Fabricating PdCe/OMS-2 catalysts with boosted low-temperature activity for toluene deep degradation

作     者：Lin Yue Zhihua Xu Minghua Hu Mingjiao Tian Mudi Ma Bijie Huang Chi He Lin Yue;Zhihua Xu;Minghua Hu;Mingjiao Tian;Mudi Ma;Bijie Huang;Chi He

作者机构：State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Precision Blasting and Hubei Key Laboratory of Industrial Fume and Dust Pollution ControlJianghan UniversityWuhan 430056China National Engineering Laboratory for VOCs Pollution Control Material&TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China 

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

年 卷 期：2023年第41卷第6期

页      面：839-849,I0002页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(21876139,21922606,21407062) the Excellent Youth Foundation of Hubei Province of China(2019CFA078) Outstanding Youth Science and Technology Innovation Team Project for Colleges and Universities of Hubei Province(T2021036) the Hubei Provincial Natural Science Foundation of China(2019CFB578) 

主　　题：PdCe/OMS-2 Toluene Catalytic oxidation Oxygen vacancy Rare earths 

摘      要：Porous cryptomelane-type octahedral molecular sieve(OMS-2)with mixed Mn valence and abundant lattice oxygen species has attracted much attention in volatile organic compounds(VOC)catalytic ***,complete conversion of arene over OMS-2 catalysts at relatively low temperature is still a challenge due to its limited crystal structure and inferior ***,a series of PdCe/OMS-2 catalysts with different Pd/Ce molar ratios was fabricated by a facile impregnation method and the physicochemical properties of which were extensively characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HR-TEM),B runauer-Emmett-Teller(BET)method,X-ray fluorescence(XRF),X-ray photoelectron spectroscopy(XPS),temperature programmed reduction of H2(H2-TPR),Raman,In situ diffused reflectance infrared Fourier transform spectra(DRIFTS),and density functional theory(DFT)*** show that the total conversion of toluene can be achieved at 207℃ over PdCe2 with apparent activation energy as low as 62.6 kJ/*** strong synergistic effect between Pd and Ce remarkably boosts the catalytic activity of OMS-2,attributed to the abundant Mn^(3+)-O bands and active surface oxygen *** results reveal that oxygen vacancy can be formed over PdCe2 much easily than that of Pd/OMS-2 and Ce/OMS-2 with the oxygen vacancy formation energy of2.42,2.83 and 2.68 eV,*** increasing the Pd content cannot promote the catalytic activity although PdO is a critical active center in toluene *** vacancy attributed to the integrative effect of Pd,Ce and Mn species plays a promine nt role over prepared catalysts in toluene activation *** findings reported in this work showed new insights into the designing of highly efficient OMS-2catalysts for VOC deep oxidation by tuning oxygen vacancy concentration.