A chemical looping system that contains an oxidizer and a reducer is in fluid communication with a gas purification unit. The gas purification unit has at least one compressor, at least one dryer; and at least one distillation purification system; where the gas purification unit is operative to separate carbon dioxide from other contaminants present in the flue gas stream; and where the gas purification unit is operative to recycle the contaminants to the chemical looping system in the form of a vent gas that provides lift for reactants in the reducer.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 The subject matter of the present invention was developed under a research contract with the U.S. Department of Energy (DOE), Contract Number DE-FE0009484. The Government of the United States has certain rights in the invention.