相关实验视频

Updated: Jul 7, 2025

Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis

Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis

Published on: February 12, 2019

吸附到干净和部分氧化的二氧化碳的表征 (211) 和111)

Diyu Zhang¹, Vladyslav Virchenko¹, Charlotte Jansen¹

¹Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.

The journal of physical chemistry. C, Nanomaterials and interfaces

|December 27, 2023

概括

这项研究比较了不存在缺陷的Cu111表面和阶段式Cu211表面上的一氧化碳吸附. 阶梯表面显示出明显的CO结合点和更快的氧化,影响了催化活性.

科学领域:

表面科学是一门学科.
不同质的催化剂.
材料化学材料化学

背景情况:

铜催化剂的活性与表面缺陷和氧化状态有关.
了解不同铜表面的吸附物行为对于催化是至关重要的.
之前的研究探讨了Cu{111},但像Cu{211) 这样的阶梯表面仍然不太了解.

研究的目的:

为了研究一氧化碳 (CO) 在阶段式Cu211表面上的吸附.
为了将Cu(211) 上的CO吸附行为与无缺陷的Cu(111) 表面进行比较.
描述表面结构和氧化对二氧化碳吸附的影响.

主要方法:

使用温度编程脱吸 (TPD) 来研究CO脱吸动力学.
采用反射吸附红外光谱 (RAIS) 来识别CO吸附地点.
应用奥格尔电子光谱 (AES) 来监测表面氧化.

主要成果:

211) 呈现出明显的二氧化碳吸附点:露台 (111-like) 和阶梯边缘点,在阶梯处结合更强.
在Cu(211) 上的CO吸附显示了由于二极管-二极管合的覆盖范围依赖的光谱变化.
211) 氧化速度比111快近10倍,形成2O,这改变了CO的结合能.

结论:

表面地形 (阶段) 显著影响CO吸附点和铜的结合强度.
铜表面的氧化改变了CO吸附特性,不同的晶体面具有不同的光谱特征.
这些发现为了解铜催化剂反应机制提供了必要的光谱数据.

更多相关视频

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

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

相关概念视频

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...