Santos, Luciene da SilvaSales, Rafael Viana2017-04-052017-04-052015-12-21SALES, Rafael Viana. Avaliação da dessulfurização de diesel utilizando adsorventes mesoporosos modificados pós-situ com íons metálicos. 2015. 115f. Dissertação (Mestrado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2015.https://repositorio.ufrn.br/jspui/handle/123456789/22560The emission of sulfur compounds from the burning of oil products, such as diesel and gasoline, is responsible for causing environmental damage to human health and increase industrial costs. In this work, adsorptive processes of sulfur compounds from the diesel provided by the refinery Potiguar Clara Camarão, RPCC, with high sulfur content, were studied using MCM-41 type of mesoporous silica which were obtained by hydrothermal method, from two amorphous silicas, MP1 silica, a new material evaluated in this work and a commercial silica, used for comparison. For MCM-41 mesoporous adsorbents, synthesized, it was evaluated the capability of sulfur adsorption in fixed bed columns, and later they were modified post-situ with metal cations by wet impregnation and physical dispersion. Different chemical compositions of metal compounds were tested with the use of oxides and salts, to obtain active sites and evaluation of complexing, between the sulfur of organic compounds and the metal cations inserted on the adsorbent, favoring adsorption. The synthesized adsorbents, pure and modified, were characterized by the techniques of X-ray diffraction - XRD, Fourier transform infrared spectroscopy - FTIR, thermogravimetric analysis - TG / DTG, textural analysis by the method of BET / BJH and scanning electron microscopy - SEM with energy dispersive spectroscopy (EDS). A 23 factorial plan was applied to study the adsorption process which metal cations blends were tested in the adsorption of existing sulfur compounds. The sulfur content monitoring in diesel fuel during the adsorption process occurred by ultraviolet fluorescence Spectrometry (UVF). The adsorption kinetics and equilibrium were evaluated, where equilibrium isotherms were obtained for the evaluation of the maximum adsorption capacity of sulfur compounds in adsorbent systems developed in this work. Maximum adsorption capacities were obtained ,at mg.g-1, 16,64 and 14,98, respectively, for the tested adsorbent: 2AgS/MCM-41(M) e 1NiS1AgS/MCM-41(M. The experimental data were fit to a Langmuir balance models and Freundlich. The removal of sulfur present in the diesel was significant, ranging from 54.3% to 88.9% compared to the initial concentration of contaminant. By statistical analysis it was found that blends prepared from the adsorbent modified by salts showed a higher adsorption capacity than the ones prepared by impregnation of metal oxides, which may contribute to the reduction of industrial costs, since the wet impregnation method dispenses a second calcination.Acesso AbertoDessulfurizaçãoMCM-41Sílica MP1AdsorçãoComplexaçãomasterThesisCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA