聚烯塑料上循环的异质催化策略:在温和条件下进行协同反应剂辅助和直接转化
Haokun Wang1, Sijie Huang1, Shik Chi Edman Tsang1
1Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, UK. edman.tsang@chem.ox.ac.uk.
Chemical communications (Cambridge, England)
|December 23, 2024
概括
催化上循环将聚烯 (PO) 塑料转化为有价值的产品,使用和CO2等协同反应剂. 这种可持续的方法为塑料废物管理提供了对传统的能源密集型回收方法的有希望的替代方案.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 大规模的聚烯烯 (PO) 塑料生产和处理造成了重大环境问题.
- 传统的回收方法耗费大量能源,往往效率低下,需要可持续的替代品.
- 在温和条件下的催化上循环为PO塑料转化提供了一个可行的策略.
研究的目的:
- 审查和分类聚烯 (PO) 塑料上循环的最新进展.
- 分析各种协同反应物的作用 (例如,H2,基,基,O2,CO2) 在PO塑料转化中.
- 为了比较协同反应剂辅助的上循环与无协同反应剂的过程.
主要方法:
- 基于共反应剂类型的PO塑料上循环策略的分类.
- 对不同协同反应剂驱动的催化上循环过程进行比较分析.
- 对聚烯的直接,无辅助反应物的上循环方法的审查.
主要成果:
- 同反应剂在PO上循环中显著影响反应机制和产品多样性.
- 在温和条件下的催化上循环可以将PO塑料转化为有价值的化学物质.
- 进步包括改进的催化系统和通过协同反应剂利用的更广泛的产品范围.
结论:
- 协同反应剂介导的催化上循环是可持续的多聚烯 (PO) 塑料管理的关键策略.
- 需要进一步的研究来增强催化稳定性,产品选择性,并解决扩散限制.
- 本综述提供了对有效的PO塑料回收利用的催化化学的见解,指导了未来的研究.
相关概念视频
01:13Olefin Metathesis Polymerization: Overview
2.0K
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...
2.0K
02:50Catalysis
26.6K
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.
26.6K
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
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
7.7K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.7K
00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
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...
1.9K
01:16Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.5K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.5K