在基催化剂表面的酸氧化反应中揭示了CO耐受性机制
Zi-Han Chen1, Xing Chen1, Wei Kang1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Energy, College of Materials Xiamen University, Xiamen, 361005, China.
氧化反应 (HOR) 的催化剂被一氧化碳 (CO) 杂质中毒. 这项研究表明,PtRu和PtSn催化剂上的氧物种促进了CO氧化和溶解,从而提高了CO耐受性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 基于的催化剂对于燃料电池中的氧化反应 (HOR) 是至关重要的.
- 燃料中的一氧化碳 (CO) 杂质会通过中毒导致这些催化剂的快速失活.
- 在HOR催化剂中,CO耐受性的确切机制仍然是积极研究和辩论的领域.
研究的目的:
- 研究基催化剂在氧化反应 (HOR) 期间的CO耐受性机制.
- 阐明含氧物种和合金元素 (Ru,Sn) 在提高CO耐受性方面的作用.
- 为HOR应用的抗毒催化剂的合理设计提供见解.
主要方法:
- 设计和合成Au@PtX双功能核心外纳米催化剂.
- 在现场拉曼光谱检测和分析反应中间体 (*OH,金属-O, *CO) 在应用电位 (0.3V) 下.
- 在酸性介质中进行电化学测量,以评估催化剂性能和CO耐受性.
主要成果:
- Au@PtX纳米催化剂在酸性溶液中的HOR过程中表现出极好的CO耐受性.
- 现场拉曼光谱证实,PtRu和PtSn催化剂上的含氧物种有助于*CO氧化和脱落.
- Ru 增强了 Pt 上的 *CO 吸附,但 PtRu 的 CO 耐受性来自于双功能的 *CO 氧化; Sn 修改了电子结构以减少 Pt 上的 *CO 吸附,进一步提高了 PtSn 中的 CO 耐受性.
结论:
- 含氧物种在PtRu和PtSn催化剂的二氧化碳耐受性中发挥着关键作用,通过促进*CO氧化和脱氧.
- 将Pt与Ru或Sn合金提供了不同的途径,以提高HOR催化剂中的CO耐受性.
- 了解这些抗中毒机制为设计下一代燃料应用的强大的催化剂提供了宝贵的指导.
更多相关视频
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
相关概念视频
Catalysis
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
