矿LaCrO3-支持Ru催化剂的界面金属支相互作用和催化性能
Haoran Yu1, Yehua Wang1, Xuyingnan Tao1
1Hefei National Research Center for Physical Science at the Microscale, University of Science and Technology of China, Hefei 230026, China.
ACS applied materials & interfaces
|April 1, 2024
概括
这项研究表明,LaRuCrO3催化剂中强烈的金属支相互作用增强了用于甲改革的鲁分散. 低加载催化剂在甲干式改制中表现出高活性和稳定性.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 界面金属支相互作用 (MSI) 对催化剂性能至关重要,特别是对于金属负载较低的贵金属催化剂.
- 了解MSI是设计高活性和稳定的催化剂的关键.
研究的目的:
- 通过sol-gel自燃方法合成具有不同低负载的LaRuCrO3催化剂.
- 调查MSI对分散和甲干重制 (DRM) 的催化活性的影响.
主要方法:
- 具有较低Ru负载的LaRu(x) Cr(1-x) O3催化剂的Sol-gel自燃合成 (x = 0.005,0.01,0.02).
- 金属支相互作用,鲁物种 (纳米粒子,表面原子,单个原子) 和界面结合 (Ru-O 键) 的表征.
- 在甲干改造 (DRM) 条件下对催化性能的评估.
主要成果:
- 由于鲁与LaCrO3支之间的Ru-O键,由于界面反应和电荷转移,观察到强大的MSI.
- 确定了多种类型的,包括纳米粒子,分散原子和单个原子.
- 拉鲁0.01Cr0.99O3催化剂 (0.42 wt%Ru) 在50小时的DRM测试中表现出极好的稳定性,碳沉积量微不足道.
- 在750°C实现了高CH4 (83%) 和CO2 (86%) 的转化,接近热力学平衡.
结论:
- 合成的LaRuCrO3催化剂表现出增强的MSI,导致高度分散的物种.
- 这些催化剂在干燥改制甲方面表现出卓越的活性和稳定性,即使在非常低的负载下也是如此.
- 这些发现突显了MSI工程在开发高效和成本效益的贵金属催化剂方面的潜力.
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