Synthesis Of Mesoporous Material SBA-15 And Its Application In Adsorption Desulfurization

Much attention has been paid to the novel M41S silica mesoporous materials since the first report on the synthesis of these materials (particularly MCM-41) by Mobil company in 1992. They possess extremely regular arrangement of pore structures, narrow pore size distribution, great surface areas, huge pore volume, remarkable mechanical and chemical stability. Owing to these excellent characteristics, mesoporous silica materials and functionalized mesoporous materials have been widely used in many fields. SBA-15 and MCM-41 are endowed with 1D-hexagonal mesoporous structure. SBA-15 have particularly attractive properties such as larger pore diameter, thicker silica wall and higher hydrothermal stabilities than those of MCM-41. The applications of SBA-15 and its derivation have attracted considerable attention in many fields, such as catalysis, adsorption, separation and so on. As a novel organic-inorganic hybrid materials, mesoporous materials have therefore wide application prospect in many fields.In this paper, we successfully synthesized functionalized mesoporous materials SBA-15. These samples were employed as adsorption desulfurization for a model gasoline.The better result was obtained.The thesis consists of three parts:Chapter 1 reviews the current state of the art in silica-based mesoporous materials research, introduces their synthesizing methods including their derivation, synthesizing mechanism, the influence factors of preparation, characterization and application in many fields especially in the fields of adsorption and separation.In Chapter 2, the functionalized mesoporous materials SBA-15 with thiol and sulfonic acid groups were synthesized by means of one-step synthesis approach involving co-condensation of tetraethoxysilane and mercaptopropyltrimethoxysilane in the presence of block copolymers P123 under specificly acidic condition. The materials were further characterized by powder X-ray diffraction, elemental analysis, acid-base titration, FT-IR, TG-DTA, N₂ adsorption-desorption. The experimental data demonstrate that we successfully synthesized functionalized mesoporous materials SBA-15, which exhibit well mesostructure, great acid capacity, high thermal stability, large surface areas, huge pore volume, thick pore wall, narrow pore size distribution.In Chapter 3, functionalized SBA-15 via ion exchange with metal ions were used to remove dibenzothiophene from a model gasoline such as octane. The results demonstrate that the material obtained via SBA-15-SO₃H ion exchange with Ag⁺ have the highest adsorption capacity to model system. Well-ordered SBA-15-SO₃Ag was prepared under the most optimize experimental conditions. The adsorption efficiency reached 77.01% for dibenzothiophene.The material is a good kind of adsorption desulfurization material for fuel.