双金属氰化物催化剂的制备、表征及其催化性能  

Preparation,Characterization and Catalytic Performance of Double Metal Cyanide Complex

作　　者：闫晶晶 张堃宇 黄振 韩正 夏正奕 YAN Jing-jing;ZHANG Kun-yu;HUANG Zhen;HAN Zheng;XIA Zheng-yi(Jiangsu Sobute New Materials Co.,Ltd.,Jiangsu Nanjing 211103,China)

机构地区：[1]江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《广州化工》2024年第17期19-22,36,共5页GuangZhou Chemical Industry

基　　金：国家自然科学基金青年基金(52102022);江宁区关键核心技术攻关“揭榜挂帅”项目(2023JBGS009)。

摘　　要：以丙烯酸-异戊烯醇聚氧乙烯醚梳型共聚物为分散剂,通过分散聚合制备了高活性的双金属氰化物催化剂。元素分析和红外光谱证实了分散剂不仅起分散稳定作用,也参与了催化剂化学结构的形成。X射线衍射谱图和热失重分析说明分散剂与中心金属离子发生了直接络合作用,晶型发生畸变,趋向于无定形态。扫描电镜进一步表明分散法制备的催化剂整体尺寸明显小于直接沉淀法,形貌由紧密的片层状结构转变成更松散的无序堆积。得益于催化剂比表面积增加和单位面积上活性位点的增多,分散法制备的双金属氰化物的催化活性高达66585 g/g催化剂,远高于直接沉淀法(8245 g/g催化剂)。循环实验显示分散法制备的催化剂具有较好的循环能力,在第五次循环时催化活性仍能达56997 g/g催化剂(85.6%),远高于直接沉淀法的1501 g/g催化剂(18.2%)。A highly active double metal cyanide catalyst was prepared by dispersion polymerization,using acrylic acid-isoprenol polyoxyethylene ether comb copolymer as dispersant.Elemental analysis and FT-IR confirmed that the dispersant not only played a role in dispersion stability,but also participated in the formation of the chemical structure of the catalyst.XRD and TGA showed that the dispersant had a direct complexation with the central metal ions,and the crystal form was distorted,tending to be more amorphous.It was further shown by SEM that the overall size of the catalyst prepared by dispersion method was obviously smaller than that by direct precipitation method,and its morphology changed from compact lamellar structure to more loose disordered stacking.Owing to the increase of specific surface area and active sites per unit area,the catalytic activity of complex prepared by dispersion method was as high as 66585 g/g catalyst,which was much higher than that of direct precipitation method(8245 g/g catalyst).The circulation experiment showed that the catalyst prepared by dispersion method had good circulation ability,and the catalytic activity was still up to 56997 g/g catalyst(85.6%)in the fifth circulation,which was much higher than 1501 g/g catalyst(18.2%)prepared by direct precipitation method.

关 键 词：双金属氰化物催化剂 环氧丙烷 配位催化 开环聚合 

分 类 号：O643.36[理学—物理化学]