NANOPARTICLE PREPARED POROUS SILICA GRANULATES AND THEIR APPLICATION AS OXYGEN CARRIER SUPPORTS FOR CHEMICAL LOOPING PROCESS

摘要

Chemical looping combustion (CLC) represents a promising approach to capture CO2 emissions in the fossil fuel powered energy generations. Oxygen carriers, composed of active metal oxides, play important roles in CLC process by transferring oxygen between oxidation and reduction reactors. To avoid the agglomeration of metallic phase during the reduction process and ensure a long-term activity, a porous support granulate with enhanced mechanical stability is highly required for the development of high performance oxygen carrier materials. In this work, with the integration of different pore formers (Pluronic F127, Carbon black and variation of moisture contents) and employment of cold-isostatic pressing (CIP), we have taken silica nanoparticles as the basic building blocks and fabricated large granulates (315- 500 um) with varied porous microstructures and enhanced mechanical stability.