Experimental demonstration of pressurized chemical looping combustion in an internally circulating reactor for power production with integrated CO2 capture

•Internally circulating reactor (ICR) was demonstrated for chemical looping combustion at pressurized condition up to 6.0 bar.•The ICR is proposed and design to simplify the operation and scale-up of chemical looping processes at high-pressure.•The solids circulation rate was found to increase with increasing the operating pressure at a constant fluidization velocity.•CO2 capture efficiency and purity up to 97% was achieved, and found to be insensitive to the operating pressure.•Autothermal high-pressure CLC operation using ICR was achieved.