在单原子催化剂的乙烯化和毒性最小化影响的融合活性站点进化
V Giulimondi1, M Vanni1, S Damir1
1Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich 8093, Switzerland.
活性炭上的单个原子为乙烯化物合成提供了稳定,无的途径. 不同的前体最初会影响活性,但催化剂汇聚到稳定,有效的物种.
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
- 绿色化学 绿色化学
背景情况:
- 无合成乙烯化物 (VCM) 对于可持续的化学生产至关重要.
- 单原子催化剂 (Pt SAC) 是新兴的黄金替代品,用于VCM合成.
- 目前的Pt SAC合成通常使用酸,促使对各种前体的探索.
研究的目的:
- 研究不同前体对用于VCM合成的Pt SACs的影响.
- 了解各种Pt前体的结构-活性关系和毒性影响.
- 为VCM生产开发一个安全的设计催化剂.
主要方法:
- 在活性炭上使用各种 Pt2+ 和 Pt4+ 复合体合成 Pt SAC.
- 使用X射线吸收光谱学 (XAS) 进行表征.
- 活动测试和使用密度函数理论 (DFT) 的计算研究.
主要成果:
- 在沉积后,Pt4+物种减少到Pt2+.
- 由于更好的HCl结合,四胺衍生的Pt SACs显示出更高的初始活性.
- 随着时间的推移,催化剂活性趋同,在150小时内实现稳定的VCM产量.
- 操作XAS和DFT揭示了反应诱导的稳定Pt-Clx物种的形成.
结论:
- 前体的选择影响了最初的Pt SAC活动,但动态的重组导致了趋同的,稳定的活跃地点.
- 灵活的前体选择是可能的,使催化剂设计中的毒性最小化.
- 这项工作推进了VCM合成的安全设计催化剂,强调早期毒性评估.
更多相关视频
10:19Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
07:20Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
相关概念视频
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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.
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
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
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...
Catalysis
Radical Reactivity: Concentration Effects
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
