相关实验视频

Updated: Jun 21, 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

[Ce³⁺-O_V-Ce⁴⁺] 通过CO₂化生产甲醇的分布在表面的Cu-Zn-Ce催化剂

Xuguang Wang¹, Yaxin Liu¹, Zihao Wang¹

¹Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, Carbon Neutral Joint Laboratory of East China University of Science and Technology-Shenergy Co., Ltd. East China University of Science and Technology, Shanghai 200237, China.

Langmuir : the ACS journal of surfaces and colloids

|July 9, 2024

概括

这项研究设计了一种新的Cu-Zn-Ce催化剂,表面具有[Ce³⁺-O_V-Ce⁴⁺]物种. 这种独特的结构增强了二氧化碳吸附,将甲醇的选择性提高了10%.

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
表面化学表面化学

背景情况:

金属支相互作用对于基于铜的催化剂至关重要.
在催化剂设计中,支金属的内在性质的作用往往被忽视.

研究的目的:

设计一种新的Cu-Zn-Ce催化剂,采用特定的表面氧空置物种.
研究对氧空位形成的影响及其对催化性能的影响.

主要方法:

催化剂合成的Sol-gel方法.
电子偏磁共振 (EPR) 和X射线光电子光谱 (XPS) 用于描述氧空位和状态.
感应合等离子体质谱 (ICP-MS),SEM映射和温度编程的二氧化碳 (CO2-TPD) 脱吸,用于表面分析和吸附研究.
密度函数理论 (DFT) 计算以了解吸附机制.

主要成果:

通过sol-gel方法成功合成了一种具有表面[Ce³⁺-O_{V-Ce⁴⁺]物种的板 Cu-Zn-Ce催化剂.}
本质上诱导了催化剂表面形成[Ce³⁺-O_{V-Ce⁴⁺,由EPR,XPS,ICP-MS和SEM映射证实.}
[Ce³⁺-O_V-Ce⁴⁺]位点显著增强了二氧化碳吸附,这是CO2-TPD和DFT计算所证明的.
与通过共降准备的催化剂相比,甲醇的选择性增加了10%.

结论:

由诱导的表面[Ce³⁺-O_V-Ce⁴⁺]物种的存在是Cu-Zn-Ce催化剂中改善CO2吸附和甲醇选择性的关键.
量身定制支金属的特性,特别是在创造氧空缺中的作用,为提高催化剂性能提供了一个有希望的策略.
索尔凝方法为设计具有针对CO2转换的表面功能的催化剂提供了有效的途径.

更多相关视频

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

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

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.

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.