Direct observation of the mesopores in ZSM-5 zeolites with hierarchical porous structures by laser-hyperpolarized Xe-129 NMR
文献类型：期刊论文
| 作者 | Liu, Yong1; Zhang, Weiping1; Liu, Zhicheng2; Xu, Shutao1; Wang, Yangdong2; Xie, Zaiku2; Han, Xiuwen1; Bao, Xinhe1 |
| 刊名 | journal of physical chemistry c
 |
| 出版日期 | 2008-10-02 |
| 卷号 | 112期号:39页码:15375-15381 |
| 英文摘要 | mesopore-modified zsm-5 zeolites with hierarchical porous structures (meso-zsm-5) have been synthesized by using tetrapropylammonium hydroxide and starch as cotemplates. one- and two-dimensional xe-129 nmr spectroscopy has been employed to study the porosity under the continuous flow of laser-hyperpolarized xenon gas. besides the micropores, the mesoporous domains in meso-zsm-5 zeolites are directly observed by variable-temperature experiments. combining with nitrogen adsorption, the influence of the si/al ratios on the mesopores in meso-zsm-5 is also investigated. the exchange of xe atoms in different types of pores is very fast at ambient temperature. two-dimensional exchange spectroscopy (exsy) is used for the first time to monitor such an exchange process, and the results indicate that even at very low temperature xe atoms still undergo much faster exchange between mesopores and micropores in meso-zsm-5 than in the mechanical mixture of conventional zsm-5 and mesoporous silica. the results demonstrate that these hierarchical pores may have good connected networks that facilitate xenon diffusion and exchange. also, this may give some indications for other molecules adsorption and diffusion in mesoporous zeolites especially in the process of catalysis. |
| WOS标题词 | science & technology ; physical sciences ; technology |
| 类目[WOS] | chemistry, physical ; nanoscience & nanotechnology ; materials science, multidisciplinary |
| 研究领域[WOS] | chemistry ; science & technology - other topics ; materials science |
| 关键词[WOS] | nanosized hzsm-5 zeolite ; solid-state nmr ; single-crystals ; microporous structure ; polarized xenon ; spectroscopy ; diffusion ; catalysts ; aluminosilicate ; decomposition |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000259552200046 |
| 公开日期 | 2015-11-17 |
| 源URL | [http://159.226.238.44/handle/321008/141026]  |
| 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.SINOPEC Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Yong,Zhang, Weiping,Liu, Zhicheng,et al. Direct observation of the mesopores in ZSM-5 zeolites with hierarchical porous structures by laser-hyperpolarized Xe-129 NMR[J]. journal of physical chemistry c,2008,112(39):15375-15381. |
| APA | Liu, Yong.,Zhang, Weiping.,Liu, Zhicheng.,Xu, Shutao.,Wang, Yangdong.,...&Bao, Xinhe.(2008).Direct observation of the mesopores in ZSM-5 zeolites with hierarchical porous structures by laser-hyperpolarized Xe-129 NMR.journal of physical chemistry c,112(39),15375-15381. |
| MLA | Liu, Yong,et al."Direct observation of the mesopores in ZSM-5 zeolites with hierarchical porous structures by laser-hyperpolarized Xe-129 NMR".journal of physical chemistry c 112.39(2008):15375-15381. |
入库方式： OAI收割
来源：大连化学物理研究所
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