Mn-based catalysts supported on γ-Al2O3, TiO2 and MCM-41: a comparison for low-temperature NO oxidation with low ratio of O3/NO. Issue 31 (25th May 2021)

• Record Type: Journal Article
• Authors: Liu, Lijun; Shen, Boxiong; Si, Meng; Yuan, Peng; Lu, Fengju; Gao, Hongpei; Yao, Yan; Liang, Cai; Xu, Hongjie
• Is Part Of: RSC advances. Volume 11:Issue 31(2021)
• Page Start: 18945
• Page End: 18959
• Publication Date: 2021-05-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra01820e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The Mn/γ-Al2 O3 catalyst exhibited excellent performance for NO conversion in the presence of a low ratio of O3 /NO, which was due to the coexistence of Mn 3+ and Mn 4+ and abundant chemically adsorbed oxygen. Abstract : Mn-Based catalysts supported on γ-Al2 O3, TiO2 and MCM-41 synthesized by an impregnation method were compared to evaluate their NO catalytic oxidation performance with low ratio O3 /NO at low temperature (80–200 °C). Activity tests showed that the participation of O3 remarkably promoted the NO oxidation. The catalytic oxidation performance of the three catalysts decreased in the following order: Mn/γ-Al2 O3 > Mn/TiO2 > Mn/MCM-41, indicating that Mn/γ-Al2 O3 exhibited the best catalytic activity. In addition, there was a clear synergistic effect between Mn/γ-Al2 O3 and O3, followed by Mn/TiO2 and O3 . The characterization results of XRD, EDS mapping, BET, H2 -TPR, XPS and TG showed that Mn/γ-Al2 O3 had good manganese dispersion, excellent redox properties, appropriate amounts of coexisting Mn 3+ and Mn 4+ and abundant chemically adsorbed oxygen, which ensured its good performance. In situ DRIFTS demonstrated the NO adsorption performance on the catalyst surface. As revealed by in situ DRIFTS experiments, the chemically adsorbed oxygen, mainly from the decomposition of O3, greatly promoted the NO adsorption and the formation of nitrates. The Mn-based catalysts showed stronger adsorption strength than the corresponding pure supports. Due to the abundant adsorption sites provided by pure γ-Al2 O3, under the interaction of Mn and γ-Al2 O3, the Mn/γ-Al2 O3 catalyst exhibited the strongest NO adsorption performance among the three catalysts and produced lots of monodentate nitrates (–O–NO2 ) and bidentate nitrates (–O2 NO), which were the vital intermediate species for NO2 formation. Moreover, the NO–TPD studies also demonstrated that Mn/γ-Al2 O3 showed the best NO desorption performance among the three catalysts. The good NO adsorption and desorption characteristics of Mn/γ-Al2 O3 improved its high catalytic activity. In addition, the activity test results also suggested that Mn/γ-Al2 O3 exhibited good SO2 tolerance.