Metal-Organic Frameworks Cu_3(BTC)_2 Decorated Hierarchical Porous Carbon Monolith Composites for CO_2 Capture

摘要

Porous carbon materials are considered to be one of the most promising candidates for CO_2 capture due to their low cost, high surface area, high thermal and chemical stability and excellent performance in CO_2 capture. Another high-performance CO_2 adsorption material Cu_3(BTC)_2 is usually obtained as finely dispersed powders. In order to unite the performance features of monolithic porous carbon and Cu_3(BTC)_2, herein, we tend to investigate the synthesis of such composite materials composed of HCM and Cu_3(BTC)_2 for the application of CO_2 capture. Cu_3(BTC)_2@HCM composites were synthesized by a step-by-step impregnation and crystallization method. This is the first report on the utilization of the free pore space of hierarchical porous carbon monolith for the growth of Cu_3(BTC)_2 crystallites. The obtained composites were characterized by different means such as SEM, XRD, FT-IR, TG-DSC, equilibrium CO_2 and N_2 adsorption isotherms at 25 °C, and dynamic breakthrough separation experiments. The composites show high CO_2 adsorption capacity at ambient conditions and can be regenerated at room temperature. When volumetric adsorption capacity is the major concern, such Cu_3(BTC)_2@HCM composite can meet this demand by showing remarkable increment in CO_2 adsorption on a volumetric basis.