Direct Synthesis of Nanosheet-Stacked Hierarchical “Honey Stick-like” MFI Zeolites by an Aromatic Heterocyclic Dual-Functional Organic Structure-Directing Agent |
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Authors: | Risheng Wang Prof Dr Zhihua Peng Prof Dr Pingping Wu Jinzhi Lu Prof Dr Mark J Rood Prof Dr Hongman Sun Prof Dr Jingbin Zeng Prof Dr Youhe Wang Prof Dr Zifeng Yan |
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Institution: | 1. College of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (EastChina), No. 66, Changjiang West Road Qingdao Economic & Technical Development Zone, Qingdao, 266580 Shandong, P. R. China;2. Department of Civil and Environmental Engineering, University of Illinois, 205 North Mathews Avenue, Urbana, Illinois, 61801 United States |
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Abstract: | Soft template designing is the most promising strategy for the synthesis of zeolite nanosheets. MFI nanosheets directed by soft templates (containing long-chain alkyl groups or aromatic groups as hydrophobic component) can be found frequently; however, so far, MFI nanosheets synthesized by soft templates with aromatic heterocycle groups (e. g., s-triazine groups) are rare. Herein, a nanosheet-stacked hierarchical MFI zeolite (NSHM) has been synthesized by using a triply branched s-triazine-based surfactant as a bifunctional organic structure-directing agent. On the basis of a geometrical match relationship, a formation model has been proposed. Synthesized NSHM had abundant mesopores stacked by nanosheets and exhibited a high surface area (430 m2 ⋅ g−1). The 1 wt% Pd/NSHM attained a significant increase in yield of cyclohexanol/cyclohexanone mixture (from 66 to 85 %) in the oxidation of cyclohexane compared with Silicalite-1 and SBA-15 as supports. |
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Keywords: | Heterocycles MFI zeolites nanosheets self-assembly stacking interactions |
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