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论文类型：期刊论文

发表时间：2012-11-01

发表刊物：ACS APPLIED MATERIALS & INTERFACES

收录刊物：SCIE、EI、PubMed、Scopus

卷号：4

期号：11

页面范围：6125-6132

ISSN号：1944-8244

关键字：hierarchical porous carbon monolith; MOFs; composites; CO2 capture; volumetric based CO2 capture capability; dynamic gas separation

摘要：This work aims to optimize the structural features of hierarchical porous carbon monolith (HCM) by incorporating the advantages of metal-organic frameworks (MOFs) (Cu-3(BTC)(2)) to maximize the volumetric based CO2 capture capability (CO2 capacity in cm(3) per cm(3) adsorbent), which is seriously required for the practical application of CO2 capture. The monolithic HCM was used as a matrix, in which Cu-3(BTC)(2) was in situ synthesized, to form HCM-Cu-3(BTC)(2) composites by a step-by-step impregnation and crystallization method. The resulted HCM-Cu-3(BTC)(2) composites, which retain the monolithic shape and exhibit unique hybrid structure features of both HCM and Cu-3(BTC)(2), show high CO2 uptake of 22.7 cm(3) cm(-3) on a volumetric basis. This value is nearly as twice as the uptake of original HCM. The dynamic gas separation measurement of HCM-Cu-3(BTC)(2), using 16% (v/v) CO2 in N-2 as feedstock, illustrates that CO2 can be easily separated from N-2 under the ambient conditions and achieves a high separation factor for CO2 over N-2) ranging from 67 to 100, reflecting a strongly competitive CO2 adsorption by the composite. A facile CO2 release can be realized by purging an argon flow through the fixed-bed adsorber at 25 degrees C, indicating the good regeneration ability.