In Situ Dilatometry Measurements of Deformation of Microporous Carbon Induced by Temperature and Carbon Dioxide Adsorption under High Pressures

Adsorption-based carbon dioxide capture, utilization, and storage technologies aim to mitigate the accumulation of anthropogenic greenhouse gases that cause climate change. It is assumed porous carbons as adsorbents are able demonstrate effectiveness these over a wide range temperatures pressures. The present study aimed investigate temperature-induced changes in dimensions microporous adsorbent Sorbonorit 4, well adsorption, by using situ dilatometry. nonmonotonic 4 under vacuum were found with increasing temperature from 213 573 K. At T > 300 K, thermal linear expansion coefficient exceeded graphite crystal, reaching 5 × 10−5 K at CO2 adsorption onto gave rise its contraction low pressures or high entire pressure range. An inversion dependence adsorption-induced deformation (AID) Sorbonorit-4 was observed. AID differential isosteric heat plotted function uptake varied within same intervals values, reflecting state adsorbed molecules caused contributions adsorbate–adsorbent adsorbate–adsorbate interactions. A simple model nanoporous randomly oriented nanocrystallites interconnected disordered phase proposed represent adsorption- macroscopic granules.