Experimental study on reduction of NO by CH4 over La0.8Sr0.2MnO3/α-Al2O3 in excess of O2

• Published in: Journal of the Taiwan Institute of Chemical Engineers Vol. 87; pp. 204 - 210
• Main Authors: Teng, Zhaohui, Zhang, Hang, Huang, Shan, Li, Na, Zhou, Qulan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2018
• Subjects: Catalyst; CH4; Perovskite; NO; Perovskite; O2; CH4; Catalyst
• ISSN: 1876-1070; 1876-1089
• DOI: 10.1016/j.jtice.2018.03.036

•Reduction of NO by CH4 over perovskite catalysis La0.8Sr0.2MnO3/α-Al2O3.•The effect of resident time, temperature and initial O2 concentration was studied.•O2 can fill oxygen vacancies in lattice and take part in reactions. Selective catalytic reduction of NO is necessary for the environment but the present adopted NH3-SCR has its weaknesses. This paper proposes CH4-SCR of NO with perovskite catalyst (La0.8Sr0.2MnO3/α-Al2O3) and experiments were done to study the effect of key factors (resident time, temperature and the initial O2 concentration). XRD patterns and SEM image show that La0.8Sr0.2MnO3 is a catalyst with perovskite structure and this kind of structure has been proved to be efficient in SCR. Experiments show that CH4 can convert NO efficiently in association with catalyst La0.8Sr0.2MnO3/α-Al2O3 and the max NO conversion ratio is over 90%. The longer the resident time is, the higher the conversion of NO is. The conversion of NO increased with the increase of temperature when the initial concentration of O2 ranged from 0% to 3% and moderate O2 at high temperatures can promote the reduction of NO by filling oxygen vacancies in lattice and taking part in the reactions. The new catalyst La0.8Sr0.2MnO3/α-Al2O3 could work efficiently in the widest range of oxygen concentration at 800 °C and it reached 90% with the oxygen concentration ranging from 4% to 6%. This research will provide further data to improve the process of SCR in the power plant. [Display omitted]