Alkali metal-resistant mechanism for selective catalytic reduction of nitric oxide over V2O5/HWO catalysts

Kang, Running, He, Junyao, Bin, Feng, Dou, Baojuan, Hao, Qinglan, Wei, Xiaolin, Nam Hui, Kwun and San Hui, Kwan (2021) Alkali metal-resistant mechanism for selective catalytic reduction of nitric oxide over V2O5/HWO catalysts. Fuel, 304. ISSN 0016-2361

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Abstract

A series of V 2O 5/HWO catalysts are prepared by hydrothermal and impregnation methods using different precursors, among which the V 2O 5/HWO-C catalyst exhibited the optimal NH 3-SCR performance. Compared to oxalic acid (O) and water (W), commercial bacterial cellulose (C) as a precursor can firstly achieve a more controllable synthesis to form hexagonal WO 3 (HWO) of V 2O 5/HWO-C catalyst. Various characterization (XRD, N 2-BET, TEM, SEM, XPS, EDX mapping, and NH 3/NO-TPD-MS) indicate that a higher specific surface area, abundant active oxygen and surface acidity result from the V 2O 5/HWO-C catalyst. The reason is that HWO-C has an excellent and smooth rod-shaped morphology, which promotes high dispersion of V 2O 5 on its surface. In situ IR results show that the SCR follows the Langmuir-Hinshelwood (L-H) mechanism, where absorbed NO x intermediate species are formed on the V 2O 5 and react with the NH 4 + and NH 3abs groups of V 2O 5 and HWO. After loading 1.75 wt% K +, the obtained K-V 2O 5/HWO-C catalyst exhibits effective resistance to K poisoning and SO 2, and retains 78 % NO x conversion efficiency at 360 °C after 10 h, attributed to the effective capture of K + (1.04 wt%) in HWO-C channels via a new pathway, although approximately 0.71 wt% K + are located on HWO-C external surface with weak bonding to V 2O 5.

Item Type: Article
Uncontrolled Keywords: alkali metal-resistant,commercial bacterial cellulose,poisoning,scr reaction,hwo catalyst,chemical engineering(all),fuel technology,energy engineering and power technology,organic chemistry ,/dk/atira/pure/subjectarea/asjc/1500
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Depositing User: LivePure Connector
Date Deposited: 18 Aug 2021 11:40
Last Modified: 24 Aug 2021 00:17
URI: https://ueaeprints.uea.ac.uk/id/eprint/81135
DOI: 10.1016/j.fuel.2021.121445

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