Issue 34, 2013

Characterization of layered silicate HUS-5 and formation of novel nanoporous silica through transformation of HUS-5 ion-exchanged with alkylammonium cations

Abstract

Hiroshima University Silicate-1 (HUS-1) and its precursor (HUS-5), whose crystal structure was similar to that of β-HLS layered silicate, were prepared. The interlayer distance of HUS-5 was 0.4 nm; both Na+ cations and hydrated water were present in the interlayer. The interlayer distance of HUS-5 was expanded by ion-exchanging with several bulky organic cations such as dodecyltrimethylammonium, hexadecyltrimethylammonium, and benzyltrimethylammonium. The HUS-5 variants that were ion-exchanged with alkylammonium exhibited high catalytic activities base catalysts in a Knoevenagel condensation reaction. In particular, the HUS-5 that was ion-exchanged with hexadecyltrimethylammonium cations was converted to novel nanoporous silica by acetic acid treatment and subsequent calcination and was named HUS-6. The BET surface area and average pore diameter were 983 m2 g−1 and 1.6 nm, respectively. Formation of nanopores in HUS-6 was clearly confirmed by TEM. Nanopores (ca. 1.6 nm) of HUS-6 present a unique adsorption space; there was an intermediate state between micropores (ca. 0.6 nm) of silicalite-1 and mesopores (ca. 2.9 nm) of MCM-41.

Graphical abstract: Characterization of layered silicate HUS-5 and formation of novel nanoporous silica through transformation of HUS-5 ion-exchanged with alkylammonium cations

Supplementary files

Article information

Article type
Paper
Submitted
19 Maa 2013
Accepted
25 Juu 2013
First published
26 Juu 2013

J. Mater. Chem. A, 2013,1, 9680-9688

Characterization of layered silicate HUS-5 and formation of novel nanoporous silica through transformation of HUS-5 ion-exchanged with alkylammonium cations

N. Tsunoji, M. Fukuda, K. Yoshida, Y. Sasaki, T. Ikeda, Y. Ide, M. Sadakane and T. Sano, J. Mater. Chem. A, 2013, 1, 9680 DOI: 10.1039/C3TA11971H

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