Jump to main content
Jump to site search

Issue 8, 2016
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Nov 2015, accepted on 02 Mar 2016 and first published on 03 Mar 2016


Article type: Paper
DOI: 10.1039/C5CY02074C
Citation: Catal. Sci. Technol., 2016,6, 2742-2753

  •   Request permissions

    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

Search articles by author

Spotlight

Advertisements