Hollow structured Cu@ZrO_(2) derived from Zr-MOF for selective hydrogenation of CO_(2) to methanol

The development of a highly efficient catalyst for CO_(2) activation and selective conversion to methanol is critical to address the issues associated with the high thermal stability of CO_(2) and controllable synthesis of methanol.Cu-based catalysts have been widely studied because of the low cost and excellent performance in mild conditions.However,the improvement of catalytic activity and selectivity remains challenging.Herein,we prepared hollow Cu@ZrO_(2) catalysts through pyrolysis of Cu-loaded Zr-MOF for CO_(2) hydrogenation to methanol.Low-temperature pyrolysis generated highly dispersed Cu nanoparticles with balanced Cu^(0)/Cu^(+)sites,larger amounts of surface basic sites and abundant Cu-ZrO_(2) interface in the hollow structure,contributing to enhanced catalytic capacity for adsorption/activation of CO_(2) and selective hydrogenation to methanol.In situ Fourier Transform Infrared Spectroscopy revealed the methanol formation followed the formate-intermediated pathway.This work would provide a guideline for the design of high-performance catalysts and the understanding of the mechanism and active sites for CO_(2) hydrogenation to methanol.

静电纺丝法制备PI/MOF–808混合基质膜及性能

以金属有机骨架材料(MOF–808)为填料,将其加入到均苯四甲酸二酐-4,4’-二氨基二苯醚(PMDA–ODA)型聚酰亚胺(PI)前驱体中,通过静电纺丝法制备出不同MOF–808添加量的PI混合基质膜。采用傅立叶变换红外光谱仪、X射线衍射仪、扫描电子显微镜和拉伸试验机、热重分析仪对MOF–808晶体结构和PI/MOF–808混合基质膜的形貌、力学性能、孔隙率、吸液率及热稳定性进行表征。结果表明,在PI中添加MOF–808,PI/MOF–808混合基质膜有序度和交联程度增大,拉伸强度和热稳定性随晶体添加量的增加而增大,MOF–808质量分数为0.5%的混合基质膜的拉伸强度是纯PI纤维膜的1.5倍;孔隙率和吸液率随着MOF–808添加量的增加而降低,MOF–808质量分数为0.7%的混合基质膜的孔隙率和吸液率是常用聚烯烃隔膜的1.6倍和7.4倍。