Synthesis and Characterization of Mesoporous Materials MCM-41 Incorporated by Yttrium, Neodymium and Samarium
来源期刊：JOURNAL OF RARE EARTHS2005年第5期
论文作者：Wei Jianxin Huang Shaoyun Shi Lei Ma Guangwei Ge Xuegui
Key words：MCM-41 mesoporous materials; incorporate; template; synthesis; characterization; rare earths;
Abstract: Using cetyl-trimethyl-ammonium bromide (CTMAB) as template agent and tetraethylorthosilicate (TEOS) as silica source, the MCM-41 mesoporous materials were synthesized with Y, Nd and Sm incorporated in the framework under hydrothermal conditions. The structure and the micro-morphology of the materials and the state of Y, Nd and Sm were investigated through the analyses of XRD, nitrogen adsorption-desorption isotherm, SEM, IR and TG-DTA. The XRD results indicate that the synthetic samples are of typical structure of mesoporous MCM-41 with ordered hexagonal arrangements, and Y, Nd and Sm can be incorporated into the framework of these mesoporous materials. Nitrogen adsorption-desorption isotherms show that the samples possess the typical mesopores character. SEM micrographs reveal that the incorporated samples show a well-defined spherical morphology with the diameter ranging 0.10～0.15 μm. The occurrence of two different template sorption sites in the framework as revealed by TG-DTA analysis further suggests the presence of Y, Nd and Sm in siliceous framework.
Wei Jianxin1，Huang Shaoyun2，Shi Lei1，Ma Guangwei3，Ge Xuegui1
(1.College of Material and Chemistry, China University of Geoscience, Wuhan 430074, China;
2.Wuhan Institute of Chemical Technology, Wuhan 430074, China;
3.Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China)
Abstract:Using cetyl-trimethyl-ammonium bromide (CTMAB) as template agent and tetraethylorthosilicate (TEOS) as silica source, the MCM-41 mesoporous materials were synthesized with Y, Nd and Sm incorporated in the framework under hydrothermal conditions. The structure and the micro-morphology of the materials and the state of Y, Nd and Sm were investigated through the analyses of XRD, nitrogen adsorption-desorption isotherm, SEM, IR and TG-DTA. The XRD results indicate that the synthetic samples are of typical structure of mesoporous MCM-41 with ordered hexagonal arrangements, and Y, Nd and Sm can be incorporated into the framework of these mesoporous materials. Nitrogen adsorption-desorption isotherms show that the samples possess the typical mesopores character. SEM micrographs reveal that the incorporated samples show a well-defined spherical morphology with the diameter ranging 0.10～0.15 μm. The occurrence of two different template sorption sites in the framework as revealed by TG-DTA analysis further suggests the presence of Y, Nd and Sm in siliceous framework.
Key words:MCM-41 mesoporous materials; incorporate; template; synthesis; characterization; rare earths;
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