CO₂ Adsorption under Dynamic Conditions: An Overview on Rice Husk-Derived Sorbents and Other Materials

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.

KEYWORDS:

• CO₂ adsorption
• solid sorbents
• dynamic conditions
• carbonized rice husk
• lab-scale fixed-bed reactor
• post-combustion CO₂ capture

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.

Additional information

Funding

This work was supported by the Piano Annuale della Ricerca Mise-CNR “Sistemi elettrochimici per l’accumulo di energia.”