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Issue 38, 2015
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Unseeded hydroxide-mediated synthesis and CO2 adsorption properties of an aluminosilicate zeolite with the RTH topology

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Abstract

We have synthesized an aluminosilicate RTH-type zeolite with Si/Al = 10 using 1,2,3-trimethylimidazolium (123TMI+) as an organic structure-directing agent (OSDA) together with Na+ or K+ in hydroxide media and without the use of seed crystals. The zeolite obtained is characterized by a cuboid morphology made of very small ill-defined crystallites, largely different from the plank-like morphology typically observed for RTH-type zeolite crystals thus far. More interestingly, we show experimental evidence demonstrating that two 123TMI+ ions are located within each [46586484] cavity of the RTH framework, forming antiparallel dimers, as found by Rietveld refinement. When hydrothermally aged at 1023 K, Cu-RTH is much less active for NO reduction with NH3 than Cu-SSZ-13, the best catalyst known for this reaction to date. However, while the CO2 uptake (3.2 mmol g−1) on Na-RTH at 298 K and 1.0 bar is lower than that (4.5 mmol g−1) on zeolite Na-Rho, a well-studied small-pore zeolite that selectively adsorbs CO2, it exhibits much faster CO2 sorption kinetics. This renders our RTH zeolite potentially useful as a selective CO2 adsorbent.

Graphical abstract: Unseeded hydroxide-mediated synthesis and CO2 adsorption properties of an aluminosilicate zeolite with the RTH topology

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Supplementary files

Article information


Submitted
14 May 2015
Accepted
16 Jun 2015
First published
16 Jun 2015

J. Mater. Chem. A, 2015,3, 19322-19329
Article type
Paper
Author version available

Unseeded hydroxide-mediated synthesis and CO2 adsorption properties of an aluminosilicate zeolite with the RTH topology

D. Jo, J. B. Lim, T. Ryu, I. Nam, M. A. Camblor and S. B. Hong, J. Mater. Chem. A, 2015, 3, 19322
DOI: 10.1039/C5TA03559G

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