CO2 capture enhancement for InOF-1: confinement of 2-propanol

Abstract

The 2-propanol (i-PrOH) adsorption properties of InOF-1 are investigated along with the confinement of small amounts of this alcohol to enhance the CO₂ capture for i-PrOH@InOF-1 (1.25-fold improvement compared to pristine InOF-1). InOF-1 exhibited a high affinity towards i-PrOH, experimentally quantified by ΔH_ads (−55 kJ mol⁻¹), and DFT geometry optimisations showed strong hydrogen bonding between O(i-PrOH) and H(μ₂-OH). Quantum chemical models demonstrated that the CO₂ capture increase for i-PrOH@InOF-1 was due to a decrease in the void surface of InOF-1 (bottleneck effect), and the formation of essential hydrogen bonds of CO₂ with i-PrOH and with the hydroxo functional group (μ₂-OH) of InOF-1.