The utilization of fly ash-MnOx/FA catalysts for NOx removal. (29th June 2018)

• Record Type: Journal Article
• Authors: Qi, Kai; Xie, Junlin; Mei, Di; He, Feng; Fang, De
• Is Part Of: Materials research express. Volume 5:Number 6(2018)
• Publication Date: 2018-06-29
• Subjects: selective catalytic reduction -- fly ash -- MnOx/FA catalysts -- mechanism; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/aacd8e
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: In paper, fly ash (FA for short, the solid waste from power plants) was chosen as the support and manganese acetate as the precursor of active components to prepare MnO x /FA catalysts using impregnation method. The technological conditions were discussed and the results show that catalysts calcined at 400 °C with Mn content of 25 wt% exhibit over 80% NO conversion at 160 °C. Spinel Mn3 O4 with mixed valency is the main phase in the catalysts, demonstrating the superiority in ion and electron transferring, redox properties and other abilities. Conclusion can be deduced that a promising prospect is just around the corner for catalysts with mixed valences. And the adsorption of reaction gases (NH3, NO and O2 ) indicates that Lewis acid sites exist mainly on MnO x /FA catalysts, and O2 prefers to enhance Brønsted acid sites. Finally, the cost reduction of catalyst preparation and the reuse of fly ash are achieved simultaneously.