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Issue 8, 2016
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Framework-substituted cerium MCM-22 zeolite and its interlayer expanded derivative MWW-IEZ

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Abstract

Framework-substituted cerium MCM-22 zeolites were synthesized with both TEOS and solid silica sources. The Si/Al ratio in the gel was 15/1 with two different Si/Ce ratios equal to 100/1 and 30/1. The products showed high Brønsted acid site concentrations, above 700 μmol g−1, that diminished slightly as the Ce content increased. The state of Ce was evaluated by IR and UV-vis spectroscopy. There was no indication of a separate Ce phase and extraframework atoms. Both oxidation states, 3+ and 4+, were present. In contrast to the interlayer expanded form MCM-22-IEZ with Ce exchanged into it, the present MCM-22 did not show oxidation of adsorbed CO. This indicates fundamental differences in the location of Ce, which is outside the framework in the exchanged form. The framework-substituted Ce-MCM-22 became active for CO oxidation after its conversion into the IEZ form and additional exchange of Ce. Textural properties were evaluated by nitrogen adsorption and quasi-equilibrated temperature-programmed desorption and adsorption (QE-TPDA) of hydrocarbons.

Graphical abstract: Framework-substituted cerium MCM-22 zeolite and its interlayer expanded derivative MWW-IEZ

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Supplementary files

Article information


Submitted
30 Nov 2015
Accepted
02 Mar 2016
First published
03 Mar 2016

Catal. Sci. Technol., 2016,6, 2742-2753
Article type
Paper

Framework-substituted cerium MCM-22 zeolite and its interlayer expanded derivative MWW-IEZ

W. J. Roth, B. Gil, W. Makowski, A. Sławek, A. Korzeniowska, J. Grzybek, M. Siwek and P. Michorczyk, Catal. Sci. Technol., 2016, 6, 2742
DOI: 10.1039/C5CY02074C

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