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Title

The influence of swelling agents molecular dimensions on lamellar morphology of MWW-type zeolites active for fructose conversion

AuthorsSchwanke, Anderson Joel; Pergher, Sibele; Díaz Morales, Urbano; Corma, Avelino
KeywordsHierarchical materials
Fructose dehydration
Pillaring
Swelling
MWW zeolites
Issue Date2017
PublisherElsevier
CitationMicroporous and Mesoporous Materials 254: 17-27 (2017)
AbstractA new route to obtain pillared, disordered or desilicated MWW-type zeolites was developed assisted by quaternary ammonium surfactants with different hydrocarbon tail size acting as swelling agents (C12TA+, C16TA+, C18TA+) and TPA+ both exchanged to their hydroxide forms instead of only one swelling agent (CnTA+ or TPA+) in hydroxide form. Effect of surfactant concentration and swelling conditions were determinant to obtain MWW-type zeolites with different lamellar organization and spatial distribution of individual zeolitic layers. Specifically, soft swelling at 25 °C with C12TA+ preserved layer structure reaching a final disordered/pillared structure while pillared structures are obtained in the case of materials swollen with C16TA+ and C18TA+. Aggressive swelling processes at 80 °C favored desilication, damaging the layers structure in case of C12TA+ while pillared materials are obtained after swollen with C16TA+ and C18TA+ surfactants. It was proved that both swelling agents in hydroxide forms combining with swelling and pillaring procedure influenced on physico-chemical and morphological nature of MWW-type materials due to the particular conditions used. The obtained derivative MWW zeolites with different morphology, order and accessibility levels were firstly evaluated by catalytic dehydration of fructose to 5-hydroxymethylfurfural (5-HMF) showing superior activity compared to beta zeolites reported in literature.
Publisher version (URL)https://doi.org/10.1016/j.micromeso.2016.11.007
URIhttp://hdl.handle.net/10261/162219
Identifiersdoi: 10.1016/j.micromeso.2016.11.007
issn: 1387-1811
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