构建以酸为基的Rh-O-Zn) x网站
Haocheng Hu1,2, Wenhao Cui3, Mingbin Gao4
1National Engineering Research Center of Lower-Carbon Catalysis Technology, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
通过将Rh物种与Zn-O位点结合起来,Rh催化剂具有较好的稳定性. 这种设计可以防止Rh出和聚合,从而产生高度活跃和耐用的催化剂.
科学领域:
- 不同质的催化
- 有机金属化学
- 材料科学
背景情况:
- 基于Rh的凝化催化剂对氨酸的化有希望.
- 挑战包括Rh和聚合,降低催化剂的稳定性和活性.
- 需要强大的催化剂设计来克服这些局限性.
研究的目的:
- 设计和合成稳定和活跃的化物封闭的Rh催化剂,用于气相乙烯的化.
- 调查Zn-O物种在定Rh和防止其失活中的作用.
- 阐明这些双金属位点上的乙烯水合基的机制.
主要方法:
- 将Rh和Zn物种联合封装成Silicalite-1焦化物.
- 在水酸化过程中在现场构建Rhδ+-(O-Zn) x位点.
- 使用现场里埃变换红外光谱 (FTIR) 和动力分析进行表征.
主要成果:
- 最佳的0.2Rh@Zn3-S-1催化剂在363K时实现了148h-1的转频率,并且在40小时内没有停用.
- 石框架固的Rhδ+-(O-Zn) x位点表现出显著的活性和稳定性,防止Rh聚合.
- 在现场FTIR显示,作为限制速率的步骤,促使Rh再分散和acyl物种的化.
结论:
- 焦石固的Rhδ+-O-Zn) x场所为设计稳定高效的水合成型催化剂提供了一种新策略.
- Zn-O 种类作为无机配体,有效地定 Rh 并增强催化剂的耐用性.
- 这项研究提供了对双金属位点的化机制的见解,确定了关键中间体和速度限制的步骤.
更多相关视频
08:25Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
Published on: January 17, 2020
04:51Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
相关概念视频
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 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: 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...
Ziegler–Natta Chain-Growth Polymerization: Overview
Carboxylic Acids to Methylesters: Alkylation using Diazomethane
Electrophilic Addition to Alkynes: Hydrohalogenation
