High and selective CO2 uptake, H2 storage and methanol sensing on the amine-decorated 12-connected MOF CAU-1

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).

Highly porous activated carbon materials from carbonized biomass with high CO2 capturing capacity

“…GSK1-700 shows a higher CO 2 uptake (7.49 mmol g -1 ) than the previously reported while the highest capacities reported so far are 7.4 and 7.2 mmol g -1 for AG-2-700 [20] and MOF CAU-1 [43] respectively (see Table S1 † and Figure S6 †).…”

Enhanced selectivity of CO2 over CH4 in sulphonate-, carboxylate- and iodo-functionalized UiO-66 frameworks

“…From the initial slope of the single-component CO 2 and CH 4 adsorption isotherms, ideal CO 2 /CH 4 selectivities (as ratios of the initial slopes) were determined. [68][69][70] The ideal CO 2 /CH 4 adsorption selectivities (Table 4) of all the three compounds (4.5-5.2) were found to be higher compared to that of the parent UiO-66 compound (2.6). This selectivity trend is also in agreement with the previously predicted sequence of CO 2 /CH 4 selectivity of the compounds.…”

An In Situ One‐Pot Synthetic Approach towards Multivariate Zirconium MOFs

“…[18] Moreover, amino groups can undergo aw ide variety of chemical transformations,w hich is useful for further adjusting chemical functionality of the MOF. [19] NiTCPP&UiO-66-NH 2 was synthesized and characterized (Supporting Information).…”