Recent progress in the development of synthetic oxygen carriers for chemical looping combustion applications

Ambient and sub-ambient temperature direct air CO2 capture (DAC) by novel supported in situ polymerized amines

“…Notably, this activation energy closely aligns with our prior study on CO 2 adsorption in a long chain of polymers, where we obtained a value of 40.0 kJ mol −1 at 25% RH. 17 The thermodynamics of CO 2 adsorption onto MSF-C-EtOX were studied by solving the Van't Hoff equation (eqn (12)) and the Gibbs free energy equation (eqn (13)).…”

“…These solutions include reducing our reliance on fossil fuels, transitioning to green and renewable energy sources, and minimizing CO 2 point source emissions through methods such as chemical looping, oxy-combustion, amine absorption, or other CO 2 capture techniques before its release into the atmosphere. [9][10][11][12][13][14][15][16] However, it's important to note that these strategies primarily have the potential to slow the rate of increase of CO 2 in the atmosphere, as they may not fully address non-point sources of CO 2 emissions. 17,18 To address the challenge of increasing CO 2 concentrations and work towards achieving the goal of limiting the increase in Earth's average temperature to 1.5 °C or 2 °C by 2100, an alternative approach involves the use of negative emissions technologies (NETs).…”

Interactions between potassium ashes and oxygen carriers based on natural and waste materials at different initial oxidation states

“…A large number of synthetic metal oxides has been studied and investigated previously. Such oxygen carriers are usually made by impregnating an inert supporting substrate with a desired metal compound, which in its pure form does not have oxygen carrier performance but mechanical and chemical reliability 1 . Among the investigated oxygen carriers, it has been widely known that iron‐based materials are easy to obtain, inexpensive, environmentally sound, and, above all, have reasonable reactivity toward fuel 2 …”

“…Such oxygen carriers are usually made by impregnating an inert supporting substrate with a desired metal compound, which in its pure form does not have oxygen carrier performance but mechanical and chemical reliability. 1 Among the investigated oxygen carriers, it has been widely known that iron-based materials are easy to obtain, inexpensive, environmentally sound, and, above all, have reasonable reactivity toward fuel. 2 Since the production of synthetic oxygen carriers is expensive, it is of utmost importance to be able to find and use a more affordable yet suitable oxygen carrier materials.…”

Enhanced oxygen transfer rate of chemical looping combustion through lattice expansion on CuMn2O4 oxygen carrier

“…4–8 Chemical looping combustion (CLC) is known as oxy-fuel combustion technology, and its advantage is to generate electricity from fossil fuel while inherently capturing CO 2 (g) during the combustion process, avoiding the need for a CO 2 and NO x separation process. 9–11 In the CLC process, fuel combustion does not require air; it utilizes metal oxide as the oxygen carrier. In particular, fossil fuels, such as CH 4 (g), consume oxygen in the oxygen carrier, resulting in CO 2 (g) and H 2 O(g) production.…”