It can be used for pH correction of water or for its disinfection (with excess lime). Calcium oxide (CaO) is a solid which when wet changes into calcium hydroxide (Ca(OH)2), a strong base. I’m tempted to say they’re as different as chalk and cheese, despite both containing oxygen. For example, calcium carbonate (CaCO 3 ) produces carbon dioxide and calcium oxide (CaO). Many metal carbonates liberate CO 2 when they are heated. Hope this helps. The calcium oxide–carbon dioxide system in the pressure range 1—300 atmospheres E. H. Baker, J. Chem. Magnesium oxide or calcium oxide was impregnated to increase the adsorption of carbon dioxide and thus the surface diffusion effect. In reality the reaction is a two-step process, with formation of slaked lime in the first step and reaction of slaked lime with carbon dioxide to form calcium carbonate in the second. Carbon dioxide is produced when any form of carbon or almost any carbon compound is burned in an excess of oxygen. Topics covered include thermodynamics, kinetics, and heat and mass transfer as well as reactor design, modeling, and testing. ABSTRACTThis article presents a review of research in the field of solar thermochemical carbon dioxide capture based on calcium oxide looping. Calcium oxide is also known as lime and is most commonly used for many purposes. More importantly, lime has been used for a very long time to produce calcium carbonate by reaction with carbon dioxide. Natural sepiolite which mainly consists of magnesium oxide and silica showed the ability of carbon dioxide adsorption and could separate carbon dioxide from nitrogen at 600°C [5] . Capturing carbon dioxide (CO2) rather than releasing it into the atmosphere is one of the most promising strategies for helping to meet the aim of the ‘Paris Agreement’ to limit the average increase in global temperatures to 2 degrees Celsius by the end of the century.