Thermal stable Pt clusters anchored by K/TiO_(2)—Al_(2)O_(3)for efficient cycloalkane dehydrogenation  

作　　者：Zhendong Wang Bofeng Zhang Guozhu Liu Xiangwen Zhang 

机构地区：[1]Key Laboratory for Green Chemical Technology of the Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]Zhejiang Institute of Tianjin University,Ningbo 315201,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第8期187-198,共12页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(22025802)。

摘　　要：Catalytic dehydrogenation of cycloalkanes is considered a valuable endothermic process for alleviating the thermal barrier issue of hypersonic vehicles.However,conventional Pt-based catalysts often face the severe problem of metal sintering under high-temperature conditions.Herein,we develop an efficient K_(2)CO_(3)-modified Pt/TiO_(2)—Al_(2)O_(3)(K—Pt/TA)for cycloalkane dehydrogenation.The optimized K—Pt/TA showed a high specific activity above 27.9 mol·mol^(-1)·s^(-1)(H_(2)/Pt),with toluene selectivity above 90.0%at 600℃with a high weight hourly space velocity of 266.4 h^(-1).The introduction of alkali metal ions could generate titanate layers after high-temperature hydrogen reduction treatment,which promotes the generation of oxygen vacancy defects to anchored Pt clusters.In addition,the titanate layers could weaken the surface acidity of catalysts and inhibit side reactions,including pyrolysis,polymerization,and isomerization reactions.Thus,this work provides a modification method to develop efficient and stable dehydrogenation catalysts under high-temperature conditions.

关 键 词：Cycloalkane dehydrogenation Pt clusters Oxygen vacancy defects COKING Stability DEACTIVATION 

分 类 号：TQ511[化学工程] O643.36[理学—物理化学]