Tailoring the proceeding of the NH3-SCO and NH3-SCR reactions over FeOx catalysts by modifying with NbOx

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-08-30 DOI:10.1016/j.joei.2024.101814
Dong Ye , Kai Zhu , Yiwei Zhang , Jingyi Feng , Shujie Gao , Xiaoxiang Wang , Ke Wu
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Abstract

This study presents the synthesis of a series of FeOx-NbOx mixed oxide catalysts for the selective catalytic reduction (SCR) of NO by NH3. By meticulously controlling the Fe/Nb molar ratio, we have rationally tailored the proceeding of the main reaction of NO reduction and the side reaction of NH3 oxidation to NOx. The incorporation of NbOx introduced a significant number of acid sites, which enhanced the adsorption of NH3 on the catalyst surface, particularly at elevated temperatures. Additionally, the oxidative capacity of the catalyst was moderated by the addition of NbOx, hindering the over-oxidation of NH3 to NO or NO2, thus preserving more NH3 to act as a reductant for NO reduction. Consequently, the NbOx-enriched samples exhibited improved deNOx performance. However, an excessive amount of NbOx led to a notably weakened oxidative ability, which negatively impacted the activation of reactants and resulted in decreased NO conversion at lower temperatures. The optimized catalyst presented >80 % NO conversion and >95 % N2 selectivity within a temperature range of 250–400 °C. These findings offer valuable insights for the development of new catalysts with an extended operational temperature window.

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通过氧化铌改性调整 FeOx 催化剂上 NH3-SCO 和 NH3-SCR 反应的进程
本研究介绍了一系列用于 NH3 对 NO 的选择性催化还原 (SCR) 的 FeOx-NbOx 混合氧化物催化剂的合成。通过精心控制铁/铌摩尔比,我们合理地调整了氮氧化物还原主反应和 NH3 氧化为氮氧化物副反应的进行。NbOx 的加入引入了大量酸性位点,从而增强了催化剂表面对 NH3 的吸附,尤其是在高温条件下。此外,NbOx 的加入还缓和了催化剂的氧化能力,阻碍了 NH3 过度氧化为 NO 或 NO2,从而保留了更多的 NH3 作为还原剂用于还原 NO。因此,富含氧化铌的样品具有更好的脱硝性能。然而,过量的氧化铌会导致氧化能力明显减弱,从而对反应物的活化产生负面影响,并导致在较低温度下氮氧化物的转化率降低。优化后的催化剂在 250-400 °C 的温度范围内具有 80% 的 NO 转化率和 95% 的 N2 选择性。这些发现为开发具有更宽工作温度窗口的新型催化剂提供了宝贵的启示。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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