Synergistic effect of arsenic and different potassium species on V2O5-WO3/TiO2 catalyst poisoning: Comparison of Cl−, SO42− and NO3− anions
Handan Zhang, Ming Kong, Zelong Cai, Lijun Jiang, Qingcai Liu, Jian Yang, Shan Ren, Jiangling Li, Minghua Duan
Abstract
Arsenic and potassium species were considered as the major poisons for V2O5-WO3/TiO2 catalyst deactivation. However, their synergistic impacts were rarely reported and the role of anions (Cl−, SO42− and NO3−) were ignored. Therefore, a series of work were conducted in this research. Results indicated that the co-effect of (As+K) was more serious than the additive effect of single poison. Both physical and chemical properties changes were responsible for this phenomenon. Except for the negative effect of As2O3 and K cation, different anions also presented different impacts on catalyst redox ability and ammonia adsorption capacity, which further inhibited NH3-SCR reactions.