High field Al-27 MAS NMR and TPD studies of active sites in ethanol dehydration using thermally treated transitional aluminas as catalysts
文献类型：期刊论文
| 作者 | Hu, Jian Zhi2; Xu, Suochang1,2; Kwak, Ja Hun2,3; Hu, Mary Y.2; Wan, Chuan2; Zhao, Zhenchao2; Szanyi, Janos2; Bao, Xinhe1; Han, Xiuwen1; Wang, Yong4 |
| 刊名 | JOURNAL OF CATALYSIS
 |
| 出版日期 | 2016-04-01 |
| 卷号 | 336页码:85-93 |
| 关键词 | Penta-coordinated Alumina Al-27 Mas Nmr High Magnetic Field Tpd |
| ISSN号 | 0021-9517 |
| DOI | 10.1016/j.jcat.2016.01.006 |
| 文献子类 | Article |
| 英文摘要 | High field quantitative Al-27 single pulse (SP) MAS NMR combined with temperature programmed desorption (TPD) of ethanol is used to study the surface of gamma-Al2O3 during phase transformation processes induced by calcination in the temperature range of 500-1300 degrees C. Following ethanol adsorption, ethylene is generated during TPD with a desorption temperature above 200 degrees C. The amount of ethylene decreases monotonically with increasing calcination temperature prior to TPD. Significantly, Al-27 SP MAS NMR reveals that the amount of penta-coordinated Al3+ ions also decreases with increasing calcination temperature. A quantitative (within experimental error) correlation between the amount of penta-coordinated Al3+ ions and the amount of strongly adsorbed ethanol molecules (i.e., the ones that convert to ethylene during TPD) is obtained. These results provide good evidence for a proposal that the penta-coordinated aluminum sites are the catalytic active sites on alumina surfaces during ethanol dehydration reaction across the entire course of gamma-to-alpha Al2O3 phase transformations. (C) 2016 Published by Elsevier Inc. |
| WOS关键词 | PENTACOORDINATED AL3+ IONS ; GAMMA-ALUMINA ; PHASE-TRANSFORMATION ; DELTA-ALUMINA ; GAMMA-AL2O3 ; SURFACE ; MORPHOLOGY ; MECHANISM ; SUPPORT ; ACIDITY |
| WOS研究方向 | Chemistry ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000371944100009 |
| 出版者 | ACADEMIC PRESS INC ELSEVIER SCIENCE |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/171096]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 通讯作者 | Hu, Jian Zhi; Peden, Charles H. F. |
| 作者单位 | 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China 2.Pacific NW Natl Lab, Inst Integrated Catalysis Fundamental & Computat, Richland, WA 99354 USA 3.UNIST, Ulsan 689798, South Korea 4.Washington State Univ, Voiland Sch Chem Engn & Bioengn, Pullman, WA 99163 USA |
| 推荐引用方式 GB/T 7714 | Hu, Jian Zhi,Xu, Suochang,Kwak, Ja Hun,et al. High field Al-27 MAS NMR and TPD studies of active sites in ethanol dehydration using thermally treated transitional aluminas as catalysts[J]. JOURNAL OF CATALYSIS,2016,336:85-93. |
| APA | Hu, Jian Zhi.,Xu, Suochang.,Kwak, Ja Hun.,Hu, Mary Y..,Wan, Chuan.,...&Peden, Charles H. F..(2016).High field Al-27 MAS NMR and TPD studies of active sites in ethanol dehydration using thermally treated transitional aluminas as catalysts.JOURNAL OF CATALYSIS,336,85-93. |
| MLA | Hu, Jian Zhi,et al."High field Al-27 MAS NMR and TPD studies of active sites in ethanol dehydration using thermally treated transitional aluminas as catalysts".JOURNAL OF CATALYSIS 336(2016):85-93. |
入库方式： OAI收割
来源：大连化学物理研究所
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