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NO2 and N-2 sorption in MFI films with varying Si/Al and Na/Al ratios
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Gadjah Mada University, Yogyakarta.
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2009 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 120, no 3, p. 195-205Article in journal (Refereed) Published
Abstract [en]

MFI crystals or films with controlled thicknesses and different Si/Al ratios were grown on seeded cordierite monoliths using a clear synthesis mixture with template or a template-free gel. The materials were analyzed by scanning electron microscopy, X-ray diffraction, inductively coupled plasma-atomic emission spectrometry, X-ray photoelectron spectroscopy, thermogravimetric analysis and sorption experiments using N2 or NO2 adsorbates. The films were uniformly distributed over the support surface. As expected, the specific monolayer N2 adsorption capacity (mol/gzeolite) was constant and independent of film thickness. The specific molar NO2 adsorption capacity was significantly lower than the specific molar monolayer N2 adsorption capacity, indicating that NO2 is adsorbed at specific sites rather than evenly distributed in a monolayer. A number of NO2 adsorption sites with varying strengths were observed by TPD experiments. At 30 °C, the amount of adsorbed NO2 in the MFI films increased with increasing Al and Na content as opposed to the N2 adsorption capacity, which was independent of these parameters. At 200 °C, the adsorbed amount of NO2 was lower than at 30 °C and apparently independent on Al concentration in the Na-MFI films. These results indicate that different mechanisms are involved in NO2 adsorption. NO2 may adsorb weakly on Na+ cations and also react with silanol groups and residual water in the zeolite, the latter two results in more strongly bound species. Upon NO2 adsorption, formation of NO was observed. This work represents the first systematic study of the effects of Al and Na content on NO2 adsorption in MFI films.

Place, publisher, year, edition, pages
2009. Vol. 120, no 3, p. 195-205
National Category
Chemical Process Engineering
Research subject
Chemical Technology
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URN: urn:nbn:se:ltu:diva-11450DOI: 10.1016/j.micromeso.2008.10.018ISI: 000264971200002Scopus ID: 2-s2.0-60949111945Local ID: a69f8d10-3098-11de-bd0f-000ea68e967bOAI: oai:DiVA.org:ltu-11450DiVA, id: diva2:984400
Note

Validerad; 2009; 20090424 (bajo)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Mosca, AlessandraÖhrman, OlovHedlund, Jonas

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