Preparation of Ni(HCO_3)_2 and its catalytic performance in synthesis of benzoin ethyl ether  

Ni(HCO_3)_2的制备及其在安息香乙醚合成中的催化应用(英文)

作　　者：吴旭[1] 安霞[1] 谢鲜梅[1] 

机构地区：[1]太原理工大学化学与化工学院,太原030024

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1440-1445,共6页中国有色金属学报（英文版）

基　　金：Project(50872086)supported by the National Natural Science Foundation of China;Project(2012021006-3)supported by the Natural Science Foundation of Shanxi Province,China;Project(2012L022)supported by Special/Youth Foundation of Taiyuan University of Technology,China;Project(20120321033-02)supported by Science and Technology Research of Shanxi Province,China

摘　　要：Ni（HCO3）2 with unique phase and high crystallinity was synthesized with urea hydrolysis. The as-prepared samples were well characterized in detail. N2 adsorption and desorption result manifests a high surface area of 99.03 m2/g with a pore size of 7.8 nm. Scanning electron microscopy （SEM） and particle size distribution reveal that the diameters of the formed pellets are uniform. Thermogravimetry （TG） analysis result shows that 500 ℃ could be the appropriate temperature for converting Ni（HCO3）2 precursors into NiO via a thermal decomposition process. CO2 and NH3 temperature-programmed desorption results show that Ni（HCO3）2 has explicit acid-base sites. Transmission electron microscopy （TEM） results vividly indicate that the pellets are aggregated by hexagonal platelets and possess porous structures. Ni（HCO3）2 can efficiently catalyze the one-step synthesis of benzoin ethyl ether from benzaldehyde and ethanol, with the conversion ofbenzaldehyde up to 57.5% and nearly 100% selectivity of benzoin ethyl ether.应用尿素热解法合成晶相单一、结晶度较好的Ni(HCO3)2多孔材料,借助多种表征手段对其物化性能进行表征。N2吸附-脱附结果表明Ni(HCO3)2多孔材料有99.03 m3/g的比表面积、7.8 nm左右的孔径;扫描电镜(SEM)和粒度分布结果说明Ni(HCO3)2微球的粒径均匀;热重分析结果表明500°C是热解Ni(HCO3)2制备NiO的适宜温度;CO2-TPD和NH3-TPD结果表明Ni(HCO3)2具有明显的酸碱双功能活性中心;透射电镜(TEM)结果表明Ni(HCO3)2颗粒是由六边形纳米片聚集而成的,且颗粒具有孔隙结构。将Ni(HCO3)2催化剂应用于苯甲醛与乙醇一步法合成安息香乙醚反应中,Ni(HCO3)2显示出优异的催化活性,反应平衡转化率高达57.5%,安息香乙醚的选择性近100%。

关 键 词：Ni（HCO3）2 CATALYSIS green synthesis benzoin ethyl ether 

分 类 号：TQ138.13[化学工程—无机化工]