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Title: Crystallization of amorphous silica to silicalite-1: Effect of nature of silica sources and tetrapropylammonium hydroxide concentration
Authors: Kamil, M S M
Manikandan, K
Elangovan, S P
Ogura, Masaru
Cheralathan, K K
Keywords: Zeolites;Mesoporous materials;Macroporous materials;Silicalite-1;Silica
Issue Date: Apr-2015
Publisher: NISCAIR-CSIR, India
Abstract: Dry gels obtained from different sources of silica such as SBA-15, SBA-16, fumed silica and tetraethyl orthosilicate have been crystallized into silicalite-1 by steam assisted conversion and characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy , nitrogen adsorption, and high resolution scanning electron microscopy. The results show that the nature of source and concentration of tetrapropylammonium hydroxide have a significant effect on shape, size and pore structure of silicalite-1. 29Si MAS NMR spectra of the dry gels obtained from different sources show that Si environment in these gels is similar. However, the morphology of silicalite-1 prepared under same experimental conditions is found to differ for different sources. Further, it is observed that silicalite-1 particles obtained from same source but under different TPAOH concentrations, exhibit different shapes and sizes. N2 adsorption results reveal that the prepared silicalite-1 samples possess a wide pore size distribution and comprise pores in meso- and macro-pore regions, apart from zeolitic micropores.
Page(s): 469-477
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(04) [April 2015]

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