{"title":"Enhancing gluconic acid selectivity in catalytic oxidation: the synergetic effect of glucose-fructose mixtures and kinetic insights","authors":"","doi":"10.1007/s43153-024-00435-1","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>Gluconic acid is a chemical raw material widely used in the food and chemical industries that can be produced by oxidizing glucose and available sugar-rich substrates such as biomass. The abundance of glucose and fructose in industrial waste from lignocellulose and inverted sugar makes them a promising sustainable feedstock. In this work, the catalytic conversion of a glucose and fructose mixture into gluconic acid in an alkaline medium using Pd (4%)—Pt (1%)—Bi (5%)/C catalysts under flowing air was studied. Previously, the traditional chemical conversion of glucose into gluconic acid produced large amounts of by-products. In this work, we combined glucose and fructose to investigate the latter's influence on conversion. The selectivity to gluconic acid was significantly improved by fructose, indicating a new approach for using biomass and by-products such as glucose and fructose syrup. The first step was to conduct a series of experiments at different temperatures and pH levels. The second step was to experiment with adding fructose under optimal conditions. The gluconic acid was about 90%. The yield was approximately 79% at 55 °C and pH 9.5 using the same method with only glucose. Combining experimental data, we propose a kinetic model with a TOF (turnover frequency) between 1.0 and 5.5.</p>","PeriodicalId":9194,"journal":{"name":"Brazilian Journal of Chemical Engineering","volume":"16 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Brazilian Journal of Chemical Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s43153-024-00435-1","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Gluconic acid is a chemical raw material widely used in the food and chemical industries that can be produced by oxidizing glucose and available sugar-rich substrates such as biomass. The abundance of glucose and fructose in industrial waste from lignocellulose and inverted sugar makes them a promising sustainable feedstock. In this work, the catalytic conversion of a glucose and fructose mixture into gluconic acid in an alkaline medium using Pd (4%)—Pt (1%)—Bi (5%)/C catalysts under flowing air was studied. Previously, the traditional chemical conversion of glucose into gluconic acid produced large amounts of by-products. In this work, we combined glucose and fructose to investigate the latter's influence on conversion. The selectivity to gluconic acid was significantly improved by fructose, indicating a new approach for using biomass and by-products such as glucose and fructose syrup. The first step was to conduct a series of experiments at different temperatures and pH levels. The second step was to experiment with adding fructose under optimal conditions. The gluconic acid was about 90%. The yield was approximately 79% at 55 °C and pH 9.5 using the same method with only glucose. Combining experimental data, we propose a kinetic model with a TOF (turnover frequency) between 1.0 and 5.5.
期刊介绍：
The Brazilian Journal of Chemical Engineering is a quarterly publication of the Associação Brasileira de Engenharia Química (Brazilian Society of Chemical Engineering - ABEQ) aiming at publishing papers reporting on basic and applied research and innovation in the field of chemical engineering and related areas.
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