Neutron scattering studies of porous material

TL;DR

This paper discusses how neutron scattering helps study porous materials for better gas separation, focusing on recent experiments at the POWGEN instrument.

Contribution

The paper presents new neutron scattering data on H2/D2 adsorption, ethylbenzene isomer separation, and He/H2 separation in porous materials.

Findings

Stepwise H2/D2 adsorption isotherms in M(ta)2 systems were observed and structurally analyzed.

NiFA framework materials showed potential for ethylbenzene isomer separation.

KAUST-7 material demonstrated effectiveness in separating He/H2 mixtures.

Abstract

Advances in porous materials—such as metal-organic frameworks (MOFs) and zeolites—offer promising pathways for developing next- generation separation systems, which account for 10–15% of global energy consumption, with improved selectivity, capacity, and throughput under ambient conditions. Realizing these benefits, however, requires experimental systems capable of mimicking realistic, dynamic, multicomponent gas environments.

Neutrons are uniquely suited for this area of research due to their sensitivity to light elements (e.g., hydrogen, carbon, and oxygen), ability to penetrate complex sample environments, and capacity to provide atomic-scale information on adsorption sites, host–guest interactions, and diffusion mechanisms. These insights are critical for unraveling the structure–property relationships that govern separation performance.

Here in, I will report the most recent neutron scattering studies of porous material conducted at the POWGEN instrument. I will discuss 1) the stepwise H2/D2 adsorption isotherm in M(ta)2 (M = Ni and Zn) systems and its structural origin using combined elastic and inelastic neutrons scattering. 2) ethylbenzene isomers separation using a NiFA framework materials and 3) He/H2 separation in the KAUST-7 material.