-EAB氧化物催化剂:一个有前途的候选人,具有优异的SO2中毒抗性NH3-SCR反应
Xiangqiong Jiang1, Yu Sun2, Rui Li3
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, IGCME, Sun Yat-sen University, Guangzhou 510006, China.
我们开发了Cu-EAB催化剂,用于氧化 (NOx) 的氨选择性催化还原 (NH3-SCR). Cu2.53-EAB催化剂表现出优异的NOx去除和SO2抵抗,性能优于商业催化剂.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 环境化学环境化学
背景情况:
- 使用氨 (NH3) 的选择性催化还原 (SCR) 对于从工业排放中去除氧化 (NOx) 是至关重要的.
- 二氧化硫 (SO2) 是一种常见的污染物,可以毒害SCR催化剂,降低其效率和寿命.
- 开发具有增强SO2耐受性的SCR催化剂对于实际应用至关重要.
研究的目的:
- 为了合成和评估Cu-EAB催化剂的NH3-SCR的NOx.
- 首次研究Cu-EAB催化剂对SO2中毒的抗性.
- 为了比较Cu-EAB与商业Cu-CHA催化剂在SO2暴露下的性能.
主要方法:
- 合成具有不同铜负载的Cu-EAB催化剂.
- 在不同条件下使用NH3-SCR评估NOx转换和N2选择性 (高空间速度,存在SO2).
- 硫化处理前后的催化剂的表征 (例如,使用现场流动),以了解中毒机制.
主要成果:
- 与Cu2.61-CHA相比,Cu2.53-EAB催化剂表现出更高的NOx转化和N2选择性.
- 2.53-EAB对SO2中毒具有显著的耐受性,暴露后性能稳定.
- 与Cu2.61-CHA相比,在400°C的硫化对Cu2.53-EAB活性的影响较小,这归因于特定的Cu2+物种位置.
结论:
- -EAB催化剂,特别是2.53-EAB,作为NH3-SCR应用的替代品显示出显著的希望.
- 催化剂增强的SO2抗性与EAB框架内的Cu2+物种的形成和分布有关.
- 在Cu2.53-EAB上进行NH3-SCR反应时,建议采用混合的Langmuir-Hinshelwood和Eley-Rideal机制.
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