优化Pt-Co合金纳米粒子用于逆水气转移激活CO2
Ákos Szamosvölgyi1, Ádám Pitó1, Anastasiia Efremova1
1Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.
概括
将双金属- (Pt-Co) 纳米粒子调整到支上,提高了它们在逆水-气转移反应中的性能. 最佳的Pt:Co比为1.51,显著提高了活性和一氧化碳的选择性.
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.
- 纳米技术纳米技术
背景情况:
- 双金属纳米粒子提供可调节的电子和催化性能.
- - (Pt-Co) 系统对各种催化应用具有前景.
- 优化纳米粒子组成对于提高催化效率至关重要.
研究的目的:
- 为了合成和表征Pt-Co双金属纳米颗粒具有不同的Co.含量.
- 评估这些纳米粒子在逆水气转移 (RWGS) 反应中的催化性能.
- 了解受Pt:Co比率影响的结构-活动关系.
主要方法:
- 合成8纳米的Pt-Co纳米粒子,其Pt:Co比为3.54,1.51,0.96.
- 纳米颗粒的固定在MCF-17半孔基体上.
- 使用HR-TEM,HAADF-TEM,EDX,XRD,BET,ICP-MS,in situ DRIFTS和近似in situ XPS进行表征.
- 在RWGS反应 (CO2:H2 = 1:4) 中从200-700°C在大气压下进行催化试验.
主要成果:
- 所有Pt-Co双金属催化剂的性能都超过了纯Pt基准.
- 1.51的Pt:Co比表明活动增加了2.6倍,并且在500°C时CO选择性得到了4%的改善.
- 增加的含量导致更强的电子积累和合金效应.
- 由于面部中心立方体结构,格式路径在所有催化剂中对CO生产占主导地位.
结论:
- 最佳的Pt:Co比为1.51,最大限度地提高了有利的电子相互作用和合金效应,以增强RWGS催化.
- 进一步增加的含量 (Pt:Co比为0.96) 降低了活性,表明了电子丰富的Pt位点的损失.
- 双金属Pt-Co纳米粒子在RWGS反应中优于单金属Pt,具有特定的组成,产生最佳结果.
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