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Template-controlled acidity and catalytic activity of ferrierite crystals

AuthorsPinar, Ana Belén ; Márquez Álvarez, Carlos ; Grande Casas, María Sol ; Pérez Pariente, Joaquín
Zeolite synthesis
Fluoride medium
Al sitting
Acid sites distribution
Issue Date6-Mar-2009
CitationJournal of Catalysis Volume 263, Issue 2, 25 April 2009, Pages 258–265
AbstractA synthesis strategy to tailor the acid sites location in ferrierite crystals has been developed. The zeolite catalysts were synthesised in fluoride medium using different combinations of organic structure directing agents (SDAs) in the absence of inorganic cations. Therefore, the negative charge associated to the incorporation of aluminium to the framework was compensated exclusively by the positive charge of the organic SDAs. In this way, Al sitting in the zeolite framework was driven by the specific location of the different SDA molecules within the zeolite void volume. Following this synthesis strategy, it has been found that the distribution of strongly acidic hydroxyl groups in the proton form of the zeolites obtained after removal of the organic templates was dependent on the combination of organic molecules used as SDAs. Moreover, the catalytic activity of the zeolites in m-xylene and 1-butene isomerisation increased as the relative population of strong Brönsted acid groups in sterically constrained sites inside the ferrierite cavity decreased.
Publisher version (URL)http://dx.doi.org/10.1016/j.jcat.2009.02.017
Appears in Collections:(ICP) Artículos
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