NDLI: A bioscaffolding strategy for hierarchical zeolites with a nanotube-trimodal network

Content Provider	Royal Society of Chemistry (RSC)
Author	Xu, Ruren Li, Shougui Xu, Yan Yu, Bowen Liu, Zhongmin Li, Guannan Wang, Yun Wei, Yingxu Huang, Haibo Tao, Jiawei
Copyright Year	2016
Abstract	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 self-supporting and active zeolite catalysts, and for applications beyond.
Starting Page	1582
Ending Page	1587
Page Count	6
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	7
Issue Number	2
Journal	Chemical Science
DOI	10.1039/c5sc03837e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	BSA MFI Kirkendall Mesoporous material Self-assembly ZSM-5 Macropore Zeolite Porosity
Content Type	Text
Resource Type	Article
Subject	Chemistry

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