Oxidative esterification of 1, 2-propanediol to methyl lactate over Au/CuxAlOy catalysts in methanol without the presence of a base

IF 1.7 4区化学 Q4 CHEMISTRY, PHYSICAL

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-11-18 DOI:10.1007/s11144-024-02772-1

Weiguo Fang, Xiaohu Xie, Guixian Li, Yingying Fan, Junying Tian, Dongqiang Zhang

{"title":"Oxidative esterification of 1, 2-propanediol to methyl lactate over Au/CuxAlOy catalysts in methanol without the presence of a base","authors":"Weiguo Fang, Xiaohu Xie, Guixian Li, Yingying Fan, Junying Tian, Dongqiang Zhang","doi":"10.1007/s11144-024-02772-1","DOIUrl":null,"url":null,"abstract":"<div><p>A series of Au catalysts supported on different CuAl composite oxide supports were designed for the oxidative esterification of 1,2-propanediol to methyl lactate in an alkali-free methanol system. A conversion of 52.8% and a methyl lactate selectivity of 67.0% were obtained over the optimized Au/Cu<sub>1.5</sub>AlO<sub>3</sub> catalyst under the conditions of 140 °C and 1.0 MPa O<sub>2</sub>. The Au in the catalyst was revealed to be pivotal, providing the essential active sites necessary for the oxidative esterification of 1,2-propanediol. Moreover, the inclusion of Cu in the CuAl composite oxide support was discovered to markedly enhance the catalytic performance of the Au catalysts. The synergistic interaction between Au and Cu is posited to alter the electronic and geometric properties of the gold sites, thereby enhancing the catalyst's ability to oxidize the primary hydroxyl group of 1,2-propanediol. This strategic modification of the Au sites by Cu is instrumental in improving the selectivity for methyl lactate during the oxidative esterification process.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"947 - 965"},"PeriodicalIF":1.7000,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reaction Kinetics, Mechanisms and Catalysis","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s11144-024-02772-1","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

A series of Au catalysts supported on different CuAl composite oxide supports were designed for the oxidative esterification of 1,2-propanediol to methyl lactate in an alkali-free methanol system. A conversion of 52.8% and a methyl lactate selectivity of 67.0% were obtained over the optimized Au/Cu_1.5AlO₃ catalyst under the conditions of 140 °C and 1.0 MPa O₂. The Au in the catalyst was revealed to be pivotal, providing the essential active sites necessary for the oxidative esterification of 1,2-propanediol. Moreover, the inclusion of Cu in the CuAl composite oxide support was discovered to markedly enhance the catalytic performance of the Au catalysts. The synergistic interaction between Au and Cu is posited to alter the electronic and geometric properties of the gold sites, thereby enhancing the catalyst's ability to oxidize the primary hydroxyl group of 1,2-propanediol. This strategic modification of the Au sites by Cu is instrumental in improving the selectivity for methyl lactate during the oxidative esterification process.

Graphical Abstract

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Reaction Kinetics, Mechanisms and Catalysis CHEMISTRY, PHYSICAL-

CiteScore

3.30

自引率

5.60%

发文量

201

审稿时长

2.8 months

期刊介绍： Reaction Kinetics, Mechanisms and Catalysis is a medium for original contributions in the following fields: -kinetics of homogeneous reactions in gas, liquid and solid phase; -Homogeneous catalysis; -Heterogeneous catalysis; -Adsorption in heterogeneous catalysis; -Transport processes related to reaction kinetics and catalysis; -Preparation and study of catalysts; -Reactors and apparatus. Reaction Kinetics, Mechanisms and Catalysis was formerly published under the title Reaction Kinetics and Catalysis Letters.