Studies On HZSM-5 Zeolite Catalysts For Desulfurization And Denitrification

This article focused on the best carrier of desulfurization and denirification catalysts. The loading and modification of desulfurization catalyst V2O5/HZSM-5 were studied, and the best preparation procedure of denitrification catalyst Ni-Cu-Ce-La-HZSM-5 was investigated.Results showed that the best loading of V2O5 was 8%. CoO-K2S04-V205/HZSM-5 modified by cobalt and potassium sulphate had good activity and thermal stability. XRD and TEM results show modification with CoO, K2SO4 and MoO3 has little impact on the crystalline grain of carrier and catalysts. While the pore volume and pore diameter of CoO-K2SO4-V2O5/HZSM-5 get bigger.And the best preparation procedure of Ni-Cu-Ce-La-HZSM-5 was that HZSM-5 was acidulated by sulfuric acid solution firstly; and nickel ion exchange was implemented secondly; then the pH of the solution was adjusted to 7.8 thirdly when copper, cerium and lanthanum ion exchange was being implemented; and lastly, the catalyst could be produced after being dried and roasted. And acidic condition is conducive for nickel ion exchange, while pH=7.8 is conducive for copper, cerium and lanthanum ion exchange.Compared with technologies for desulfurization and denitrification separately, combined removal reaction is better. When the airspeed is 38.96min-1, the best desulfurization efficiency and denitrication efficiency could be up to 98.153% and 99.416% separately when being experimented combinedly.