molar ratios of H2 to C3H8 were required over the catalysts with different particle sizes for maximizing the propylene generation rate and minimizing the coking producing rate.