| Campo DC | Valor | Idioma |
|---|
| dc.contributor.author | Valadares, Deborah da Silva | - |
| dc.contributor.author | Clemente, Maria Clara Hortêncio | - |
| dc.contributor.author | Freitas, Elon Ferreira de | - |
| dc.contributor.author | Martins, Gesley Alex Veloso | - |
| dc.contributor.author | Dias, José Alves | - |
| dc.contributor.author | Dias, Silvia Clara Loureiro | - |
| dc.date.accessioned | 2020-07-24T22:08:25Z | - |
| dc.date.available | 2020-07-24T22:08:25Z | - |
| dc.date.issued | 2020 | - |
| dc.identifier.citation | VALADARES, 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.uri | https://repositorio.unb.br/handle/10482/39298 | - |
| dc.language.iso | Inglês | pt_BR |
| dc.publisher | MDPI | pt_BR |
| dc.rights | Acesso Aberto | pt_BR |
| dc.title | Niobium on BEA dealuminated zeolite for high selectivity dehydration reactions of ethanol and xylose into diethyl ether and furfural | pt_BR |
| dc.type | Artigo | pt_BR |
| dc.subject.keyword | Zeólitas | pt_BR |
| dc.subject.keyword | Nióbio | pt_BR |
| dc.subject.keyword | Desidratação de etanol | pt_BR |
| dc.subject.keyword | Éter Dietílico | pt_BR |
| dc.subject.keyword | Xilose | pt_BR |
| dc.subject.keyword | Furfural | pt_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.doi | https://doi.org/10.3390/nano10071269 | pt_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.orcid | https://orcid.org/0000-0003-4622-2445 | pt_BR |
| dc.identifier.orcid | https://orcid.org/0000-0003-0042-0091 | pt_BR |
| dc.identifier.orcid | https://orcid.org/0000-0002-3351-9226 | pt_BR |
| dc.description.unidade | Instituto de Química (IQ) | pt_BR |
| Aparece nas coleções: | Artigos publicados em periódicos e afins
|
