ABSTRACT
CO2 adsorption on solid sorbents under dynamic conditions is driven by a number of factors, among them textural features (pore volumes, pore size distribution, surface area…), surface chemistry (polarity, presence of active site and/or unsaturated coordinative sites…) and the overall active sites accessibility. Depending on the strength of the interaction with CO2 (chemisorption or physisorption), solid sorbents are broadly divided in two groups, although a sharp distinction between the two phenomena (in many cases concurrent) is obviously not possible. CO2 adsorption data acquired in a lab-scale fixed bed reactor under dynamic conditions and in typical conditions of post-combustion CO2 capture on materials produced from the work-up of carbonized rice husk were here reported and compared with pertinent literature on commercial and ad-hoc synthetized sorbents. Some attempts to correlate adsorption capacities and materials’ textural properties or other relevant adsorption parameters have been also proposed.
Acknowledgments
The authors thank Dr. Paola Giudicianni for BET analyses on rice husk-derived samples and Mr. Luciano Cortese for SEM imaging. The financial support of Piano Annuale della Ricerca Mise-CNR under the contract “Sistemi elettrochimici per l’accumulo di energia” was kindly acknowledged.