在La0.9Ce0.1Co0.9Pd0.1O3-BaO/Al2O3催化剂上的H2/NOx反应过程的表征
Yu Lyu1, Gang Lyu1, Xiangyu Dong1
1State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China.
Journal of hazardous materials
|April 3, 2024
概括
一种新的La0.9Ce0.1Co0.9Pd0.1O3-BaO/Al2O3催化剂可以有效地将H2/NOx转化为NH3. 与传统基催化剂相比,这种催化剂表现出优越的性能和降低的N2O选择性,同时也节省了贵金属.
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:
- 开发有效的催化剂来减少NOx对于环境保护至关重要.
- 基于矿的材料为催化应用提供可调节的特性.
- 优化催化剂表面的氧化还原特性和活性物种是增强催化活性的关键.
研究的目的:
- 为了合成和描述一个新的La0.9Ce0.1Co0.9Pd0.1O3-BaO/Al2O3催化剂.
- 为了研究H2/NOx在合成的催化剂上的反应机制.
- 与传统催化剂相比,评估催化性能,包括NH3生产和N2O选择性.
主要方法:
- 合成La0.9Ce0.1Co0.9Pd0.1O3-BaO/Al2O3的催化剂. 这种催化剂的作用是:
- 温度编程减温/消毒/表面反应 (TPR/D/SR) 技术.
- 在现场的扩散反射里埃变换 (DRIFT) 光谱.
- 定量H2/NO反应的实验.
主要成果:
- 和合在LaCoO3中协同增强了氧化还原特性.
- 表面活性化酸盐具有不同的热稳定性,被确定为关键中间体.
- 在低温下,H2优先与被吸附的N2O4和单酸反应.
- 在350-450°C之间达到NH3最大度.
- 催化剂表现出优异的NH3生产,低的N2O选择性,与Pt-BaO/Al2O3相比节省了贵金属.
结论:
- 在La0.9Ce0.1Co0.9Pd0.1O3-BaO/Al2O3催化剂表现出色的性能为H2/NOx减少.
- 催化剂的结构和Ce和Pd的协同作用促进了高效的氧化还原特性.
- 了解表面酸盐和反应条件的作用 (例如,H2/NO比率>2.5) 对NH3形成有好处.
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