Activation Strategies for Calcium-Based Sorbents for CO2 Capture: A Perspective

Ind. Eng. Chem. Res., 2012, 51 (4), pp 2133–2142

Activation Strategies for Calcium-Based Sorbents for CO₂ Capture: A Perspective

Fu-Chen Yu, Nihar Phalak, Zhenchao Sun, and Liang-Shih Fan*

fan.1@osu.edu

William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 West 19th Avenue, Columbus, Ohio 43210, United States

Abstract

The chemical looping process (CLP) using calcium-based sorbents to capture CO₂ through cyclic carbonation–calcination reaction (CCR) before, during, or after the conversion of carbonaceous fuel occurs, is a viable CO₂ control technology.

The basic process concept has been found to be attractive at larger scales. Additionally, process simulations based on experimental results indicate that the parasitic energy consumption for this high temperature process is relatively low compared to low temperature processes such as the amine-based process. The ability of the calcium-based sorbents to maintain stable reactivity and physical integrity in cyclic reaction under severe operating conditions is one of the most important criteria for the success of the calcium looping technology. Authors provide an overview of the optimization and reactivation strategies of calcium-based sorbents with focus on three methods—modification of precursors, addition of dopants and/or supports, and reactivation through steam/water hydration.

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