Multilamellar and pillared titanium Silicalite-1 with long-range order of zeolite nanosheet layers: Synthesis and catalysis

Titanium silicalite-1 (TS-1) nanosheets can be synthesized from the precursor gels containing a diquaternary ammonium template in hydroxide form. The TS-1 nanosheets tend to form unilamellae interconnected in disordered aggregates. Pillaring of TS-1 nanosheets preserves the mesoporosity, but lacks l...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2019-04, Vol.278, p.414-422
Main Authors: Wu, Wei, Tran, Dat T., Wu, Xianyuan, Oh, Su Cheun, Wang, Manyun, Chen, Huiyong, Emdadi, Laleh, Zhang, Junyan, Schulman, Emily, Liu, Dongxia
Format: Article
Language:English
Subjects:
Cyclooctene epoxidation
Multilamellar TS-1
Phenol hydroxylation
Pillared TS-1
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Summary:Titanium silicalite-1 (TS-1) nanosheets can be synthesized from the precursor gels containing a diquaternary ammonium template in hydroxide form. The TS-1 nanosheets tend to form unilamellae interconnected in disordered aggregates. Pillaring of TS-1 nanosheets preserves the mesoporosity, but lacks long-range order of nanosheet layers. Here, we report synthesis of multilamellar TS-1 (M-TS-1) with long-range order of nanosheet layers from the precursor gels containing hexanediamine (C6DN) and diquaternary ammonium template in bromide form (C22-6-6Br2). Pillaring of M-TS-1 produced pillared TS-1 (P-TS-1) with well-preserved mesoporosity and long-range order of layers. The influences of concentrations of C22-6-6Br2, C6DN, and Ti precursor as well as crystallization time, on the resultant M-TS-1 were investigated. The physicochemical properties of the M-TS-1 and P-TS-1 were studied and compared to the conventional TS-1 zeolite. The presence of mesopores in P-TS-1 enhanced the catalytic performance in reactions involving bulky molecules. [Display omitted] •Multilamellar TS-1 with long-range ordering structure was synthesized from hexanediamine and Gemini-type bromide templates.•Pillared TS-1 with long-range order of zeolite nanosheet layers was achieved.•Influences of concentrations of templates and Ti precursor, crystallization time on the multilamellar TS-1 were investigated.•Mesopores in pillared TS-1 enhanced the Lewis acid sites accessibility and catalytic performance involving bulky molecules.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2019.01.010