在碳支持的定制PtGa脱催化剂中,Ga促进和金属氧化物接口的影响
Enzo Brack1, Milivoj Plodinec1,2, Marc-Georg Willinger2
1Department of Chemistry and Applied Biosciences ETH Zurich Vladimir Prelog Weg 2/10 CH-8093 Zurich Switzerland ccoperet@ethz.ch.
Chemical science
|November 29, 2023
概括
在 (Pt) 催化剂中促进 (Ga) 增强了脱的选择性. 这项研究开发了一种新方法,在碳上制造PtGa纳米粒子,揭示GaGa.
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:
- 脱对于生产来说至关重要.
- 基于 (Pt) 的催化剂被广泛使用,像 (Ga) 这样的促进剂显示了计算的前景.
- 传统的氧化物支阻碍了Ga作用的实验验证.
研究的目的:
- 开发一种用于制备Pt和PtGa纳米颗粒的新方法,在碳支上使用受控接口.
- 实验性地研究PtGa纳米粒子的结构和电子特性.
- 阐明Ga促进和氧化物接口对脱的催化性能的影响.
主要方法:
- 表面有机金属化学 (SOMC) 与热解分子前体相结合.
- 在碳支上制备Pt和PtGa纳米颗粒,有或没有氧化物接口.
- 使用电子显微镜和X射线吸收近边缘结构 (XANES) 的表征.
主要成果:
- 一种新的方法成功地产生了Pt和PtGa纳米粒子,它们在碳上具有定制的接口.
- 的引入导致同质,无形的PtGa合金的形成,与晶体Pt纳米粒子不同.
- 一个氧化物接口稳定了小颗粒,但由于副作用,减少了的选择性.
结论:
- 开发的方法允许对纳米粒子接口进行精确的控制,以便进行先进的表征.
- 实验结果支持关于Ga在PtGa催化剂中的作用的计算预测.
- 了解氧化物接口的影响解释了工业上使用添加剂来管理选择性.
更多相关视频
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
3.5K
09:02Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
7.8K
相关概念视频
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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...
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...
3.3K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called 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...
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...
12.1K