Oxygen carriers for Chemical-Looping with Oxygen Uncoupling (CLOU)

Book chapter, 2018

This chapter focuses on work related to oxygen carrier development, with emphasis on the research conducted in the last few years. It begins with a brief consideration of important thermodynamic criteria for types of oxygen carriers. In chemical-looping with oxygen uncoupling (CLOU) the oxygen carrier releases oxygen in the gas phase, which then reacts with the fuel through normal combustion, in contrast to chemical looping combustion (CLC), where the oxygen carrier reacts directly or indirectly with the fuel through a non-catalytic gas-solid reaction. The chapter surveys the development of CLOU materials and necessary requirements of these, and provides an overview of the experimental investigations that have been performed in the last couple of years. The difference between CLC and CLOU is the mechanism for oxidation of the fuel in the fuel reactor.