Synthesis of La-hexaaluminate catalyst for methane combustion by a reverse SDS microemulsion
来源期刊：Rare Metals2011年第4期
论文作者：YU Yinga,WANG Liangshia,CUI Meishenga,SHI Yongxib,LUO Ruixianb,and CHEN Aifanb a National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,and Grirem Advanced Materials Co.Ltd.,Beijing ,China b Science College,Beijing University of Chemical Technology,Beijing ,China
文章页码：337 - 342
摘 要：La-hexaaluminate catalyst for methane catalytic combustion was synthesized by a reverse microemulsion.Pseudo-ternary phase diagrams of a quaternary microemulsion system of sodium dodecyl sulfate（SDS）,n-pentanol,n-octane,and water（or Al（NO3）3 solution） were presented.The effects of alcohol chain length,cosurfactant-to-surfactant ratio,and salt concentration on the formation and stability of the microemulsion system were studied.The phenomenon that the conductivity changed with water supported the phase behavior of the microemulsion system.La（Mnx/Fex）Al12-xO19-δ catalysts,applied in methane combustion and with high-temperature stability,were synthesized within the stable areas of the phase diagram of the microemulsion system,when SDS was chosen as surfactant,n-pentanol as cosurfactant,and n-octane as oil phase.The physical properties and structure of the catalysts were characterized by BET method,transmission electron microscope（TEM）,and X-ray diffraction（XRD）.A micro-fixed-bed reactor was used to measure the catalytic activity of hexaaluminates in methane combustion.The results show that the reverse microemulsions can be used to produce discrete La-hexaaluminate nanoparticles that display excellent methane combustion activity owing to their high surface area and high thermal stability.
YU Yinga,WANG Liangshia,CUI Meishenga,SHI Yongxib,LUO Ruixianb,and CHEN Aifanb a National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,and Grirem Advanced Materials Co.Ltd.,Beijing 100088,China b Science College,Beijing University of Chemical Technology,Beijing 100029,China
摘 要：La-hexaaluminate catalyst for methane catalytic combustion was synthesized by a reverse microemulsion.Pseudo-ternary phase diagrams of a quaternary microemulsion system of sodium dodecyl sulfate（SDS）,n-pentanol,n-octane,and water（or Al（NO3）3 solution） were presented.The effects of alcohol chain length,cosurfactant-to-surfactant ratio,and salt concentration on the formation and stability of the microemulsion system were studied.The phenomenon that the conductivity changed with water supported the phase behavior of the microemulsion system.La（Mnx/Fex）Al12-xO19-δ catalysts,applied in methane combustion and with high-temperature stability,were synthesized within the stable areas of the phase diagram of the microemulsion system,when SDS was chosen as surfactant,n-pentanol as cosurfactant,and n-octane as oil phase.The physical properties and structure of the catalysts were characterized by BET method,transmission electron microscope（TEM）,and X-ray diffraction（XRD）.A micro-fixed-bed reactor was used to measure the catalytic activity of hexaaluminates in methane combustion.The results show that the reverse microemulsions can be used to produce discrete La-hexaaluminate nanoparticles that display excellent methane combustion activity owing to their high surface area and high thermal stability.
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