  In a world where capture and separation processes represent above 10% of
global energy consumption, novel porous materials, such as Metal-Organic
Frameworks (MOFs) used in adsorption-based processes are a promising
alternative to dethrone the high-energy-demanding distillation. Shape and size
tailor-made pores in combination with Lewis acidic sites can enhance the
adsorbate-adsorbent interactions. Understanding the underlying mechanisms of
adsorption is essential to designing and optimizing capture and separation
processes. Herein, we analyze the adsorption behaviour of light hydrocarbons
(methane, ethane, ethylene, propane, and propylene) in two synthesized
copper-based MOFs, Cu-MOF-74 and URJC-1. The experimental and computational
adsorption curves reveal a limited effect of the exposed metal centers on the
olefins. The lower interaction Cu-olefin is also reflected in the calculated
enthalpy of adsorption and binding geometries. Moreover, the diamond-shaped
pores' deformation upon external stimuli is first reported in URJC-1. This
phenomenon is highlighted as the key to understanding the adsorbent's
responsive mechanisms and potential in future industrial applications.
