Advanced MnOx/TiO2 Catalyst with Preferentially Exposed Anatase {001} Facet for Low-Temperature SCR of NO

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• 作者：Shengcai Deng ; Tingting Meng ; Bolian Xu ; Fei Gao ; Yuanhua Ding ; Lei Yu ; Yining Fan
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：September 2, 2016
• 年：2016
• 卷：6
• 期：9
• 页码：5807-5815
• 全文大小：798K
• 年卷期：0
• ISSN：2155-5435

文摘

MnO_x/TiO₂ (anatase) nanosheets (NS) with a preferentially exposed {001} facet was found to be a better catalyst for selective catalytic reduction (SCR) of NO than conventionally employed MnO_x/TiO₂ nanoparticles (NP) with the {101} facet preferentially exposed, affording both high NO conversion and high N₂ selectivity at 80–280 °C. Further investigations indicated that Mn³⁺ as the major species on TiO₂ (NS) was incorporated into octahedral vacancies with a lower polymerization degree, resulting in high catalytic activity for SCR and low activity for NH₃ oxidation, thus restraining the undesirable N₂O generation. In comparison, on the surface of TiO₂ (NP), Mn⁴⁺ as the major species was incorporated into tetrahedral vacancies in a highly polymerized state, leading to lower NO conversion and lower N₂ selectivity. The results indicate that it is possible to enhance the low-temperature SCR activity of the catalysts by tailoring the preferentially exposed facet of TiO₂.