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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

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Updated: Jun 3, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

高耐用的Rh单原子催化剂通过表面缺陷调节Fe-Ce氧化物固体溶液上的表面缺陷.

Gunjoo Kim¹, Seokhyun Choung², Jae-Eon Hwang¹

¹Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, South Korea.

Angewandte Chemie (International ed. in English)

|January 8, 2025

概括

此摘要是机器生成的。

具有在铁氧化物支上固定的单原子催化剂在选择性催化降解氧化物 (NOx) 与一氧化碳 (CO) 中表现出更好的性能. 这种持久的催化剂设计提供了卓越的活性和稳定性.

关键词:

耐久性耐久性耐久性是的元素之一.选择性催化还原选择性催化还原单个原子催化剂的催化剂.表面缺陷表面缺陷

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

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Last Updated: Jun 3, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

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Published on: September 20, 2012

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

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.
表面化学表面化学

背景情况:

单原子催化剂 (SAC) 对于高效的化学转换至关重要.
催化剂支上的缺陷点可以固定单个金属原子以提高反应性.
铁 (Fe-Ce) 氧化物固体溶液为催化剂设计提供独特的表面特性.

研究的目的:

准备和表征单个原子 (Rh ₁) 在一个Fe-Ce氧化物支 (FC).
评估Rh₁/FC在氧化物与一氧化碳 (CO-SCR) 的选择性催化还原中的性能.
在反应条件下研究SAC的结构稳定性和反应机制.

主要方法:

在Fe-Ce氧化物支上使用缺陷点合成Rh₁/FC.
使用先进的光谱和理论方法对催化剂进行表征.
评估CO-SCR活动和耐用性在高温下.
在现场进行DRIFTS和DFT计算,以研究反应中间体和机制.

主要成果:

与对照组相比,Rh₁/FC降低到500°C显示出更高的CO-SCR活性和耐久性.
单原子结构在400°C下保持稳定超过100小时.
DFT计算显示,Fe位稳定Rh原子,而NO和CO优先吸附于Rh.
Fe促进了氧气的转移,提高了催化性能.

结论:

氧化铁支是有效的固定稳定和活跃的单个Rh原子.
优化降低条件 (500°C) 产生高活性和持久的SAC,用于CO-SCR.
铁和Rh位点之间的协同作用是提高催化性能和稳定性的关键.