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Identifying an economic alternative to nickel oxide that is non-toxic, and stable over thousands of cycles continues to drive chemical-looping process development. Mineral ores meet many of these criteria and ilmenite is prominent among the ores tested to date. However, pyrolusite, a manganese oxide containing more than 85% amorphous MnO2 in its fresh form, can transfer more than 3 times oxygen compared...
Secondary ilmenite is an inexpensive mineral that is a potential oxygen carrier for the chemical looping process. It has excellent mechanical stability, adequate heat capacity to transfer heat from the air reactor to the fuel reactor, and possesses a modest oxygen transfer capacity. Fresh and preoxidized ilmenite can transfer up to 1.7% and 1.2% oxygen on a mass basis, when reduced for 2min with CO...
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