A bioscaffolding strategy for hierarchical zeolites with a nanotube-trimodal network† †Electronic supplementary information (ESI) available: SEM, TEM, XRD, FTIR, TG, EDS, XPS, UV spectrum, N2 sorption isotherm, NH3-TPD, Hg intrusion porosimetry, MTH conversion and product selectivity. See DOI: 10.1039/c5sc03837e Click here for additional data file.

نویسندگان

  • Guannan Li
  • Haibo Huang
  • Bowen Yu
  • Yun Wang
  • Jiawei Tao
  • Yingxu Wei
  • Shougui Li
  • Zhongmin Liu
  • Yan Xu
  • Ruren Xu
چکیده

Hierarchical zeolite monoliths with multimodal porosity are of paramount importance as they open up new horizons for advanced applications. So far, hierarchical zeolites based on nanotube scaffolds have never been reported. Inspired by the organization of biominerals, we have developed a novel precursor scaffolding-solid phase crystallization strategy for hierarchical zeolites with a unique nanotube scaffolding architecture and nanotube-trimodal network, where biomolecular self-assembly (BSA) provides a scaffolding blueprint. By vapor-treating Sil-1 seeded precursor scaffolds, zeolite MFI nanotube scaffolds are self-generated, during which evolution phenomena such as segmented voids and solid bridges are observed, in agreement with the Kirkendall effect in a solid-phase crystallization system. The nanotube walls are made of intergrown single crystals rendering good mechanical stability. The inner diameter of the nanotube is tunable between 30 and 90 nm by varying the thickness of the precursor layers. Macropores enclosed by cross-linked nanotubes can be modulated by the choice of BSA. Narrow mesopores are formed by intergrown nanocrystals. Hierarchical ZSM-5 monoliths with nanotube (90 nm), micropore (0.55 nm), mesopore (2 nm) and macropore (700 nm) exhibit superior catalytic performance in the methanol-to-hydrocarbon (MTH) conversion compared to conventional ZSM-5. BSA remains intact after crystallization, allowing a higher level of organization and functionalization of the zeolite nanotube scaffolds. The current work may afford a versatile strategy for hierarchical zeolite monoliths with nanotube scaffolding architectures and a nanotube-multimodal network leading to selfsupporting and active zeolite catalysts, and for applications beyond.

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منابع مشابه

Amorphous cobalt silicate nanobelts@carbon composites as a stable anode material for lithium ion batteries† †Electronic supplementary information (ESI) available: Experimental details, AFM images, XRD patterns, SEM images, SEM-EDX element mapping, TEM images, Raman spectrum, TGA analysis, IR spectra, electrochemical characterization and N2 gas sorption measurements. See DOI: 10.1039/c5sc02525g Click here for additional data file.

Laboratory for Multifunctional Materials, Vladimir-Prelog-Weg 5, 8093 Zurich, Swi mat.ethz.ch Electron Microscopy Center, Empa, Swiss F and Technology, Überlandstrasse 129, 8600 Laboratory for Nanometallurgy, Departmen Switzerland Department of Chemistry and Applied Switzerland † Electronic supplementary information AFM images, XRD patterns, SEM imag images, Raman spectrum, TGA an characterizat...

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عنوان ژورنال:

دوره 7  شماره 

صفحات  -

تاریخ انتشار 2016