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

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    [EN] A 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 (C(12)TA(+), C(I6)TA(+), C(18)TA(+)) and TPA(+) both exchanged to their hydroxide forms instead of only one swelling agent (C(n)TA(+) 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 degrees C with C(12)TA(+) preserved layer structure reaching a final disordered/pillared structure while pillared structures are obtained in the case of materials swollen with C(16)TA(+) and C(18)TA(+). Aggressive swelling processes at 80 degrees C favored desilication, damaging the layers structure in case of C(12)TA(+) while pillared materials are obtained after swollen with C(16)TA(+) and C(18)TA(+) 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.Anderson Joel Schwanke is grateful to CAPES Foundation and PDSE program (process number 99999.004779/2014-02) from Ministry of Education of Brazil. U.D and A.C acknowledge to the Spanish Government (Severo Ochoa program SEV-2012-0267 and MAT2014-52085-C2-1-P) and to the Generalitat Valenciana (Prometeo 11/2013-011) by the funding. The European Union is also acknowledged by ERC-AdG-2014-671093 - SynCatMatch.Schwanke, AJ.; Pergher, S.; Díaz Morales, UM.; Corma Canós, A. (2017). The influence of swelling agents molecular dimensions on lamellar morphology of MWW-type zeolites active for fructose conversion. Microporous and Mesoporous Materials. 254:17-27. https://doi.org/10.1016/j.micromeso.2016.11.007S172725
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