Issue 4, 2016

One-pot synthesis of novel hierarchical bifunctional Ga/HZSM-5 nanosheets for propane aromatization

Abstract

Hierarchical galloaluminosilicate nanosheets with the MFI structure have been successfully prepared by a one-pot hydrothermal process. Tetrabutylphosphonium hydroxide (TBPOH), a dual structure-directing agent (SDA), was used to simultaneously produce the MFI structure and the self-assemblies of nanolayers. The as-synthesized samples were characterized by means of XRD, TEM, SEM, EDS, ICP, 27Al MAS NMR, H2-TPR, NH3-TPD and N2 physisorption. The galloaluminosilicate nanosheets exhibit outstanding properties, such as an extremely high meso/macroporosity (one to two orders of magnitude higher compared with the conventional zeolite), a uniform Si, Al and Ga distribution, along with the appropriate acidic properties. The galloaluminosilicate nanosheets can greatly enhance the catalytic performances in terms of activity (60 and 20% for propane conversion over the hierarchical Ga/HZSM-5 and the conventional zeolite, respectively), BTX selectivity (almost three times higher compared with the conventional zeolite), and significant reduction of deposited coke (approximately by 70%) for conversion of propane at 823 K under atmospheric pressure without any special pretreatments of catalysts. This first example demonstrates a simple and low-cost approach for the synthesis of hierarchical bifunctional zeolite nanosheets and the challenge for the development of heterogeneous catalysts.

Graphical abstract: One-pot synthesis of novel hierarchical bifunctional Ga/HZSM-5 nanosheets for propane aromatization

Supplementary files

Article information

Article type
Paper
Submitted
29 Oct 2015
Accepted
18 Dec 2015
First published
22 Dec 2015

RSC Adv., 2016,6, 2875-2881

Author version available

One-pot synthesis of novel hierarchical bifunctional Ga/HZSM-5 nanosheets for propane aromatization

W. Wannapakdee, C. Wattanakit, V. Paluka, T. Yutthalekha and J. Limtrakul, RSC Adv., 2016, 6, 2875 DOI: 10.1039/C5RA22707K

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