支持的Ru催化剂在选择性CO甲化中的高选择性水产生了区别
Ali M Abdel-Mageed1, Stephan Eckle2, R Jürgen Behm1
1†Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany.
Journal of the American Chemical Society
|June 27, 2015
概括
将水添加到料气中显著提高了支持的Ru催化剂中的CO甲化选择性. 这一过程还减少了Ru粒子的大小,提高了从燃料气体中去除二氧化碳的催化剂性能.
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:
- 甲化对于从二氧化碳丰富的 (H2) 燃料气体中去除一氧化碳 (CO) 至关重要.
- 在实际应用中,催化剂选择性是有效的CO甲化关键.
- 支持的 (Ru) 催化剂在此反应中被研究了它们的性能.
研究的目的:
- 调查料气中的水含量对支持的 Ru 催化剂对 CO 甲化的选择性的影响.
- 了解水度,Ru粒子大小和催化性能之间的关系.
- 探索燃料气体净化在实际应用中的机械学影响.
主要方法:
- 操作扩展X射线吸收细结构 (EXAFS) 测量以分析Ru粒子大小变化.
- 红外 (IR) 光谱学以获得机械洞察力.
- 在料气中的水含量 (高达30%) 不同的情况下,测试支持Ru催化剂.
主要成果:
- 增加料气中的水含量显著提高了支持的Ru催化剂的二氧化碳甲化选择性.
- 操作EXAFS显示,随着水含量增加,Ru粒子大小逐渐减少.
- 红外光谱数据为观察到的效应提供了进一步的机制理解.
结论:
- 料气中的水是改善支持Ru催化剂的CO甲化选择性的关键因素.
- 随着水含量增加而观察到的Ru颗粒大小的减少影响了催化性能.
- 这些发现对优化二氧化碳去除和燃料气体净化的甲化过程有直接影响.
相关概念视频
Heterogeneous Catalysis
112
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
112
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.0K
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...
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...
4.0K
Catalysis
32.4K
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.
32.4K
Olefin Metathesis Polymerization: Overview
2.8K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
2.8K
Reduction of Alkenes: Catalytic Hydrogenation
15.0K
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...
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...
15.0K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.6K
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.
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.
9.6K


