Effective Interactions of Ag Nanoparticleson the Surface of SBA-15 in Performing Deep Desulfurization of Real Diesel Fuel
| Autor: | Anne Beatriz Figueira Câmara, Maritza Montoya Urbina, Luciene Santos de Carvalho, Enrique Rodríguez-Castellón, Sibele B. C. Pergher, Heloise Oliveira Medeiros de Araújo Moura, Clenildo de Longe, Leila Maria Aguilera Campos, Rafael Viana Sales |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences Catalysis lcsh:Chemistry symbols.namesake Adsorption X-ray photoelectron spectroscopy Scanning transmission electron microscopy Monolayer lcsh:TP1-1185 Physical and Theoretical Chemistry Ag nanoparticles Langmuir adsorption model 021001 nanoscience & nanotechnology 0104 chemical sciences Flue-gas desulfurization SBA-15 Chemical engineering XPS assessment lcsh:QD1-999 Chemisorption symbols chemisorptive desulfurization 0210 nano-technology π-complexation |
| Zdroj: | Catalysts, Vol 10, Iss 593, p 593 (2020) Catalysts Volume 10 Issue 5 |
| ISSN: | 2073-4344 |
| Popis: | SBA-15 materials as-synthesized and impregnated with Ag nanoparticles were applied to perform adsorptive desulfurization of real diesel fuel. High-angle annular dark-field scanning transmission electron microscopy and field-emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (HAADF-STEM-EDX and FESEM-EDX) and X-ray photoelectron spectroscopy (XPS) results confirmed that there is uniform distribution of Ag nanodomains on the surface and in the channels of a 2AgSBA-15 (2% Ag) sample. The interaction between sulfur compounds and adsorbent mainly occurred via &pi complexation mechanisms, as observed via XPS and equilibrium data. The kinetic results for 2AgSBA-15 were better fitted to the pseudo-second-order model (R2 > 0.9999), indicating that the determining step of the adsorptive process is chemisorption, whereas the equilibrium results were better fitted to the Langmuir model (R2 > 0.9994), thus indicating that the adsorption occurs on the adsorbent surface monolayer with significant adsorption capacity (qm = 20.30 mgS/g), approximately two times greater than that observed for pure SBA-15. The mean desulfurization reached by the adsorbents was up to 86.8% for six recycling steps. |
| Databáze: | OpenAIRE |
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