MAS NMR studies of modified HY zeolites
文献类型：期刊论文
| 作者 | Li, WL; Wang, Y; Tan, ZY; Bao, XH |
| 刊名 | chinese science bulletin
 |
| 出版日期 | 2000-02-01 |
| 卷号 | 45期号:4页码:325-330 |
| 关键词 | HY zeolite MAS NMR modification acidic site loading |
| 英文摘要 | the variations in structure and acidity on the internal and external surfaces of hy zeolites modified by mgo and sio2 have been studied by mas nmr, together with the selective adsorption of perfluorotributyl-amine. al-27 and si-29 mas nmr spectra revealed that the modifications led to significant changes of the framework owing to the migration of some non-framework si and al into the framework in the course of the modifications. h-1 mas nmr spectra showed that the modifications decreased the acidity of the zeolite surfaces. with an increasing of the loading of the oxides, the acidity of the surface decreased further. both of the two kinds of bronsted acidity of the mgo-modified hy zeolites decreased, particularly those in the supercages, while those of the sio2-modified hy zeolites decreased less, and this result is consistent with that of nh3-tpd, from the adsorption of perfluorotributyl-amine, it was found that the acidic sites on the external surface of the hy zeolite can be completely covered by sio2 after being modified by the chemical liquid deposition (cld) method. |
| WOS标题词 | science & technology |
| 类目[WOS] | multidisciplinary sciences |
| 研究领域[WOS] | science & technology - other topics |
| 关键词[WOS] | temperature-programmed desorption ; bronsted-acid ; spectroscopy ; catalysts ; ammonia ; sites |
| 收录类别 | SCI |
| 原文出处 | true |
| 语种 | 英语 |
| WOS记录号 | WOS:000085980600007 |
| 公开日期 | 2010-11-30 |
| 源URL | [http://159.226.238.44/handle/321008/85053]  |
| 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 |
| 作者单位 | 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China 2.Liaoning Normal Univ, Dept Chem, Dalian 116029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, WL,Wang, Y,Tan, ZY,et al. MAS NMR studies of modified HY zeolites[J]. chinese science bulletin,2000,45(4):325-330. |
| APA | Li, WL,Wang, Y,Tan, ZY,&Bao, XH.(2000).MAS NMR studies of modified HY zeolites.chinese science bulletin,45(4),325-330. |
| MLA | Li, WL,et al."MAS NMR studies of modified HY zeolites".chinese science bulletin 45.4(2000):325-330. |
入库方式： OAI收割
来源：大连化学物理研究所
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