Issue 5, 2016

Accelerated synthesis of Sn-BEA in fluoride media: effect of H2O content in the gel

Abstract

Tin-containing zeotypes, particularly Sn-BEA, are promising heterogeneous catalysts for a number of important industrially relevant reactions. However, the direct hydrothermal synthesis of these materials requires unfavourably long times, which is an obstacle for their industrial application. In the present study we show that up to 4-fold reduction of the crystallization time can be achieved by a decrease of the H2O/SiO2 ratio in the synthesis gel from 7.5 to 5.6. The crystallization kinetics has been studied for five series of gels containing 1.0SiO2 : 0.27TEA2O : xSnO2 : 0.54HF : yH2O, for which y was fixed to 5.6, 6.8 and 7.5 at x = 0.005 and to 5.6 and 6.8 at x = 0.010. The crystallization time was varied within 0.5–60 days. The intermediate and final products obtained were investigated using XRD, FTIR, XRF, SEM, UV-Vis, MAS NMR spectroscopy and nitrogen adsorption–desorption techniques. The products obtained with lower water content are shown to have the same structure, textural properties and morphology as materials synthesized with higher water content. Although the size of the crystals is found to decrease with water content in the gel, it does not affect the Sn coordination and environment as confirmed by 119Sn MAS NMR.

Graphical abstract: Accelerated synthesis of Sn-BEA in fluoride media: effect of H2O content in the gel

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2016
Accepted
25 Mar 2016
First published
28 Mar 2016

New J. Chem., 2016,40, 4367-4374

Accelerated synthesis of Sn-BEA in fluoride media: effect of H2O content in the gel

A. V. Yakimov, Y. G. Kolyagin, S. Tolborg, P. N. R. Vennestrøm and I. I. Ivanova, New J. Chem., 2016, 40, 4367 DOI: 10.1039/C6NJ00394J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements