在甲-乙烯凝结反应中使用疏水催化剂
Jianxiang Li1, Qiang Zhang1, Chunyi Li1
1State Key Laboratory of Heavy Oil Processing, School of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China.
疏水性气凝载体增强p-toluene硫酸催化剂的甲-乙烯凝结. 这提高了活性位点的稳定性和对1,3-二和1,3-二醇合成的选择性.
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:
- 甲-乙烯凝结反应对于合成有价值的化学物质至关重要.
- 开发高效和稳定的催化剂对于优化这种反应至关重要.
- 疏水材料在催化剂设计和性能方面具有潜在的优势.
研究的目的:
- 在气气凝 (AGL) 上支持的p-toluene sulfonic acid (p-TSA) 催化剂的合成.
- 为了研究催化剂对甲-乙烯凝结反应的疏水性的影响.
- 与传统支相比,评估AGL支持的催化剂的性能.
主要方法:
- 使用水接触角度,XRD,N2吸附/脱附,IR和热重力学分析进行催化剂的表征.
- 基本分析以评估主动站点负载和稳定性.
- 气相色谱或类似的技术来确定产品的选择性.
主要成果:
- AGL成功地支持p-TSA,为催化剂传递强烈的疏水性.
- 支持AGL的催化剂表现出更多的活性位点和减少的活性位点损失 (15.03%对比25.82%).
- 对1,3-二氧化 (1,3-DX) 的选择性从16.2%增加到33.3%.
- 通过直接合成1,3-propanediol (1,3-PDO),使用酸作为溶剂,可达到高达80.5%的选择性.
结论:
- 疏水性气凝是p-TSA催化剂的有效载体,提高了反应性能.
- 改善的催化剂稳定性和选择性为化学合成提供了一个有前途的途径.
- 用乙酸作为溶剂取代水,可以直接生产1,3-二醇.
更多相关视频
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
07:36Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
相关概念视频
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
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...
Acid-Catalyzed Dehydration of Alcohols to Alkenes
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
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...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
