Fundamental studies of carbon capture using CaO-based materials

Abstract

Detailed understanding of the mechanisms of fast stage CaO carbonation was given.

Heterojunction-redox catalysts of FexCoyMg10CaO for high-temperature CO2 capture and in situ conversion in the context of green manufacturing

“…(2) as O 2− has been assigned to the active site for CO2 adsorption in the CaL process (Eq. 3-5), 55 the presence of different valence states of doped Fe and Co oxides provides extra oxygen vacancies to facilitate the CO2 adsorption; 56 (3) the melt-intercalation of Fe2O3 into CaO through the hightemperature calcination and the high-temperature refractory of MgO successfully prevents CaO sintering, high stability is achieved.…”

Novel procedure of CO2 capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag

“…8,9 The reaction between CaO and CO 2 proceeds in two stages. [10][11][12][13] In the rst stage, CO 2 reacts rapidly with CaO to form dense calcium carbonate (CaCO 3 ). In the next stage, CO 2 in the gas phase can react with CaO only by diffusing through the initially formed layer of CaCO 3 products.…”

Mechanistic Understanding of CaO‐Based Sorbents for High‐Temperature CO2 Capture: Advanced Characterization and Prospects

“…Higher carbonation temperatures result in larger islands and lower island densities. At high conversions, the islands have merged into a CaCO 3 layer that fully covers the CaO surface as visualized by FIB‐TEM (Figure 4c) [44] . Figure 4c shows a CaO particle covered by a CaCO 3 layer with a thickness of about 90 nm.…”

“…At high conversions, the islands have merged into a CaCO 3 layer that fully covers the CaO surface as visualized by FIB-TEM ( Figure 4c). [44] Figure 4c shows a CaO particle covered by a CaCO 3 layer with a thickness of about 90 nm. A visualization of the morphology of the product layer at the end of the kinetically-controlled reaction regime has not been reported yet, due to the difficulty to 'freeze' the reaction exactly at the transition from the kinetically-controlled to the diffusioncontrolled reaction regime.…”