Synthesis of nanocrystalline zeolite beta in supercritical fluids, characterization and catalytic activity

Lakshmi Kantam, M. ; Rao, Bhavnari P. C. ; Choudary, B. M. ; Koteswara Rao, K. ; Sreedhar, Bojja ; Iwasawa, Yasuhiro ; Sasak, Takehiko (2006) Synthesis of nanocrystalline zeolite beta in supercritical fluids, characterization and catalytic activity Journal of Molecular Catalysis A: Chemical, 252 (1-2). pp. 76-84. ISSN 1381-1169

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.molcata.2006.02.044

Abstract

Nanocrystalline zeolite beta with Si/Al ratios 12.5-50 has been synthesized by applying a two-stage varying temperature synthesis and supercritical fluid aided crystallization. Low temperature nucleation of clear aluminosilicate gel and SCF aided crystallization gave quantitative yields of nanocrystalline zeolite beta in shorter crystallization time without the use of alkali cations and seeded gel. The obtained nanocrystalline zeolite beta catalysts are thoroughly characterized by X-ray diffraction, N2 adsorption, 29Si and 27Al MAS NMR, IR spectroscopy and Al incorporation in framework was studied by XPS. These nanocrystalline zeolite beta catalysts displayed good activity and high selectivity towards 4-nitro-o-xylene in the nitration of o-xylene when compared to microcrystalline zeolite beta.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Nanocrystalline Zeolite Beta; Supercritical Fluids; Crystallization Time; Nitration; O-xylene; Para-selectivity
ID Code:86044
Deposited On:07 Mar 2012 13:47
Last Modified:07 Mar 2012 13:47

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