Alkali metal-resistant mechanism for selective catalytic reduction of nitric oxide over V2O5/HWO catalysts
نویسندگان
چکیده
A series of V2O5/HWO catalysts are prepared by hydrothermal and impregnation methods using different precursors, among which the V2O5/HWO-C catalyst exhibited optimal NH3-SCR performance. Compared to oxalic acid (O) water (W), commercial bacterial cellulose (C) as a precursor can firstly achieve more controllable synthesis form hexagonal WO3 (HWO) catalyst. Various characterization (XRD, N2-BET, TEM, SEM, XPS, EDX mapping, NH3/NO-TPD-MS) indicate that higher specific surface area, abundant active oxygen acidity result from The reason is HWO-C has an excellent smooth rod-shaped morphology, promotes high dispersion V2O5 on its surface. In situ IR results show SCR follows Langmuir-Hinshelwood (L-H) mechanism, where absorbed NOx intermediate species formed react with NH4+ NH3abs groups HWO. After loading 1.75 wt% K+, obtained K-V2O5/HWO-C exhibits effective resistance K poisoning SO2, retains 78 % conversion efficiency at 360 °C after 10 h, attributed capture K+ (1.04 wt%) in channels via new pathway, although approximately 0.71 located external weak bonding V2O5.
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ژورنال
عنوان ژورنال: Fuel
سال: 2021
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2021.121445