Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

Bicudo, Tatiana de Campos; Sales, Rafael V.; Moura, Heloise O. M. A.; Câmara, Anne B. F.; Rodríguez-Castellón, Enrique; Silva, José A. B.; Pergher, Sibele B. C.; Campos, Leila M. A.; Urbina, Maritza M.; Carvalho, Luciene S. de

Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

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dc.contributor.author	Bicudo, Tatiana de Campos
dc.contributor.author	Sales, Rafael V.
dc.contributor.author	Moura, Heloise O. M. A.
dc.contributor.author	Câmara, Anne B. F.
dc.contributor.author	Rodríguez-Castellón, Enrique
dc.contributor.author	Silva, José A. B.
dc.contributor.author	Pergher, Sibele B. C.
dc.contributor.author	Campos, Leila M. A.
dc.contributor.author	Urbina, Maritza M.
dc.contributor.author	Carvalho, Luciene S. de
dc.date.accessioned	2020-10-08T23:32:52Z
dc.date.available	2020-10-08T23:32:52Z
dc.date.issued	2019-07-30
dc.description.resumo	Chemical interactions between metal particles (Ag or Ni) dispersed in a low-cost MCM-41M produced from beach sand amorphous silica and sulfur compounds were evaluated in the deep adsorptive desulfurization process of real diesel fuel. N2 adsorption-desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy coupled to energy-dispersive X-ray spectroscopy (STEM-EDX) were used for characterizing the adsorbents. HRTEM and XPS confirmed the high dispersion of Ag nanoparticles on the MCM-41 surface, and its chemical interaction with support and sulfur compounds by diverse mechanisms such as π-complexation and oxidation. Thermodynamic tests indicated that the adsorption of sulfur compounds over Ag(I)/MCM-41M is an endothermic process under the studied conditions. The magnitude of DH◦ (42.1 kJ/mol) indicates that chemisorptive mechanisms govern the sulfur removal. The best fit of kinetic and equilibrium data to pseudo-second order (R2 > 0.99) and Langmuir models (R2 > 0.98), respectively, along with the results for intraparticle diffusion and Boyd’s film-diffusion kinetic models, suggest that the chemisorptive interaction between organosulfur compounds and Ag nanosites controls sulfur adsorption, as seen in the XPS results. Its adsorption capacity (qm = 31.25 mgS/g) was 10 times higher than that obtained for pure MCM-41M and double the qm for the Ag(I)/MCM-41C adsorbent from commercial silica. Saturated adsorbents presented a satisfactory regeneration rate after a total of five sulfur adsorption cycles	pt_BR
dc.identifier.citation	SALES, Rafael V.; MOURA, Heloise O. M. A.; CÂMARA, Anne B. F.; RODRÍGUEZ-CASTELLÓN, Enrique; SILVA, José A. B.; PERGHER, Sibele B. C.; CAMPOS, Leila M. A.; URBINA, Maritza M.; BICUDO, Tatiana C.; CARVALHO, Luciene S. de. Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel. Catalysts, [S.L.], v. 9, n. 8, p. 651-651, 30 jul. 2019. Disponível em: https://www.mdpi.com/2073-4344/9/8/651. Acesso em: 08 set. 2020. http://dx.doi.org/10.3390/catal9080651.	pt_BR
dc.identifier.doi	10.3390/catal9080651
dc.identifier.issn	2073-4344
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30341
dc.language	en	pt_BR
dc.publisher	MDPI AG	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Desulfurization	pt_BR
dc.subject	Chemisorption	pt_BR
dc.subject	MPI silica	pt_BR
dc.subject	MCM-41	pt_BR
dc.subject	Ag nanoparticles	pt_BR
dc.subject	XPS assessment	pt_BR
dc.title	Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel	pt_BR
dc.type	article	pt_BR