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Indexed by:期刊论文

Date of Publication:2019-01-30

Journal:INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

Included Journals:SCIE、Scopus

Volume:58

Issue:4

Page Number:1525-1534

ISSN No.:0888-5885

Key Words:Catalysts; Catalytic oxidation; Ion exchange; Nitrates; Oxidation; Oxygen vacancies; Ozone; Ozone water treatment; Ozonization; Paramagnetic resonance, Catalytic ozonation; Exchange-time; Iron nitrates; Liquid ion exchange; Low concentrations; NO oxidation; Structure and properties; Superoxide radical, Iron oxides

Abstract:A series of SAPO-34 supported iron oxide (FeOx/SAPO-34) catalysts were prepared by a two-step liquid ion-exchange method. The effects of the exchange time and iron nitrate concentration on the structure and properties of the catalysts were investigated. The results showed that the FeOx/SAPO-34 catalysts significantly enhanced the ozonation of NO. The 0.05-FeOx/SAPO-34-15 catalyst prepared by mixing NH4+/SAPO-34 with 0.05 M iron nitrate solution for 15 h showed the most effective NO oxidation. Oxygen vacancies acted as the active sites for the catalytic oxidation of NO. The electron paramagnetic resonance results showed that the hydroxyl and superoxide radicals generated from ozone and the oxygen vacancies on the surface of the catalysts promoted the oxidation of NO. The 0.05-FeOx/SAPO-34-15 catalyst has a certain stability when the volume fraction of water vapor is in the range 0-8%.