相关实验视频

Updated: Jun 20, 2025

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

Published on: February 7, 2017

在水相低温热催化中,MnO₂的晶体相驱动性能:Mn³⁺与表面晶格氧气之间的协同相互作用

Haopeng Luo¹, Heng Du¹, Mingwei Jiang¹

¹Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Journal of hazardous materials

|July 18, 2024

概括

不同的二氧化 (MnO2) 水晶相在废水处理的催化氧化中表现出不同的有效性. 兰巴达相MnO2表现出最高的活动,由氧空缺和氧化还原特性驱动.

科学领域:

材料科学材料科学材料科学
环境化学环境化学
催化剂是一种催化剂.

背景情况:

催化湿气氧化 (CWAO) 面临着高压和高温的挑战.
聚晶二氧化 (MnO2) 是催化氧化的一个有前途的材料.
在水相反应中,MnO2晶相的结构-活性关系尚不清楚.

研究的目的:

为了合成各种MnO2晶相 (α,β,δ,γ,ε,λ).
评估它们在温和条件下对有机污染物降解的催化氧化效率.
阐明MnO2晶体结构与催化活性之间的关系.

主要方法:

多种MnO2晶相的合成.
在低温下评估催化氧化效率.
氧空位丰度和氧化还原活性的分析.
活动物种的识别 (Mn3+,O2−).

主要成果:

λ-MnO2表现出最高的催化活性,其次是 δ, γ, α, ε 和 β-MnO2.
催化活性与氧空位含量和氧化还原特性相关.
表面晶格氧产生活性物种,如Mn3+和超氧化基 (•O2−).

结论:

晶相显著影响MnO2的氧空位含量,氧还原活性和催化性能.
λ-MnO2是CWAO中有机污染物降解的高效催化剂.
结果为设计适合废水处理的MnO2催化剂提供了洞察力.

关键词:

结晶阶段水晶阶段格子氧气激活激活方式低温热催化剂的热催化方法 (3+) 是一种有氧化物.MnO ((2)) 是一种有氧化物.

更多相关视频

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

Writing and Low-Temperature Characterization of Oxide Nanostructures

Writing and Low-Temperature Characterization of Oxide Nanostructures

Published on: July 18, 2014

相关概念视频

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.

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

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.

Cycloaddition Reactions: MO Requirements for Thermal Activation

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.