Effect of yttrium on catalytic performance of Y-doped TiO_(2) catalysts for propane dehydrogenation

作     者：Liyu Hou Liming Xia Ruipeng Zhou Jianmei Li Renjie Li Zhen Zhao Guimei Yuan Aijun Duan Liyu Hou;Liming Xia;Ruipeng Zhou;Jianmei Li;Renjie Li;Zhen Zhao;Guimei Yuan;Aijun Duan

作者机构：State Key Laboratory of Heavy Oil ProcessingChina University of PetroleumBeijing102249China Institute of Catalysis for Energy and EnvironmentCollege of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang110034China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2024年第42卷第5期

页      面：962-971,I0005页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Project supported by the National Natural Science Foundation of China(22172192,92145301) National Key Research and Development Program(2021YFB3500603) 

主　　题：Propane dehydrogenation Anatase Lattice defects Coordinatively unsaturated Ti cations Oxygen vacancy Rare earths 

摘      要：Defective bulk catalysts based on TiO_(2) have superior catalytic performance for propane dehydrogenation(PDH).The oxygen vacancy concentration and the number of active sites on the catalyst surface can be effectively tuned by doping metal in TiO_(2).Herein,yttrium(Y)-doped titanium dioxide(nY/TiO_(x))catalysts were in-situ synthesized via the coprecipitation method to study the effect of rare earth metal Y doping on the structure of TiO_(2) and the catalytic performance for *** results demonstrate that Ydoped TiO_(2) exhibits higher catalytic activity,propylene selectivity and stability than bare TiO_(2).Full characterizations with X-ray diffraction(XRD),high-resolution transmission electron microscope(HRTEM),X-ray photoelectron spectroscopy(XPS),infrared spectroscopy of pyridine adsorption(Py-IR),temperature-programmed desorption of ammonia(NH_(3)-TPD),H_(2) temperature-programmed reduction(H_2-TPR),and Raman techniques on these catalysts reveal that Y^(3+)can enter TiO_(2) lattice,and the lattice stability of the catalyst can be enhanced by replacing Ti^(4+)to form Y-O-Ti ***,the introduction of an appropriate amount of Y can obviously promote the PDH reaction by adjusting the acidity of the catalyst,improving the release capacity of TiO_(2) lattice oxygen and increasing the formation of active ***,excessive Y doping will lead to pore clogging,and the exposure of active sites will be reduced,resulting in the degradation of catalytic performance.