Impact of gas composition (CO, H2, and HCl) on chemical looping combustion by SiO2 supported oxygen carriers

A great oxygen carrier for chemical looping combustion (CLC) supports the carbon capture activity. In this study, Fe2O3, NiO, and Mn2O3 are prepared on SiO2 support for test in CLC under various operating conditions. The best utilization value of 100 % was performed by 20%Fe2O3/SiO2 and stability was presented up to 10 redox cycles. 20%Fe2O3/SiO2 was used for the following study with the presence of HCl. Combination of HCl and CO in the inlet gas had insignificant changes. Differently, a drastic improvement achieved by combination with H2. However, the presence of HCl in multiple cycles test led to pore enlargement, surface area reduction, and decline in performance of 20%Fe2O3/SiO2. The presence of H2O and CO2 from the exhausted gas after the reaction indicated the efficient and complete reaction of the 20 % Fe2O3/SiO2. Besides, analysis of the reaction kinetics with Type I deactivation mode performed a well fitted result.