Abstract

FORERO, Carmen R.. High temperature behaviour of CuO-based oxygen carriers for chemical-looping combustion process. Ing. compet. [online]. 2014, vol.16, n.1, pp.35-47. ISSN 0123-3033.

Chemical-Looping Combustion (CLC) is a combustion technology with inherent CO2 separation. To scale up the CLC process materials suitable to work at high temperatures are needed. Cu-based oxygen carriers had been proved to fulfil the requirements although temperatures lower than 1073 K has been recommended. In this work, two Cu-based OCs have been developed by impregnation on different supports. The behaviour of the OCs was studied at temperatures above 1073K in a CLC continuous unit of 500 Wth taking into account aspects such as combustion efficiency, attrition, agglomeration and maintenance of the oxygen transport capacity and reactivity. Agglomeration or deactivation of the particles was never detected with neither of the oxygen carriers used. At these high temperatures, stable operation for more than 67 h was feasible only using an OC with ?Al2O3 modified with NiO addition as support. This is the first time that a Cu-based OC, prepared by a commercial manufacturing method, and used at 1173 K of fuel reactor temperature (TFR) and 1223 K of air reactor temperature (TAR) exhibits such a good properties. This result opens new possibilities for the application of Cu-based materials in industrial-scale CLC processes

Keywords : chemical-looping combustion; CO2 capture; copper; oxigen carriers.

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