Journal
CHEMICAL ENGINEERING JOURNAL
Volume 369, Issue -, Pages 46-56Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.03.052
Keywords
MnOx/CeO2 -ZrO2 nanorod catalyst; TiO2 modification; N2O formation; Redox property; Surface acidity; Low-temperature NH3-SCR reaction
Categories
Funding
- National Natural Science Foundation of China [21876168, 21507130]
- Youth Innovation Promotion Association of CAS [2019376]
- Chongqing Science & Technology Commission [cstc2016jcyjA0070, cstckjcxljrc13]
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In the present work, we chose MnOx/CeO2-ZrO2 nanorod (i.e., Mn/CZ-NR) as a benchmark catalyst, and used TiO2 as a modifier with the purpose of inhibiting the formation of N2O (by-product) as well as further enhancing the catalytic activity and H2O + SO2 tolerance of Mn/CZ-NR catalyst. These samples were characterized by TEM, HRTEM, XRD, Raman, H-2-TPR, XPS, NH3-TPD, and in situ DRIFTS. DeNO(x), performance and H2O + SO2 tolerance of these samples were evaluated by low-temperature NH3-SCR reaction. The obtained results show that the TiO2 modified catalyst (i.e., Mn-Ti/CZ-NR) exhibits higher catalytic activity than Mn/CZ-NR catalyst due to larger amount of oxygen vacancy accompanied with more Ce3+, higher ratios of Mn4+ and surface adsorbed oxygen species, as well as the improvement of surface acidity. Furthermore, TiO2 modification effectively inhibits the non-selective oxidation of NH3 to N2O through appropriately weakening the redox property of Mn/CZ-NR catalyst, which is beneficial to the enhancement of N-2 selectivity. Finally, Mn-Ti/CZ-NR catalyst exhibits excellent H2O + SO2 tolerance, which indicates that it has the potential to be used for practical low-temperature deNO(x), application.
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