NO reduction by methane over iron oxides: Characteristics and mechanisms. (15th November 2015)

• Record Type: Journal Article
• Authors: Su, Yaxin; Zhao, Bingtao; Deng, Wenyi
• Is Part Of: Fuel. Volume 160(2015)
• Page Start: 80
• Page End: 86
• Publication Date: 2015-11-15
• Subjects: NO reduction -- Methane -- Iron mesh roll -- Iron oxides; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2015.07.077
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: NO reduction by combination of methane and iron oxides was proposed. The combination of methane and iron oxides was effective to reduce NO. 100% NO reduction was demonstrated by 1.17% methane over iron oxides for 100 h at 1050 °C. More than 95% NO could be reduced by methane over iron oxides at fuel rich condition. Redox of iron between Fe 3+ ↔ Fe 2+ ↔ Fe due to methane played the critical effect for high NO reduction. Abstract: NO reduction by combination of methane and iron oxides was proposed and investigated in a one-dimensional ceramic tubular reactor at 300–1100 °C in N2 and simulated flue gas atmospheres. Iron mesh rolls were used as iron samples. The combination of methane and iron oxides was proved to have high effectiveness to reduce NO. 100% NO reduction was demonstrated by 1.17% methane over iron oxides for 100 h at 1050 °C in simulated flue gas containing 2.0% O2, 16.8% CO2 and 0.05% NO balanced by N2 . More tests proved that more than 95% NO could be reduced by methane over iron oxides at fuel rich condition in simulated flue gas atmospheres. XRD analysis showed that the redox of iron between Fe 3+ ↔ Fe 2+ ↔ Fe due to methane played the critical effect for high NO reduction. The mechanisms involving in NO reduction by iron and iron oxides reduction by methane were discussed.