Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 254, Issue -, Pages 17-27Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2016.11.007
Keywords
MWW zeolites; Swelling; Pillaring; Hierarchical materials; Fructose dehydration
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Funding
- CAPES Foundation
- PDSE program from Ministry of Education of Brazil [99999.004779/2014-02]
- Spanish Government (Severo Ochoa program) [SEV-2012-0267, MAT2014-52085-C2-1-P]
- Generalitat Valenciana [11/2013-011]
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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. (C) 2016 Elsevier Inc. All rights reserved.
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