Oxidative Desulfurization Performance of CoAPO-5 Catalysts Synthesized by Novel Dynamic Hydrothermal Method

Abstract CoAPO-5 molecular sieves were synthesized by a novel dynamic method. Crystallization, morphology and surface acidity were investigated by XRD, SEM, and Py-IR in details, and compared with samples prepared by traditional static method. Synthesis conditions, reaction time, temperature and the amount of catalyst were optimized as important parameters. The desulfurization performance of CoAPO-5 catalysts synthesized by two different methods was evaluated and compared. Also, some experiments were carried out to test selectivity and regenerability of CoAPO-5 catalysts synthesized by the dynamic method. Finally, ODS reaction kinetics and mechanism using CoAPO-5 was studied and discussed. Results indicated that dynamic method greatly shortened crystallization time, while kept the same structure and sulfur removal capacity of CoAPO-5. The dynamic synthesis method could be considered as an alternative method to prepare porous molecular sieves.