在Pd纳米集群和合体功能化的层状酸盐之间进行催化协同作用,以改善酸脱
Esmail Doustkhah1, Muhammed Yusufoğlu2,3,4, Hamza El-Hosainy4,5
1Chemistry Department, Faculty of Engineering and Natural Sciences, Istinye University, Sariyer, Istanbul 34396, Türkiye.
ACS applied materials & interfaces
|November 19, 2024
概括
为 (Pd) 纳米集群合成选择正确的配体是催化过程的关键. 氨基烯基连接剂在酸支上增加了27倍的酸脱活性,而烯基连接剂在酸支上增加了27倍.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术 纳米技术
背景情况:
- 在支上合成和稳定具有最佳催化活性的 (Pd) 纳米集群是具有挑战性的.
- 用连接体进行表面功能化提供了解决方案,但涉及反应产量和催化剂稳定性之间的权衡.
研究的目的:
- 为了研究不同连接体对Pd纳米集群合成,稳定和催化活性的影响.
- 为了比较aminopropyl和thiopropyl功能化酸盐支持Pd纳米集群催化物的性能.
主要方法:
- 用烯和乙醇进行分层酸盐中间层的功能化.
- 在功能化的支上合成和描述Pd纳米集群.
- 对于酸脱的催化试验.
- 密度函数理论 (DFT) 计算来分析Pd-连接体相互作用.
主要成果:
- 氨基基组上的Pd纳米集群在70°C时表现出酸脱的约27倍高的催化活性,与基组上的纳米集群相比.
- 据DFT计算,Pd-N债券较弱,共价较少,而Pd-S债券较强,共价较多.
- 醇功能化的表面导致Pd13集群的严重结构变形,减少了表面积和催化稳定性.
结论:
- 酸盐支持的aminopropyl功能化增强了Pd纳米集团用于甲酸脱的催化活性.
- 虽然 thiopropyl 配体提供更好的 Pd-S 键稳定性,但它们会诱导 Pd 纳米集群的有害结构变化,从而损害整体的催化性能.
相关概念视频
02:50Catalysis
26.7K
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.
26.7K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
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...
3.2K