Studies on HZSM-5 zeolite catalysts for desulfurization and denitrification

This article focused on the removal of NO and SO₂ from flue gas using HZSM-5 zeolite as carrier of 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-K₂SO₄-V₂O₅/HZSM-5 modified by cobalt and potassium sulphate had good activity and thermal stability. 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. The best desulfurization efficiency and denitrication efficiency could be up to 98.153% and 99.416% separately when being experimented combinedly.