氨基修饰的多孔缠绕MOF的合成及其催化CO_(2)性能研究

Synthesis of Amino-modified Porous Entangled MOF and Its Catalytic CO_(2) Performance

采用水热方法,以2-氨基-联苯-4,4′-二羧酸作为有机连接体合成出[Zn(2-NH_(2)-bpca)(bimb)]·x solvents的氨基修饰MOFs材料。通过X-射线单晶衍射、X-射线粉末衍射、红外光谱、热重和气体吸附等对合成的MOFs进行结构及性能的研究。结果显示,该化合物属于[3+2]穿插模式的金刚石缠绕结构,孔道内被未配位的氨基指向。该化合物具有优异的稳定性,对CO_(2)有较强的吸附能力,可以作为催化CO_(2)的催化剂。在101.325 kPa、80℃的条件下反应12 h,以四丁基溴化铵(Tetrabutylammonium bromide,TBAB)为辅助催化剂,以1,2-环氧己烷为底物催化CO_(2),用气相色谱测定反应物的转化率为92.6%,进行了五轮循环实验后,转化率依旧为84.5%。

The amino-modified MOFs materials of[Zn(2-NH_(2)-bpca)(bimb)]-x solvents were synthesized by hydrothermal method and using 2-amino-biphenyl-4,4′-dicarboxylic acid as organic linker.The structure and properties of the synthesized MOFs were investigated by X-ray single crystal diffractometer,X-ray powder diffraction,infrared spectroscopy,thermogravimetry and gas adsorption.The results show that the compound belongs to a diamond-wound structure in the[3+2]intercalation mode,with the pore channels pointed by uncoordinated amino groups.The compound has excellent stability and strong adsorption capacity for CO_(2),and can be used as a catalyst for catalytic CO_(2).The conversion of CO_(2) catalyzed by tetrabutylammonium bromide as co-catalyst and 1,2-epoxyhexane as substrate was 92.6%at 101.325 kPa,80℃,and 12 h.The conversion remained 84.5%after five rounds of cycling experiments.