Issue 40, 2023

Cation-induced speciation of port-size during mordenite zeolite synthesis

Abstract

Mordenite (MOR) zeolite, an important industrial catalyst exists in two, isostructural variants defined by their port-size, small and large-port. Here we show for the first time how a systematic, single-parameter variation influences the synthesis out-come on the final MOR material leading to distinctly different catalysts. The cation identity has a direct impact on the synthesis mechanism with potassium cations generating the more constrained, small-port MOR variant compared to the large-port obtained with sodium cations. This was expressed by different degrees of accessibility ascertained with a combination of toluene breakthrough and temperature programmed desorption (TPD), propylamine TPD, as well as sterically sensitive isobutane conversion. Rietveld refinement of the X-ray diffractograms elucidated the preferential siting of the smaller sodium cations in the constricted 8-ring, from which differences in Al distribution follow. Note, there are no organic structure directing agents utilized in this synthesis pointing at the important role of inorganic structure directing agents (ISDA).

Graphical abstract: Cation-induced speciation of port-size during mordenite zeolite synthesis

  • This article is part of the themed collection: #MyFirstJMCA

Supplementary files

Article information

Article type
Paper
Submitted
11 Jūn. 2023
Accepted
27 Sept. 2023
First published
28 Sept. 2023
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2023,11, 21884-21894

Cation-induced speciation of port-size during mordenite zeolite synthesis

S. Prodinger, I. C. Berdiell, T. Cordero-Lanzac, O. R. Bygdnes, B. G. Solemsli, K. Kvande, B. Arstad, P. Beato, U. Olsbye and S. Svelle, J. Mater. Chem. A, 2023, 11, 21884 DOI: 10.1039/D3TA03444E

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