Monoethanolamine (MEA)/macroporous TiO 2 sorbent is a promising material for CO 2 separation because of its low energy demand. Similar to other CO 2 separation technologies, CO 2 desorption from the MEA/macroporous TiO 2 sorbent is the most energy-intensive step in the overall CO 2 separation process. The presence of water during the CO 2 desorption process leads to a significant increase in energy consumption. Therefore, CO 2 desorption in the absence of water is an important method to reduce energy consumption of CO 2 separation using MEA/macroporous TiO 2 , which is determined by several major factors, including desorption kinetics. However, the study on CO 2 desorption kinetics of supported MEA is lacking. This research was designed to make progress in this area. The CO 2 desorption kinetic model of the MEA/macroporous TiO 2 sorbent is experimentally derived with the data collected within the water-free desorption environment and theoretically proven by the pseudo-steady-state theory. The AvramiÀErofeyev mechanism controls the CO 2 desorption process, which is first-order with respect to RNH 3 + RNHCOO À , RNH 3 + , or RNHCOO À . The activation energy of the CO 2 desorption process is 80.79 kJ/mol. The kinetic characteristics of the CO 2 desorption are much superior to those associated with aqueous MEA-based CO 2 separation. The energy savings because of the use of MEA/macroporous TiO 2 for CO 2 separation not only results from avoiding the use of water, with its high specific heat capacity and high vaporization enthalpy, but also from the favorable desorption kinetics of the MEA/macroporous TiO 2 -based CO 2 separation.

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An alternative method for using monoethanolamine (MEA) in CO 2 separation is developed from the viewpoints of the MEAÀCO 2 reaction environment and the process of spent sorbent regeneration. MEAÀTiO 2 (MT) CO 2 sorbent is synthesized using pure MEA and a support material, TiO 2 . The performance of the MT sorbent on CO 2 separation was investigated in tubular reactors under various experimental conditions. The sorption capacity of the MT sorbent reached 1.09 mol-CO 2 /kg-MT at 45 wt % MEA. However, an optimum of 40 wt % MEA loading was chosen for most of the sorption tests. Temperature affected the CO 2 sorption capacity considerably, with optimum values of 45 °C for adsorption and 90 °C for regeneration, while humidity had a small positive effect. TiO(OH) 2 appears to be the best support material for MEA, but more evaluation is needed. The MT sorbent is regenerable, with a multicycle sorption capacity of ∼0.91 mol-CO 2 /kg-MT under the given experimental conditions.