脱化2-thiolimidazole作为选择性乙烯化的无金属电催化剂
Lei Zhang1,2, Rui Bai1, Jin Lin1
1State Key Laboratory of Solidification Processing and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, P. R. China.
Nature chemistry
|April 19, 2024
概括
没有金属的2-thiolimidazole有效地催化了乙烯化到乙烯的化. 这种催化剂的性能与金属基材料相比具有竞争力,突出显示了可持续电催化剂的潜力.
科学领域:
- 电触媒溶解是一种电触媒.
- 材料科学 材料科学 材料科学
- 可持续化学 可持续化学
背景情况:
- 无金属催化剂被寻求作为传统金属基电催化剂的替代品.
- 现有的无金属催化剂往往缺乏金属基催化剂的高活性.
- 乙到乙烯的选择性电催化化是一种关键的化学转化.
研究的目的:
- 开发一种高效的无金属催化剂,用于选择性乙烯化.
- 为了研究在乙电化中无金属催化机制.
- 探索用于电催化剂的伊米达衍生物中的结构-活性关系.
主要方法:
- 使用2-thiolimidazole作为催化剂对乙的电催化化.
- 运行光谱研究以了解性条件下的活性物种.
- 系统地改变伊米达衍生物,以将电子结构与催化性能相关联.
主要成果:
- 在性条件下,2-thiolimidazole 形成了一个无质子化的 dianion 活性物种.
- 在pyridinic N位点上增强的负电荷通过σ-配置促进了乙烯吸附.
- 获得了具有竞争力的乙烯部分电流密度和高法拉达效率,与Cu和Pd催化剂相美.
结论:
- 脱化2-thiolimidazole是一种高效的无金属电催化剂,用于乙烯化.
- 在pyridinic N位点电荷和乙烯生产之间观察到火山关系.
- 这项工作证明了可调节的无金属分子催化剂在电催化中的巨大潜力.
相关概念视频
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
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
02:13Reduction 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
02:42Acidity of 1-Alkynes
9.7K
The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
9.7K
01:24Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones
4.1K
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
4.1K
02:33Preparation and Reactions of Thiols
6.2K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.2K