相关实验视频

Updated: Sep 18, 2025

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

在操作条件下对双胞胎PtRh催化剂纳米粒子进行一致的X射线衍射成像

Lydia J Bachmann^1,2, Dmitry Lapkin³, Jan-Christian Schober^1,2

¹Centre for X-ray and Nano Science CXNS, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.

|June 25, 2025

概括

操作布拉格连贯X射线衍射成像显示,CO氧化增加了单个PtRh纳米粒子双边界的应变. 这一过程也形成了新的方面和位移,可能增强了催化活性.

科学领域:

材料科学材料科学材料科学
表面科学是一门学科.
催化剂是一种催化剂.

背景情况:

- (PtRh) 纳米粒子是关键的催化剂.
了解反应条件下的纳米粒子行为对于催化剂设计至关重要.

研究的目的:

通过运行布拉格连贯X射线衍射成像来研究CO氧化过程中单个PtRh纳米粒子的结构和应变演变.
为了将结构变化与催化活性相关联.

主要方法:

操作布拉格连贯X射线衍射成像被使用.
在不同条件下 (CO氧化,CO,O2) 研究了SrTiO3载体上的单个预定性PtRh纳米粒子.

主要成果:

一个 Σ3 双边界被观察到与支平行.
在CO氧化下,与纯CO或O2相比,在双边界上检测到增加的应变.
在氧化/还原周期中形成的新面.
混合边缘/螺杆位移出现在 {111} 面交的双边界.

结论:

二氧化碳氧化导致PtRh纳米粒子双边界的显著应变和结构变化.
脱位的形成改变了局部应变和原子结构,可能会产生更活跃的催化站点.
这些发现提供了关于纳米粒子在催化过程中的动态性质的见解.

关键词:

一致的衍射成像成像.移位移位移位移位移位不同质的催化剂.在现场条件下.一个单一的纳米粒子.压力压力压力压力双胞胎的边界是双胞胎的边界.

更多相关视频

$High Pressure Single Crystal Diffraction at PX^2$ 11:32

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

相关概念视频

$X-ray Diffraction of Biological Samples$ 01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...

X-ray Crystallography

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...