Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel
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-ra...
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ri-123456789-303412020-10-11T07:38:28Z 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 Desulfurization Chemisorption MPI silica MCM-41 Ag nanoparticles XPS assessment 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 2020-10-08T23:32:52Z 2020-10-08T23:32:52Z 2019-07-30 article 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. 2073-4344 https://repositorio.ufrn.br/handle/123456789/30341 10.3390/catal9080651 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf MDPI AG |
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RI - UFRN |
| language |
English |
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Desulfurization Chemisorption MPI silica MCM-41 Ag nanoparticles XPS assessment |
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Desulfurization Chemisorption MPI silica MCM-41 Ag nanoparticles XPS assessment 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 |
| description |
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 |
| format |
article |
| author |
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 |
| author_facet |
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 |
| author_sort |
Bicudo, Tatiana de Campos |
| title |
Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel |
| title_short |
Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel |
| title_full |
Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel |
| title_fullStr |
Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel |
| title_full_unstemmed |
Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel |
| title_sort |
assessment of ag nanoparticles interaction over low-cost mesoporous silica in deep desulfurization of diesel |
| publisher |
MDPI AG |
| publishDate |
2020 |
| url |
https://repositorio.ufrn.br/handle/123456789/30341 |
| work_keys_str_mv |
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