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首页> 外文期刊>Catalysis science & technology >A novel strategy for constructing mesoporous solid superbase catalysts: bimetallic Al-La oxides supported on SBA-15 modified with KF
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A novel strategy for constructing mesoporous solid superbase catalysts: bimetallic Al-La oxides supported on SBA-15 modified with KF

机译：小说的策略构建介孔固体superbase催化剂:双金属Al-La氧化物支持与KF SBA-15修改

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Bimetallic Al-La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. This breaks the tradition of decomposition of KNO3 at high temperature and gives rise to a new approach to generating superbasic sites on SBA-15. The physico-chemical characteristics of the prepared KF/Al-La@SBA-15 materials were investigated using FT-IR, XRD, TG-DTG, N-2 adsorption-desorption, TEM, SEM-EDS, acid-base titration, Hammett indicators and CO2-TPD measurements. The results demonstrated that the addition of Al species promoted the dispersion behavior of La species inside the channels, and the bimetallic species could synergistically protect the mesoporous structures of SBA-15 against KF corrosion. With increasing Al content, KF/Al-La@SBA-15 exhibited a long-range ordering of the pores with relatively narrow pore size distribution as well as high specific surface area. The research results showed that the KF/Al-La@SBA-15 (0.4) catalyst possessed a total basicity up to 0.79 mmol g(-1) and superbasicity with a strength of 26.5. The catalytic activity of the prepared materials was evaluated in the ring-opening reaction of propylene oxide with methanol. Compared with the SBA-15 supported monometallic oxide (Al or La) catalysts, KF/Al-La@SBA-15 (0.4) exhibited the highest catalytic activity for the ring-opening reaction of propylene oxide with methanol. This is associated with the synergistic effects between Al and La species and the high dispersion of active components on the SBA-15 support.
机译：双金属Al-La氧化物是结合地预镀在SBA-15之前介绍的钾氟化实现固体superbases低由改性渗湿温度方法。在高温度和分解生产硝酸钾产生了一种新方法生成SBA-15 superbasic网站。准备KF / Al-La@SBA-15的特性材料研究使用傅立叶变换红外光谱,x射线衍射,TG-DTG, 2 n adsorption-desorption TEM、能谱酸碱滴定,哈米特指标和CO2-TPD测量。艾尔物种的增加促进了洛杉矶的色散行为物种内渠道,双金属物种协同保护介孔结构对KF SBA-15腐蚀。铝含量、KF / Al-La@SBA-15展出远程命令的毛孔相对孔隙大小分布窄以及高比表面积。表明,KF / Al-La@SBA-15(0.4)催化剂拥有总碱度0.79更易与g (1)和superbasicity强度为26.5。准备材料的催化活性评估的开环反应氧化丙烯与甲醇。SBA-15支持使用单金属的氧化物(Al或拉)催化剂,KF / Al-La@SBA-15(0.4)展出开环催化活性最高氧化丙烯与甲醇反应。与协同效应艾尔和洛杉矶之间的物种和高色散SBA-15活跃组件的支持。

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