低温CeCoMnOx螺旋式催化剂,通过酸盐共沉制备,用于使用NH3进行NO的选择性催化降解:一项结构-活性关系研究
Hongliang Zhang1, Fengcai Wang1, Jianjian Lou1
1Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Ma'anshan 243002, China; Analysis and Testing Central Facility, Anhui University of Technology, Ma'anshan 243002, China.
通过酸盐共同降水制备的新型CeCoMnOx催化剂在使用NH3 (NH3-SCR) 的低温选择性催化降低NO方面表现优异. 这些催化剂具有增强的性能,导致NO转化明显高于传统方法.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 环境化学环境化学
背景情况:
- 使用氨 (NH3-SCR) 的氧化 (NOx) 的选择性催化还原 (SCR) 对于控制空气污染至关重要.
- CeCoMnOx旋转型催化剂对NH3-SCR有效,通常通过性共同沉制备.
- 传统方法可能无法完全优化低温应用的催化剂性能.
研究的目的:
- 开发和评估CeCoMnOx螺旋类型的催化剂,这些催化剂是通过酸性酸盐共同沉为NH3-SCR.制备的.
- 系统地比较酸盐沉催化剂的物理化学结构和催化活性与传统氨共沉的催化剂.
- 阐明负责提高性能的结构-活动关系和反应机制.
主要方法:
- 合成CeCoMnOx旋转型催化剂,在各种烧温度下使用酸性酸盐共同沉.
- 使用诸如X射线光电谱 (XPS) 和现场扩散反射红外里埃变换谱 (in situ DRIFTS) 等技术,对催化剂物理化学性质的表征.
- 通过在一系列反应温度范围内测量NO转化来评估NH3-SCR活性.
主要成果:
- 通过氧化物共同降水 (CeCoMnOx-C) 制备的CeCoMnOx催化剂表现出较高的特异性表面积,更多的介质孔,和增加的表面活性位相比,共同降水 (CeCoMnOx-N) 制备的催化剂.
- CeCoMnOx-C表现出更强的氧化还原和吸附激活特性,这对于高效的NH3-SCR至关重要.
- 在400°C的化中,CeCoMnOx-C-400实现了超过89%的NO转化,在100-125°C之间达到近100%,在相同的温度范围内,CeCoMnOx-N-400的性能比CeCoMnOx-N-400高14.8%-2.5%.
结论:
- 酸性酸盐共同沉是制备CeCoMnOx旋转型催化剂的优质方法,用于低温NH3-SCR.
- 增强的低温活性归因于改善的表面积,氧化还原特性和吸附特性.
- 该研究揭示了增强的氧化还原和酸循环匹配,以及对氧酸盐衍生催化剂的改进的Eley-Rideal和Langmuir-Hinshelwood反应机制.
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