在SiO2-涂层核心外NiFe2中的原子迁移的直接现场TEM可视化在化学循环CO2转换过程中再氧催化剂转化
Da Song1,2, Yang Li2,3, Yuchao Zhou2,4
1School of Energy Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Small (Weinheim an der Bergstrasse, Germany)
|May 30, 2025
概括
用SiO2外封装氧化还原催化剂,可以防止化学循环过程中金属颗粒聚合,提高催化剂的稳定性. 了解支相互作用是设计工业应用的耐用催化剂的关键.
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:
- 化学循环使用氧化还原催化剂进行燃料转化,但面临着烧结和失活等挑战.
- 封装策略有望延长催化剂寿命,但相互作用机制尚不清楚.
研究的目的:
- 在循环条件下研究氧化还原催化剂的结构演变和失活路径.
- 阐明SiO2外在增强催化剂稳定性和性能方面的作用.
主要方法:
- 在现场传输电子显微镜 (TEM) 观察氧化还原循环期间的结构变化.
- 密度函数理论 (DFT) 模拟以了解尺寸依赖的纳米粒子活动和支持相互作用.
主要成果:
- 二氧化外通过减少过程中的封闭效应抑制奥斯瓦尔德成熟和金属颗粒聚合.
- DFT模拟显示SiO2支持影响氧化过程中的Ni纳米粒子迁移.
- 催化剂-支持分离成为一个关键的长期停用因素.
结论:
- 具有SiO2封装的等级氧化还原催化剂表现出更好的热和氧化还原稳定性.
- 现场观测为设计化学循环应用的强大的催化剂提供了关键的见解.
相关概念视频
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.9K
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.
10.9K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.5K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.5K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
13.2K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
13.2K
Chemiosmosis
102.9K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
102.9K
Couette Flow
466
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
466
Redox Equilibria: Overview
1.2K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.2K


