Photocatalytic removal of NOx in a circulating fluidized bed system

An endurance test of a photocatalyst composite is carried out for attrition using the CFB for long time operation. An observation by SEM-EDX revealed that a part of photocatalysts on the surface of the composites falls off at the initial stage of the solid circulation and others adhere to the composites tightly. In addition, the photocatalytic removal of NOx is also studied by measuring NO and NO2 concentration. The NOx removal efficiency depends on the solids volume fraction of photocatalyst composites in the riser of the CFB. The mechanism of the NOx removal by the photocatalyst composite in the CFB is thought to be divided into oxidation and adsorption processes. The adsorption process is regarded as more important than the oxidation processes in this experimental system.