有效的Pt/KFI热酸催化剂,用于通过气选择性催化减少NOx
Ligang Zhang1, Yulong Shan2, Zidi Yan3
1School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China.
在KFI焦化物催化剂上有效地通过选择性催化还原 (H2-SCR) 净化内燃机 (HICE) 中的氧化 (NOx). 具有低负载的优化催化剂在广泛的温度范围内显示高NOx转换.
科学领域:
- 催化剂是一种催化剂.
- 环境科学 环境科学
- 汽车工程 汽车工程
背景情况:
- 内燃机 (HICE) 提供了更清洁的替代方案,但需要有效的氧化 (NOx) 排放控制.
- 选择性催化减排 (SCR) 是减少氧化物排放的关键技术.
研究的目的:
- 为了研究选择性催化降解 (H2-SCR) 的NOx比支持的KFI化催化剂.
- 为了优化催化剂的组成,并了解反应机制,以高效的NOx净化在HICEs.
主要方法:
- 一系列带有不同负载的Pt/KFI热酸催化剂的合成和表征.
- 动力学研究以确定反应顺序和阐明反应机制.
- 在模拟的HICE排气环境中评估催化剂性能.
主要成果:
- 负载低于0.1%的Pt/KFI热酸盐催化剂表现出最佳的NOx转化.
- 发现氧气通过消耗来抑制H2-SCR反应.
- (Ptδ+) 种,而不是金属Pt0,被确定为具有较低激活能量的活性位点.
- 根据动力学数据提出了Eley-Rideal (E-R) 反应机制.
- 使用混合催化剂的优化反应器设计在广泛的温度范围内实现了高NOx转换.
结论:
- 对于高化物中NOx的高效H2-SCR而言,KFI热带的低负荷至关重要.
- 了解白金物种和反应机制 (E-R) 的作用是催化剂设计的关键.
- 开发的催化系统显示出对HICE应用中的实际NOx排放控制的希望.
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