Mn-Ce-Fe-Al mixed oxide nanoparticles via a high shear mixer facilitated coprecipitation method for low temperature selective catalytic reduction of NO with NH3

• Published in: Applied catalysis. A, General General, 2019-09, Vol.586, p.117237, Article 117237
• Main Authors: Tian, Junqi, Wang, Chao, Yu, Feng, Zhou, Xia, Zhang, Jie, Yang, Shengchao, Dan, Jianming, Cao, Peng, Dai, Bin, Wang, Qiang, Zhang, Jinli
• Format: Article
• Language: English
• Subjects: Aluminum; Ammonia; Catalysts; Catalytic activity; Coprecipitation; Denitration; High shear mixer; Iron; Low temperature; Low temperature catalysis; Manganese; Mixed metal oxide; Nanoparticles; Oxygen vacancies; Selective catalytic reduction; Selectivity
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2019.117237

[Display omitted] •Novel NH3-SCR catalyst was prepared by high shear mixer facilitated coprecipitation.•Mn-Ce-Fe-Al (HSM-CP) exhibited superior chemisorbed oxygen.•Mn-Ce-Fe-Al (HSM-CP) showed excellent low-temperature NH3-SCR activity.•Mn-Ce-Fe-Al (HSM-CP) showed good resistance to SO2/H2O.•Sulfation mechanism of Mn-Ce-Fe-Al (HSM-CP) was investigated. Mn-Ce-Fe-Al mixed metal oxide nanoparticles were produced via a co-precipitation method by using a high-speed mixer, and used as a catalyst for SCR reactions with NH3. The Mn-Ce-Fe-Al (HSM-CP) catalyst achieved a good physical structure with a BET surface area of approximately 224.3 m2/g, a pore volume of about 0.49 cm3/g, and an average pore diameter of about 8.89 nm. The Mn-Ce-Fe-Al (HSM-CP) processed more oxygen vacancies to promote catalytic activity at low temperature. The as-obtained Mn-Ce-Fe-Al (HSM-CP) had an enhanced low temperature selective catalytic reduction of NO with NH3 of 100% and N2 selectivity of 96.5% at 150 °C with a gas hourly space velocity of 15,300 h−1. The product still kept 50% NO conversion even at room temperature. The Mn-Ce-Fe-Al (HSM-CP) catalyst was effective at reducing the ammonia escape ratio across the entire temperature regime of the SCR reaction due to its strong surface acidity. The Mn-Ce-Fe-Al (HSM-CP) delivered almost zero N2O selectivity below 150 °C and presented potential applications in stationary industrial installations for environment friendly ultra-low temperature SCR.