TY - JOUR
T1 - Taming NO oxidation efficiency by γ-MnO2morphology regulation
AU - Chen, Lei
AU - Zhang, Jinping
AU - Li, Yuxin
AU - Wu, Xiaomei
AU - Zhang, Zaoxiao
AU - Lu, Qiang
AU - He, Chi
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2020.
PY - 2020/9/7
Y1 - 2020/9/7
N2 - Nitric oxide (NO) emitted from the combustion of fossil fuels has drawn global concern, and the oxidation of NO contributes greatly to the DeNOxprocess. Herein, single-crystal γ-MnO2catalysts with well-defined hollow-sphere-, sea-urchin-, and flower-like morphologies (γ-MnO2-HS, γ-MnO2-SU, and γ-MnO2-F) were rationally designed and synthesizedviaan environmental-friendly template-free hydrothermal strategy. The physicochemical properties of the prepared materials were characterized by XRD, FE-SEM, TEM, BET, XPS, H2-TPR, O2/NO-TPD andin situDRIFTS, and their catalytic activities in NO oxidation were evaluated. The results showed the γ-MnO2-HS sample possessed the highest activity and could oxidize 91.1% of NO at 275 °C, which was obviously higher than those of the γ-MnO2-SU and γ-MnO2-F catalysts. It was found that the presence of abundant surface-adsorbed oxygen and the largest quantity of Mn3+over the γ-MnO2-HS material respectively accelerated the processes of NO adsorption and O2activation, which greatly promoted the NO oxidation process. This work provides significant insights into NO oxidation over γ-MnO2catalysts.
AB - Nitric oxide (NO) emitted from the combustion of fossil fuels has drawn global concern, and the oxidation of NO contributes greatly to the DeNOxprocess. Herein, single-crystal γ-MnO2catalysts with well-defined hollow-sphere-, sea-urchin-, and flower-like morphologies (γ-MnO2-HS, γ-MnO2-SU, and γ-MnO2-F) were rationally designed and synthesizedviaan environmental-friendly template-free hydrothermal strategy. The physicochemical properties of the prepared materials were characterized by XRD, FE-SEM, TEM, BET, XPS, H2-TPR, O2/NO-TPD andin situDRIFTS, and their catalytic activities in NO oxidation were evaluated. The results showed the γ-MnO2-HS sample possessed the highest activity and could oxidize 91.1% of NO at 275 °C, which was obviously higher than those of the γ-MnO2-SU and γ-MnO2-F catalysts. It was found that the presence of abundant surface-adsorbed oxygen and the largest quantity of Mn3+over the γ-MnO2-HS material respectively accelerated the processes of NO adsorption and O2activation, which greatly promoted the NO oxidation process. This work provides significant insights into NO oxidation over γ-MnO2catalysts.
UR - https://www.scopus.com/pages/publications/85091131789
U2 - 10.1039/d0cy00573h
DO - 10.1039/d0cy00573h
M3 - 文章
AN - SCOPUS:85091131789
SN - 2044-4753
VL - 10
SP - 5996
EP - 6005
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 17
ER -