The concept of cyclic redox conversion of carbonaceous fuels was proposed over half a century ago. �Rediscovered� as an effective approach for fossil fuel conversion and CO2 capture, the chemical looping concept has captured significant attention within the last two decades. In a CLC scheme, lattice oxygen in a solid oxygen carrier is used to fully oxidize a carbonaceous fuel, producing a stream of carbon dioxide and steam which can be easily separated. The reduced oxygen carrier is then transferred to a subsequent reactor for regeneration with air and/or steam. The cyclic redox operation avoids the needs for oxygen separation and reduces CO2 capture cost. To date, more than 700 oxygen carriers have been synthesized.More recent studies have led to development of Chemical Looping with Oxygen Uncoupling (CLOU) concept to increase the efficiency of solid fuel conversion. Given that CLOU is a type of CLC, the general principles are very similar. The only difference is that oxygen carriers should be thermodynamically capable of uncoupling their lattice oxygen at elevated temperatures and low oxygen partial pressures. In this way, the fuel reacts primarily with molecular oxygen detached from oxygen carrier's lattice. This increases the rate of fuel oxidation, especially for solid fuels. We investigate the effect of A-site and B-site substitution of perovskite based oxygen carriers for CLOU. The redox activity, recyclability, and structural stability are investigated. Potential strategies for oxygen carrier optimization are also discussed.

Mixed-oxides for carbonaceous fuel conversion with integrated CO<sub>2</sub> capture via chemical looping with oxygen uncoupling (CLOU)

248th National Meeting (2014)

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Mixed-oxides for carbonaceous fuel conversion with integrated CO2 capture via chemical looping with oxygen uncoupling (CLOU)

Mixed-oxides for carbonaceous fuel conversion with integrated CO₂ capture via chemical looping with oxygen uncoupling (CLOU)