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Metal Ions Modified Mesoporous Materials For The Adsorption Removal Of Dimethyl Sulfide At Ambient Temperature

Posted on:2013-04-29Degree:MasterType:Thesis
Country:ChinaCandidate:X D ZhangFull Text:PDF
GTID:2231330392452617Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
Dimethyl sulfide (DMS) is considered to be the most difficult organic sulfide toremove at ambient conditions in the fuel cell industry. Anionic surfactant templatedmesoporous silica (AMS) materials have high surface areas, ordered pore sizedistributions and adjustable pore sizes. Because there are many amino groupsdispersed orderly on the surface, the AMS materials are well known for their use inbase catalyzed reactions, waste water treatment, the immobilization of enzymes andother proteins and the adsorption of heavy metal ions. AMS-2materials areconsidered to be perfect candidates for carriers to load metal ions.The AMS-2materials were synthesized using four different surfactantsN-lauroyl-L-glutamic acid (C12GluA), N-myristoyl-L-glutamic acid (C14GluA),N-palmitoryl-L-glutamic acid (C16GluA) and N-stearoyl-L-glutamic acid (C18GluA),as the templates,3-aminopropyltrimethylthoxysilane (APS) as the co-structure-directing agent (CSDA). Amino functionalized mesoporous silica (denoted asNH2-AMS) can be obtained by the direct synthesis.A series of M-AMS-2materials were prepared by impregnating the metal ionsinto the amino functionalized AMS-2materials to form “NH2-Metal” coordinationbonds. For the amino groups dispering equally on the surface of the materials, themetal ions are ditrubuted orderly. The samples were then calcinated at hightemperature under following air to remove the organic materials. This produced baremetal ions on the silica surface and the bare metal ions would be as active sites to actwith DMS. The samples were then characterized by X-ray diffraction, nitrogenadsorption-desorption, high-resolution transmission electron microscope, thermalgravimetric analysis and inductively coupled plasma atomic emission spectroscope.The performance of these M-AMS-2materials as DMS adsorbents were testedusing a dynamic breakthrough test. The concentration of the mixture gas DMS/N2was kept in15ppm, and defined0.2ppm as the penetration curve. The DMSadsorption capacities of the Cu-AMS-2materials which synthesized by differentsurfactants could reach to9.5252,9.0207,8.1223and7.1126mgS/g of the sorbentseparately. The DMS adsorption capacity of the Ag-AMS-2material could reach to 14.2508mgS/g of the sorbent. These M-AMS-2materials provide a potential way toadsorb sulfur compounds in fuel.
Keywords/Search Tags:Dimethyl sulfide, Mesoporous material, Silica, Adsorption, Metalion
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