Chemical Looping Processes: Role of Metal Oxides
L.- S. Fan
Department of Chemical and Biomolecular
The Ohio State University
Columbus, Ohio 43210
The concept of chemical looping reactions has been applied to processes used in chemical industries. Fundamental and applied research on chemical looping reactions in energy systems has been extensively carried out. Fossil fuel chemical looping applications started with the steam-iron process using syngas from coal as feedstock in the 1900s through the 1940s and were demonstrated at a pilot scale with the carbon dioxide acceptor process in the 1960s and 1970s. There are presently no chemical looping processes using carbonaceous fuels in commercial operation. However, with CO2 emission from fossil fuel usage that is now of great concern, interest is high in chemical looping technology applications for CO2 capture.
Chemical looping technology is a manifestation of the interplay among all the key elements of particle science and technology including particle synthesis, reactivity and mechanical properties, flow stability and contact mechanics, gas-solid reaction engineering and particulates system engineering. This presentation will describe the fundamental and applied aspects of modern chemical looping technology that utilizes fossil and other carbonaceous feedstock. Specifically, it will discuss the characteristics of metal oxide evolution characteristics in morphology, nano-, micro- and macro- structures and transport of electron, ion, and defect during the redox processes using fossil feedstock. The impact of these characteristics on the performance of the chemical looping reactions will be elaborated.
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