探索Pt与基框架之间的接口转移及其对同位素催化交换的促进作用
Hongbing Wang1, Yifei Yang1, Yida Zhou2
1Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, China.
ACS applied materials & interfaces
|June 5, 2024
概括
澄清了在非可还原基上的界面气转移. 氧化增强了H-D同位素交换的10倍,揭示了一种涉及缺陷西兰醇和静电相互作用的机制.
科学领域:
- 不同质的催化剂.
- 表面科学是一门科学.
- 材料化学 材料化学
背景情况:
- 介面转移在异质催化中至关重要,特别是在金属纳米粒子和催化剂支之间.
- 虽然建立在可减少的支上,但在像石这样的不可减少的支上转移的机制仍在争论中.
研究的目的:
- 为了研究 (Pt) 集群和多孔支之间接口转移的性质.
- 阐明这种转移对H2-HDO同位素催化交换的促销效应.
- 了解二氧化框架结构 (地质与无形) 在促进转移中的作用.
主要方法:
- 在各种多孔的二氧化材料上合成高度分散的Pt集群 (地质和无形框架).
- H2-HDO同位素交换反应以量化催化活性.
- 现场光谱技术 (例如,FTIR,拉曼) 来探测表面物种和相互作用.
- 密度函数理论 (DFT) 计算用于研究反应路径和能量障碍.
主要成果:
- 与无形二氧化相比,地质二氧化框架显著增强了Pt集群和支之间的交界双向迁移.
- 与无形对应物 (例如,Pt/SBA-15) 相比,氧化的H2-HDO同位素交换率增加了10倍.
- 石框架内的缺陷醇通过键作为HDO/H2O的结合点,启动交换机制.
- 提出了一种详细的机制,涉及静电吸引,D从HDO杂到Pt,H从Pt溢出到吸附水中,其能量屏障为0.43 eV.
结论:
- 在二氧化支上形成地质结构是促进界面转移的关键.
- 缺陷的西拉诺和氧化上的静电相互作用促进了高效的H-D同位素交换.
- 这些发现为金属-相互作用提供了关键的见解,并为参与反应的催化剂设计提供了指导.
更多相关视频
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
12.8K
11:02Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica
Published on: July 9, 2015
10.1K
相关概念视频
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.0K
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...
12.0K
02:50Catalysis
26.9K
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.
26.9K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
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.
7.7K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
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...
3.3K