Sol–Gel-Derived NiO/NiAl2O4 Oxygen Carriers for Chemical-Looping Combustion by Coal Char

Chemical-looping combustion (CLC) is a very promising technology to combine the energy-utilization situation in China and CO2 zero-emission in situ allowing for CO2 sequestration by efficient and energy-saving ways and without nitrogen oxide (NOx) formation. Having an oxygen carrier with sufficient reactivities in reduction and oxidation and enough recyclability and strength for long-term operation is one of the key issues of the CLC process. This paper focuses on the investigation of Ni-based oxygen carriers for CLC by coal char. First, Al(OC3H7)3 and Ni(NO3)2 are selected as the main raw materials to prepare sol–gel-derived NiO/NiAl2O4 oxygen carriers. The oxygen carrier with a mass content of 60% NiO, a sintering temperature of 1300 °C, and a sintering time of 6 h performs comparatively well. Second, the reduction reaction of the NiO/NiAl2O4 oxygen carriers with char and the circular reduction/oxidation reactions of the NiO/NiAl2O4 oxygen carriers with char/air or hydrogen/air are carried out in a ther...

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