Effects of K-dopant on structure and activity of KMn/Al2O3 catalysts for CO oxidation: Experimental evidence and DFT calculation
Xie, Xiaopei1; Tang, Qinghu1; Zhang, Jia2; Wang, Jing1; Zhao, Peizheng1; Wang, Yi3; Sullivan, Michael B.2; Yang, Yanhui4
2016-06-25
发表期刊APPLIED CATALYSIS A-GENERAL
ISSN0926-860X
卷号520期号:JUN页码:132-139
摘要KMn/Al2O3 catalysts with different K:Mn molar ratios were synthesized by a facile impregnation method and attempted for CO oxidation. The correlation in between potassium-dopant amount and the structure/catalytic activity of KMn/Al2O3 catalysts were investigated. Doping small amount of potassium (K:Mn mole ratio less than 1:10) to Mn/Al2O3 catalyst efficiently enhanced the catalytic activity of Mn/Al2O3 catalyst. We found that the K1Mn10/Al2O3 catalyst exhibited the best CO oxidation activity with the TOF of 1.5 x 10(-3) s(-1) for 100% CO conversion at 260 degrees C, which is 50 degrees C lower than that on Mn/Al2O3 catalyst. However, excessive amounts of potassium led to beta-to-alpha-MnO2 phase transformation and poor catalytic performance. DFT calculations combined with multiple characterization techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), O-2 temperature-programmed desorption (O-2-TPD) and hydrogen temperature-programmed reduction (H-2-TPR) were performed to provide a deep insight into the K-doping effect. The results suggested that the addition of an appropriate amount of potassium to Mn/Al2O3 catalyst improved the dispersion of manganese oxide, the mobility and reactivity of surface lattice oxygen, thus significantly improved the catalyst activity. (C) 2016 Published by Elsevier B.V.
关键词Co Oxidation Manganese Oxide Potassium Phase Transformation
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine
DOI10.1016/j.apcata.2016.04.015
收录类别SCI
语种英语
关键词[WOS]MANGANESE OXIDE CATALYSTS ; INITIO MOLECULAR-DYNAMICS ; CALCINATION TEMPERATURE ; LATTICE OXYGEN ; ALKALI-METAL ; MNO2 ; CRYPTOMELANE ; ALPHA-MNO2 ; REDUCTION ; MECHANISM
WOS研究方向Chemistry ; Environmental Sciences & Ecology
WOS类目Chemistry, Physical ; Environmental Sciences
项目资助者scientific research key project fund of Department of Education of Henan Province(14A150043) ; Program for Innovative Research Team in Science and Technology in University of Henan Province(15IRTSTHN003) ; National Research Foundation (NRF) ; Campus for Research Excellence and Technological Enterprise (CREATE) program ; AcRF Tier 1 grant(RG129/14) ; Ministry of Education, Singapore, and Agency for Science, Technology and Research (A*STAR), Singapore
WOS记录号WOS:000378369400016
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21168
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Henan Normal Univ, Sch Chem & Chem Engn, Key Lab Green Chem Media & React, Minist Educ, Xinxiang 453007, Peoples R China
2.Agcy Sci Technol & Res, Inst High Performance Comp, Singapore 138632, Singapore
3.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
4.Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore
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Xie, Xiaopei,Tang, Qinghu,Zhang, Jia,et al. Effects of K-dopant on structure and activity of KMn/Al2O3 catalysts for CO oxidation: Experimental evidence and DFT calculation[J]. APPLIED CATALYSIS A-GENERAL,2016,520(JUN):132-139.
APA Xie, Xiaopei.,Tang, Qinghu.,Zhang, Jia.,Wang, Jing.,Zhao, Peizheng.,...&Yang, Yanhui.(2016).Effects of K-dopant on structure and activity of KMn/Al2O3 catalysts for CO oxidation: Experimental evidence and DFT calculation.APPLIED CATALYSIS A-GENERAL,520(JUN),132-139.
MLA Xie, Xiaopei,et al."Effects of K-dopant on structure and activity of KMn/Al2O3 catalysts for CO oxidation: Experimental evidence and DFT calculation".APPLIED CATALYSIS A-GENERAL 520.JUN(2016):132-139.
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