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通过水热法合成了两种具有不同形貌的α-Fe2O3纳米棒和纳米立方体,并探索了它们的中温NH3选择性催化还原(NH3-SCR)NO的活性.NH3-SCR测试表明α-Fe2O3纳米棒具有更高的催化活性.X射线粉末衍射(XRD)、场发射扫描电镜(FE-SEM)和高分辨透射电镜(HRTEM)结构分析表明:α-Fe2O3纳米棒暴露有高表面能的{110}活性面,而纳米立方体暴露的主要是低表面能的{012}晶面.H2程序升温还原(H2-TPR)和NO程序升温脱附(NO-TPD)结果证明纳米棒比纳米立方体具有更高的氧化还原性能.因此,α-Fe2O3纳米棒由于暴露高表面能的活性面具有比纳米立方体更高的NH3-SCR性能.
Two kinds of α-Fe2O3 nanorods and nanocubes with different morphologies were synthesized by hydrothermal method and the activity of NO3 at neutral temperature NH3-SCR was explored.The results of NH3-SCR showed that α-Fe2O3 The nanorods have higher catalytic activity.X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HRTEM) structural analysis show that: α-Fe2O3 nanorods exposed high surface energy { 110} active surface, while the nanocubes exposed mainly {012} planes with low surface energy.The results of H2 temperature-programmed reduction (H2-TPR) and NO-temperature programmed desorption Thus, α-Fe2O3 nanorods have higher NH3-SCR performance than nanocubes due to the high surface energy-exposed active surface.