Synthesis, characterization, and application of phosphotungstic acid  supported on iron-based magnetic nanoparticles coated with silica

Paiva, Mateus Freitas; Diab, Gabriel Ali Atta; Mendonça, Estelle Silva Diorato Teixeira de; Dias, Sílvia Cláudia Loureiro; Dias, José Alves

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Campo DC	Valor	Idioma
dc.contributor.author	Paiva, Mateus Freitas	-
dc.contributor.author	Diab, Gabriel Ali Atta	-
dc.contributor.author	Mendonça, Estelle Silva Diorato Teixeira de	-
dc.contributor.author	Dias, Sílvia Cláudia Loureiro	-
dc.contributor.author	Dias, José Alves	-
dc.date.accessioned	2022-06-08T11:03:36Z	-
dc.date.available	2022-06-08T11:03:36Z	-
dc.date.issued	2021-07-14	-
dc.identifier.citation	PAIVA, Mateus Freitas et al. Synthesis, characterization, and application of phosphotungstic acid supported on iron-based magnetic nanoparticles coated with silica. Catalysis Today, v. 394-396, p. 425-433, 1 jul. 2022. DOI: https://doi.org/10.1016/j.cattod.2021.06.032.	pt_BR
dc.identifier.uri	https://repositorio.unb.br/handle/10482/43908	-
dc.language.iso	Português	pt_BR
dc.publisher	Elsevier B. V.	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Synthesis, characterization, and application of phosphotungstic acid supported on iron-based magnetic nanoparticles coated with silica	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Nanopartículas magnéticas	pt_BR
dc.subject.keyword	Magnetita	pt_BR
dc.subject.keyword	Sílica	pt_BR
dc.subject.keyword	Ácido fosfotungstico	pt_BR
dc.subject.keyword	Esterificação	pt_BR
dc.subject.keyword	Ácido oléico	pt_BR
dc.identifier.doi	https://doi.org/10.1016/j.cattod.2021.06.032	pt_BR
dc.relation.publisherversion	https://www.sciencedirect.com/science/article/pii/S0920586121003163?via%3Dihub	pt_BR
dc.description.abstract1	Magnetic nanoparticles based on magnetite (MNP) are important materials for different research applications, particularly when they are coated with inert phases. For instance, coating them with silica forms MNP@SiO2, which has various uses, including as a support for catalysts because it has surface functional groups that form bonds to a coating layer; the material presents itself with high magnetic susceptibility, turning it easily separable from the reaction in a heterogeneous medium. Herein, magnetite was synthesized and coated with tetraethy lorthosilicate (TEOS) and then used to support phosphotungstic acid (H3PW12O40, HPW). The X%HPW/ MNP@SiO2 materials were characterized by several techniques, such as EDXRF, XRD, SEM, FT-IR, low tem perature N2 physisorption, and pyridine gas adsorption/desorption (Py-TPD) and then applied to the esterifi cation reaction of oleic acid with ethanol. The results successfully indicated the synthesis of the catalysts, keeping the structural and magnetic characteristics of the MNP@SiO2 and providing a good dispersion and integrity of HPW on its surface. In the model reaction, high activity, selectivity (100%), and stability were observed, with yields of 98%, 66% and 54% of ethyl oleate when using 30%, 20% and 10%HPW/MPN@SiO2, respectively, for a reaction time of one hour and an acid to ethanol molar ratio of 1:6. No leaching of the active phase was detected up to four recycles of the best catalyst (30%HPW/MPN@SiO2).	pt_BR
dc.description.unidade	Instituto de Química (IQ)	pt_BR
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