|
|||||
|
|
ECNU-13: A High-Silica Zeolite with Three-Dimensional and High-Connectivity Multi-Pore Structures for Selective Alkene Cracking |
|
| Authors: | Mingming Peng Quanzheng Deng Yuhong Zhao Prof. Hao Xu Prof. Yejun Guan Dr. Jingang Jiang Prof. Lu Han Prof. Peng Wu |
| Affiliation: | 1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Road 3663, 200062 Shanghai, China Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, 184-8588 Tokyo Japan These authors contributed equally to this work.;2. School of Chemical Science and Engineering, Tongji University, Siping Road 1239, 200092 Shanghai, China These authors contributed equally to this work.;3. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Road 3663, 200062 Shanghai, China These authors contributed equally to this work.;4. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Road 3663, 200062 Shanghai, China Institute of Eco-Chongming, 202162 Shanghai, China;5. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Road 3663, 200062 Shanghai, China;6. School of Chemical Science and Engineering, Tongji University, Siping Road 1239, 200092 Shanghai, China |
| Abstract: | A high-silica zeolite ECNU-13 (Si/Al=23) with a new three-dimensional (3D) pore system and a nanosized morphology has been developed, consisting of multitudes of 10-membered ring (10-R) medium pores and one set of 8-R small pores. A phase-discrimination strategy was proposed to synthesize ECNU-13 by regulating the gel compositions and nucleation processes that were used for preparing 12-R large-pore germanosilicate IM-20 with the known UWY topology. The crystallization was directed towards forming one set of single four-ring (s4r) composite building units together with one set of double four-ring (d4r) rather than two different types of d4r units in IM-20. The electron crystallographic investigations elucidated that the ECNU-13 structure was composed of two kinds of polymorphs as a result of distinct atomic positionings in s4r units. In catalytic cracking of 1-butene, ECNU-13 exhibited high propene selectivity (55.6 %) and propene to ethylene molar ratio (>4.7) superior to well-studied conventional ZSM-5 zeolite catalyst. |
| Keywords: | ECNU-13 Heterogeneous Catalysts Olefin Cracking Small and Medium Pores Zeolites |