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dc.contributor.authorValadares, Deborah da Silva-
dc.contributor.authorClemente, Maria Clara Hortêncio-
dc.contributor.authorFreitas, Elon Ferreira de-
dc.contributor.authorMartins, Gesley Alex Veloso-
dc.contributor.authorDias, José Alves-
dc.contributor.authorDias, Silvia Clara Loureiro-
dc.date.accessioned2020-07-24T22:08:25Z-
dc.date.available2020-07-24T22:08:25Z-
dc.date.issued2020-
dc.identifier.citationVALADARES, Deborah S. et al. Niobium on BEA dealuminated zeolite for high selectivity dehydration reactions of ethanol and xylose into diethyl ether and furfural. Nanomaterials, v. 10, n. 7, 2020. DOI: https://doi.org/10.3390/nano10071269. Disponível em: https://www.mdpi.com/2079-4991/10/7/1269.pt_BR
dc.identifier.urihttps://repositorio.unb.br/handle/10482/39298-
dc.language.isoInglêspt_BR
dc.publisherMDPIpt_BR
dc.rightsAcesso Abertopt_BR
dc.titleNiobium on BEA dealuminated zeolite for high selectivity dehydration reactions of ethanol and xylose into diethyl ether and furfuralpt_BR
dc.typeArtigopt_BR
dc.subject.keywordZeólitaspt_BR
dc.subject.keywordNióbiopt_BR
dc.subject.keywordDesidratação de etanolpt_BR
dc.subject.keywordÉter Dietílicopt_BR
dc.subject.keywordXilosept_BR
dc.subject.keywordFurfuralpt_BR
dc.rights.license© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).pt_BR
dc.identifier.doihttps://doi.org/10.3390/nano10071269pt_BR
dc.description.abstract1: In this work, we investigated the role of solid-state dealumination by (NH4)2SiF6 (25% Al removal and 13% Si insertion), the impregnation of niobium (10, 18, and 25 wt. %) on dealuminated *BEA (DB) zeolite and their catalytic properties in ethanol and xylose transformations. Among all the studied catalysts, 18%Nb-DB showed increased mesoporosity and external areas. A leveling effect in the number and strength of the proposed two sites (Brønsted and Lewis) present in the catalyst (n1 = 0.24 mmol g−1 , −∆H1 = 49 kJ mol−1 , and n2 = 0.20 mmol g−1 , –∆H2 = 42 kJ mol−1 ) in the catalyst 18%Nb-DB, might be responsible for its good activity. This catalyst presented the highest selectivity for diethyl ether, DEE (97%) with 61% conversion after 50 ethanol pulses at 230 ◦C (turnover number, TON DEE = 1.15). These features allowed catalytically fruitful bonding of the ethanol molecules to the neighboring sites on the channels, facilitating bimolecular ether formation through a possible SN2 mechanism. The same catalyst was active and selective for transformation of xylose at 180 ◦C, showing 64% conversion and 51% selectivity for furfural (TON Furfural = 24.7) using water as a green solvent.pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-4622-2445pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0042-0091pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-3351-9226pt_BR
dc.description.unidadeInstituto de Química (IQ)pt_BR
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