Effects of K-dopant on structure and activity of KMn/Al2O3 catalysts for CO oxidation: Experimental evidence and DFT calculation
文献类型：期刊论文
| 作者 | Xie, Xiaopei1; Tang, Qinghu1; Zhang, Jia2; Wang, Jing1; Zhao, Peizheng1; Wang, Yi3; Sullivan, Michael B.2; Yang, Yanhui4 |
| 刊名 | APPLIED CATALYSIS A-GENERAL
 |
| 出版日期 | 2016-06-25 |
| 卷号 | 520期号:JUN页码:132-139 |
| 关键词 | CO oxidation Manganese oxide Potassium Phase transformation |
| ISSN号 | 0926-860X |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine |
| 类目[WOS] | Chemistry, Physical ; Environmental Sciences |
| 研究领域[WOS] | Chemistry ; Environmental Sciences & Ecology |
| 关键词[WOS] | MANGANESE OXIDE CATALYSTS ; INITIO MOLECULAR-DYNAMICS ; CALCINATION TEMPERATURE ; LATTICE OXYGEN ; ALKALI-METAL ; MNO2 ; CRYPTOMELANE ; ALPHA-MNO2 ; REDUCTION ; MECHANISM |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000378369400016 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/21168]  |
| 专题 | 过程工程研究所_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 |
| 推荐引用方式 GB/T 7714 | 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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来源：过程工程研究所
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