No abstract

The amine-decorated microporous metal-organic framework CAU-1 was readily synthesized and activated using a home-made efficient protocol. It exhibited a high heat of adsorption for CO 2 , high CO 2 uptake capacity, and an impressive selectivity for CO 2 over N 2 . At 273 K and up to 1 atm, CO 2 uptake capacity can reach as much as 7.2 mmol g À1 . Comparatively, the CH 4 and N 2 uptakes at 273 K and 1 atm were only 1.34 mmol g À1 and 0.37 mmol g À1 , respectively. The CO 2 /N 2 selectivity was 101 : 1 at 273 K. The isosteric heat of adsorption (Q st ) for CO 2 was $48 kJ mol À1 at the onset of adsorption, and it decreases to $28 kJ mol À1 at higher CO 2 pressures. Furthermore, CAU-1 can adsorb 2.0 wt% and 4.0 wt% hydrogen at 77 K under 1 atm and 30 atm, respectively. The adsorption characteristics of CAU-1 for methanol investigated in situ with a quartz crystal microbalance (QCM), indicated that this particular MOF structure can be used as a highly sensitive sensor for methanol detection such as direct methanol fuel cells. Recently, the basic properties of amine functionalized MOF were tested in Knoevenagel condensation reactions, 14,15 and Couck et al. 16 found that at low surface coverage, the CO 2 /CH 4 selectivity of the amine functionalized MIL-53(Al) was larger than that of the parent MIL-53(Al).

Various MOFs with tailored nanoporosities have recently been developed as potential storage media for CO 2 and H 2 . The composites based on Cu-BTC and graphene layers were prepared with different percentages of graphene oxide (GO). Through the characterization analyses and gas adsorption experiments, we found that the nanosized and well-dispersed Cu-BTC induced by the incorporation of GO greatly improved the carbon dioxide capture and hydrogen storage performance of the composites. The materials obtained exhibited about a 30% increase in CO 2 and H 2 storage capacity (from 6.39 mmol g À1 of Cu-BTC to 8.26 mmol g À1 of CG-9 at 273 K and 1 atm for CO 2 ; from 2.81 wt% of Cu-BTC to 3.58 wt% of CG-9 at 77 K and 42 atm for H 2 ). Finally, the CO 2 /CH 4 and CO 2 /N 2 selectivities were calculated according to single-component gas sorption experiment data.