室温 乙烯与 (ETP) 协同催化,使用单晶固态分子预催化剂
Kristof M Altus1, Yiping Shi2, Patrick Probst3
1Department of Chemistry, University of York Heslington, York, YO10 5DD, UK.
Angewandte Chemie (International ed. in English)
|January 29, 2025
概括
新的固态分子有机金属催化剂使乙烯能够高效地进行烯过程. 这种新的晶体方法在环境条件下运行,为烯转化提供了一个可持续的替代方案.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 乙烯转化为 (ETP) 过程对于生产来说至关重要,是一种关键的烯原料.
- 现有的ETP技术往往需要高温和高压,从而增加能源消耗和运营成本.
- 为ETP开发高效和可持续的催化系统仍然是化学合成的一个重大挑战.
研究的目的:
- 引入一种新的联催化系统,用于乙烯到过程.
- 在各种条件下研究固态分子有机金属 (SMOM) 晶体预催化剂的性能.
- 评估一个"在晶体"的方法对olefin转换的潜力.
主要方法:
- 在批量和流量反应堆设置中部署SMOM晶体预催化剂.
- 乙烯的催化转化通过序列的乙烯二元化,布丁烯异构化和交叉转基因反应.
- 分析催化性能,包括转换,选择性和随时间的稳定性.
主要成果:
- 在流量条件下实现了55%的流动乙烯转化.
- 证明了92%的初始烯选择性.
- 暴露的催化剂稳定性,具有71%的选择性,在经过7小时的运行后保持不变.
- 在环境温度和低压下有效运行.
结论:
- SMOM晶体预催化剂为乙烯转过程提供了具有竞争力和高效的方法.
- 这种"in crystallo"的催化系统表现出与最先进的异质系统相比具有前途的性能.
- 这项工作为在温和条件下转化烯提供了一个新的,可持续的途径.
相关概念视频
01:13Olefin Metathesis Polymerization: Overview
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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01:17Thermal Electrocyclic Reactions: Stereochemistry
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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02:13Reduction of Alkenes: Catalytic Hydrogenation
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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...
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01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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