Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 10, Issue 17, Pages 5996-6005Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cy00573h
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Funding
- China Postdoctoral Science Foundation [226679]
- National Natural Science Foundation of China [21677114, 21876139, 21922606]
- Key R&D Program of Shaanxi Province [2019SF-244, 2019ZDLSF05-05-02]
- Shaanxi Natural Science Fundamental Shaanxi Coal Chemical Joint Fund [2019JLM-14]
- Fundamental Research Funds for the Central Universities [xjj2017170]
- K. C. Wong Education Foundation
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Nitric oxide (NO) emitted from the combustion of fossil fuels has drawn global concern, and the oxidation of NO contributes greatly to the DeNO(x)process. Herein, single-crystal gamma-MnO(2)catalysts with well-defined hollow-sphere-, sea-urchin-, and flower-like morphologies (gamma-MnO2-HS, gamma-MnO2-SU, and gamma-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, H-2-TPR, O-2/NO-TPD andin situDRIFTS, and their catalytic activities in NO oxidation were evaluated. The results showed the gamma-MnO2-HS sample possessed the highest activity and could oxidize 91.1% of NO at 275 degrees C, which was obviously higher than those of the gamma-MnO2-SU and gamma-MnO2-F catalysts. It was found that the presence of abundant surface-adsorbed oxygen and the largest quantity of Mn(3+)over the gamma-MnO2-HS material respectively accelerated the processes of NO adsorption and O(2)activation, which greatly promoted the NO oxidation process. This work provides significant insights into NO oxidation over gamma-MnO(2)catalysts.
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