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首页> 外文期刊>Catalysis science & technology >FeVO4-supported Mn-Ce oxides for the low-temperature selective catalytic reduction of NOx by NH3
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FeVO4-supported Mn-Ce oxides for the low-temperature selective catalytic reduction of NOx by NH3

机译：FeVO4-supported Mn-Ce的氧化物低温选择性催化还原氮氧化物的氨

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摘要

Iron vanadate (FeVO4) nanorods are used as a carrier to support manganese (Mn) and cerium (Ce) oxides for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with NH3 for the first time. Among these developed Ce-Mn/FeVO4 catalysts with different molar ratios of Ce/Mn, the Ce0.2Mn0.2/FeVO4 catalyst exhibits the best de-NOx performance and N-2 selectivity, which are higher than 90% in a wide temperature window of 90-420 degrees C. Through a series of characterization techniques, it is found that the synergistic effect between Ce and Mn enhances the reduction ability and the number of acid sites on the catalyst, which facilitates the adsorption and conversion of flue gas. The introduction of an appropriate ratio of Ce/Mn increases the concentration of Mn4+ and chemisorbed oxygen (O-S) on the catalyst, leading to a "fast SCR reaction" with oxidizing NO to NO2, which significantly improves the low-temperature de-NOx efficiency. In addition, the interaction between the active components (Ce/Mn) and the support (FeVO4) increases the de-NOx performance of Ce0.2Mn0.2/FeVO4 at high temperatures. In the meantime, the Mn4+ + Ce3+ Mn3+ + Ce4+ reduction electron pair formed between Ce and Mn promotes the transport of electrons, which is also beneficial for the SCR reaction at low temperature. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reveals that the SCR reaction over Ce0.2Mn0.2/FeVO4 catalyst follows both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) reaction mechanisms.
机译：铁钒酸(FeVO4)用作纳米棒运营商支持(Mn)和铈锰(Ce)选择性催化还原的氧化物(SCR)的氮氧化物(NOx)和氨已经不是第一次了。催化剂不同摩尔比的Ce /锰、Ce0.2Mn0.2 / FeVO4展示最好的催化剂de-NOx性能和n - 2选择性,高于90%的在宽温度窗口90 - 420度c,通过一系列的表征技术,它是发现Ce和锰之间的协同效应提高了还原能力和酸网站的数量的催化剂,促进了吸附烟气和转换。一个适当的Ce /锰增加的比例Mn4 +和化学吸附氧的浓度(里)催化剂,导致“快速可控硅与氧化反应”没有NO2,大大提高了低温de-NOx效率。活性成分(Ce / Mn)和支持(FeVO4)增加的de-NOx性能Ce0.2Mn0.2 / FeVO4高温。减少电子对之间形成Ce和锰促进电子的运输,这是也有利于SCR反应较低温度。红外傅里叶变换光谱学(飘)揭示了SCR反应结束Ce0.2Mn0.2 / FeVO4遵循两种催化剂Eley-Rideal (e - r)和Langmuir-Hinshelwood (L-H)反应机制。

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