High-throughput screening of small-molecule adsorption in MOF

TL;DR

This study employs high-throughput computational screening with advanced density functional theory to analyze small-molecule adsorption in MOF-74-M, identifying promising materials for gas storage, separation, and capture applications.

Contribution

It introduces a large-scale screening approach combining high-throughput methods with van der Waals DFT to evaluate adsorption in a wide range of MOFs, revealing key adsorption behaviors.

Findings

Only a few noble metals favor CO2 adsorption.

Water competes with CO2 for adsorption sites.

Molecular blends can be separated by MOFs.

Abstract

Using high-throughput screening coupled with state-of-the-art van der Waals density functional theory, we investigate the adsorption properties of four important molecules, H_2, CO_2, CH_4, and H_2O in MOF-74-M with M = Be, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Zr, Nb, Ru, Rh, Pd, La, W, Os, Ir, and Pt. We show that high-throughput techniques can aid in speeding up the development and refinement of effective materials for hydrogen storage, carbon capture, and gas separation. The exploration of the configurational adsorption space allows us to extract crucial information concerning, for example, the competition of water with CO_2 for the adsorption "pockets." We find that only a few noble metals---Rh, Pd, Os, Ir, and Pt---favor the adsorption of CO_2 and hence are potential candidates for effective carbon-capture materials. Our findings further reveal significant differences in the binding characteristics of H_2, CO_2, CH_4, and H_2O within the MOF structure, indicating that molecular blends can be successfully separated by these nano-porous materials.