4 documents found, page 1 of 1
CO2 capture with mesoporous silicas modified with amines by double functionaliz...
Duarte, Lairana Lima; Sánchez-Zambrano, Kléver Santiago; Maia, Débora Aline Soares; Vilarrasa-García, Enrique; Bastos Neto, MoisésCO₂ adsorption on mesoporous silica modified with amine by double functionalization was studied. Adsorption microcalorimetry was used in order to investigate the influence of increasing the nitrogen surface density on double functionalized materials with respect to the only grafted materials. The distribution of sites and the rate-controlling mechanism of adsorption were evaluated. A Tian Calvet microcalorimete...
Insights into optimized synthesis conditions of hollow microspheres of silica f...
Santos, Bianca Ferreira dos; Cecilia, Juan Antonio; Bastos Neto, Moisés; Rodríguez-Castellón, Enrique; Azevedo, Diana Cristina Silva deHollow microspheres of silica were synthesized with different ethanol/water ratios (0.4, 1.0, 2.0 and 6.0) to assess the influence of this parameter on the morphology/porosity of the samples and thus on their water adsorption capacity. The samples were characterized by N2 at 77 K and CO2 at 273 K adsorption isotherms, scanning electron microscopy, transmission electron microscopy and water vapor isotherms at 29...
Zeólita 4A para purificação do gás de aterro sanitário
Souza Filho, José Demontier Vieira de; Lima, Ari Clecius Alves de; Stefanutti, Ronaldo; Silva, Wildson Max Barbosa da; Bastos Neto, MoisésThe anaerobic decomposition in landfills produces a gas mixture known as landfill biogas. This biogas consists mainly of CH4 and CO2. The CO2 removal can be carried out by means of adsorption. In order to promote CO2 removal, zeolite type 4A was used as solid adsorbent. The synthesized zeolite was characterized by scanning electron microscopy and X-ray diffraction. CH4/CO2 mixture isotherms were obtained in a m...
Avaliação da seletividade de carbonos ativados comerciais a partir das suas pro...
Santos, Bianca Ferreira dos; Moura, Karine Oliveira; Siqueira, Rafael Magalhães; Vilarrasa-García, Enrique; Bastos Neto, MoisésA seletividade de três carbonos ativados comerciais (CA1, CA2 e CA3) foi determinada a partir do modelo de Sips e avaliada em função das propriedades texturais. Estas foram obtidas a partir de isotermas de N2 e CO2 a 77 K e 273 K, respectivamente, que confirmaram que estes carbonos são materiais altamente microporosos. Isotermas de adsorção de N2, CO2 e da mistura CO2/N2 a 298 K foram adquiridas por método grav...