期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 285, 期 -, 页码 202-214出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2019.05.004
关键词
Hierarchical zeolite; SSZ-13; Pickering emulsion; Phase-transfer; NH3-SCR; Diffusion
类别
资金
- National Natural Science Foundation of China [21878079, 21571128]
- National Excellent Doctoral Dissertation of PR China [201454]
- Shanghai Rising-Star Program [17QA1401700]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2018A14]
Generation of hierarchical zeolites is an effective way to enhance their diffusion-dependent catalytic properties. The fabrication of hierarchical zeolites with enhanced diffusion property, high hydrothermal stability, strong acidity in an inexpensive, facile and efficient way is particularly daunting. Here, a simple synthesis of hierarchical SSZ-13 zeolite in a biphasic water/toluene media under tumbling assisted by organosilane, i.e., trimethoxy[3-(phenylamino)propyl]silane, is proposed. The obtained material with tunable Si/Al from 10 to 30 consists of assembled crystallites of 20-30 nm that construct a hierarchical architecture with mesopores of ca. 7 nm opening to the external facets, and has low defect concentration and preserved strong acidity. Crystallization mechanism is disclosed to obey a non-classic attachment growth of nano building blocks mediated by Pickering emulsion, as organosilane modification changes their surface to be hydrophobic. Such a crystallization pathway has accelerated nucleation process and suppressed the growth of SSZ-13 crystals to micron size. Cu exchanged hierarchical SSZ-13 outperforms the standard sample in typical NH3-SCR process in both low and high temperature regimes as a result of enhanced diffusion property, as well as low defect concentrations. The synthesis is a cost-effective method for the generation of hierarchical zeolites mediated by the presence of a liquid/liquid interface, and could inspire more such explorations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据