首页> 外文期刊>Catalysis science & technology >Comparative study of 3D ordered macroporous Ce_(0.75)Zr_(0.2)M_(0.05)O_(2-δ) (M = Fe, Cu, Mn, Co) for selective catalytic reduction of NO with NH3
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Comparative study of 3D ordered macroporous Ce_(0.75)Zr_(0.2)M_(0.05)O_(2-δ) (M = Fe, Cu, Mn, Co) for selective catalytic reduction of NO with NH3

机译:3D有序的大孔CE_(0.75)Zr_(0.2)M_(0.05)O_(2-δ)(M = Fe,Cu,Mn,Co)的比较研究,用于选择性催化降低NH3

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摘要

The three dimensional ordered macroporous (3DOM) Ce_(0.75)Zr_(0.2)M_(0.05)O_(2-δ) (M = Fe, Cu, Mn, Co) is synthesized by a colloidal crystal template method for comparative study on selective catalytic reduction (SCR) of NO with NH3. The obtained catalysts are mainly investigated by the measurements of X-ray diffraction (XRD), N2 sorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction by hydrogen (H2-TPR), as well as temperature-programmed desorption of ammonia (NH3-TPD). The XRD, XPS and TPR analysis clarified the dopants are effectively doped into the Ce-Zr oxide solid solution, which contribute to the strong synergistic effect between the dopants and Ce-Zr oxides. Moreover, higher O_α/(O_α + O_β) ratio, improved surface reducibility and enhanced surface acidity are observed after the in situ doping. These facts lead to a better low temperature catalytic performance for the Ce_(0.75)Zr_(0.2)M_(0.05)O_(2-δ) catalysts. Particularly, the Co doped catalysts exhibit the highest active oxygen species, the highest reducibility as well as the strongest NH3 absorption ability, which corresponds to the significant increase of low temperature activity. Meanwhile, the specific surface area and pore volume are increased efficiently by Fe and Mn doping, which broadens the operating temperature window. Moreover, the strong interaction between the dopants and the Ce-Zr oxide solid solution could be ascribed to the good stability of those catalysts doped with Fe, Mn and Co.
机译:三维有序的大孔(3 dom)ce_(0.75)Zr_(0.2)m_(0.05)O_(2-δ)(2-δ)(M = Fe,Cu,Mn,Mn,Co)通过胶体晶体模板方法合成用于选择性研究的胶体晶体模板方法NH3的催化减少(SCR)。所获得的催化剂主要通过X射线衍射(XRD),N2吸附,透射电子显微镜(TEM),X射线光电光谱(XPS)的测量来研究。以及氨(NH3-TPD)的温度填充。 XRD,XPS和TPR分析阐明了掺杂剂有效地掺入CE-ZR氧化溶液中,这有助于掺杂剂和CE-ZR氧化物之间的强协同作用。此外,较高的O_α/(O_α +O_β)比,在原位掺杂后观察到了提高的表面降低性和增强的表面酸度。这些事实导致CE_(0.75)ZR_(0.2)M_(0.05)O_(2-δ)催化剂的低温催化性能更好。特别是,掺杂的催化剂表现出最高的活性氧,最高的可降低性和最强的NH3吸收能力,这与低温活性的显着增加相对应。同时,特定的表面积和孔体积通过Fe和Mn掺杂有效增加,从而扩大了工作温度窗口。此外,掺杂剂与CE-ZR氧化溶液之间的强相互作用可以归因于那些掺入Fe,Mn和Co的催化剂的良好稳定性。

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