Recently, due to the reduction and sequestration of CO2, O2 inhalation combustion processes have been developed extensively for use in, among others, the iron, steel and incineration industries. In these industries, O2 needs to be at least 95% purity to be used cost-effectively in fuel combustion, because of the carbon tax placed on CO2 capturing. Oxygen combustion processes can contribute to the energy saving and CO2 capturing due to high combustion energy and pure CO2 effluent. A parametric study was performed to improve and optimize the cyclic performance of three-bed PVSA process. Since the concentration wave fronts of each air component was controlled by equilibrium adsorption amount in zeolite 10X bed, the adsorption pressure and feed flow rate of zeolite 10X bed concerning adsorption amount played as key operating variables in the air bulk separation. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 10/30/2005-11/4/2005).