显著的N2选择性增强NH3-SCO反应超过V0.5/Pt0.04/TiO2催化剂通过Cu-Er联合修饰
Yu Gao1, Zhitao Han2, You Tian3
1China Waterborne Transport Research Institute, Beijing, 100088, China.
Environmental science and pollution research international
|September 17, 2023
概括
-瓦尼催化剂的铜和联合修改显著提高了对氨选择性催化氧化 (SCO) 的选择性. CEV/PT-4催化剂在广泛的温度范围内实现了100%的氨转化和90%以上的选择性.
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:
- - (Pt-V) 双金属催化剂对氨选择性催化氧化 (SCO) 有希望.
- 对于Pt-V催化剂来说,同时实现高氨转化和选择性仍然是一个挑战.
- 开发有效的氨氧化催化剂对于环境应用至关重要.
研究的目的:
- 研究铜 (Cu) 和 (Er) 联合修改对V/Pt/TiO2催化剂NH3-SCO性能的影响.
- 优化Cu和Er的兴奋剂量,以提高催化活性和选择性.
- 了解结构 - 活动关系,从而提高性能.
主要方法:
- 合成了V0.5/Pt0.04/TiO2 (V/PT) 催化剂,这些催化剂中含有不同数量的Cu和Er.
- 系统评估NH3-SCO性能,包括氨转化和N2选择性.
- 使用诸如X射线衍射,BET表面积分析和in situ DRIFTS等技术进行材料表征.
- 对催化剂表面的氧化还原特性,表面酸度和活性物种的分析.
主要成果:
- 与Cu和Er共同修改显著提高了N2的选择性,而不会影响NH3的转化.
- CEV/PT-4催化剂表现出卓越的性能:100%的NH3转化率和>90%的N2选择性在225-450°C之间.
- 描述显示了增强的氧化还原特性,表面酸度,以及增加的Pt0和化学吸收氧气物种的丰度.
- 在现场,DRIFTS显示了 -NH2物种和酸盐物种之间的活性反应,用于生成N2.
结论:
- Cu和Er联合修改是一种有效的策略,可以提高NH3-SCO的Pt-V基催化剂的N2选择性.
- 与之前报告的催化剂相比,CEV/PT-4催化剂表现出更高的性能.
- 性能改善归因于增强的氧化还原特性,表面酸度,以及活性Pt0和氧物种的形成,促进了反应途径.
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