{"title":"Enhanced Lewis acidity on modified H-ZSM-5 catalysed 5-hydroxymethylfurfural oxidation in aqueous solvent","authors":"","doi":"10.1016/j.mcat.2024.114610","DOIUrl":null,"url":null,"abstract":"<div><div>The primary focus of the present study is to develop a zeolite-based catalyst that enhances Lewis acidity for catalysing 5-hydroxymethylfurfural (HMF) oxidation. The study modifies the parent H-ZSM-5 (H-Z) via desilication followed by Ru impregnation. The results show that RuZS<sub>90</sub> (Ru impregnated on desilicated H-Z for 90 min) exhibits higher catalytic activity for the HMF oxidation than Ru impregnated on parent H-Z. NH<sub>3</sub>-temperature programmed desorption (TPD) results indicate that RuZS<sub>90</sub> possesses more than 2.6 and 2.3 times higher total acidity than H-Z and RuH-Z, contributing to the higher catalytic activity. A poisoning study with potassium thiocyanate (KSCN), which passivates Lewis acidic sites, suggests that RuZS<sub>90</sub> yields no considerable oxidised furanic products, confirming the crucial role of Lewis acidic sites. The NH<sub>3</sub>-DRIFT study further corroborates that RuZS<sub>90</sub> contains more enhanced Lewis acidic sites than the parent H-Z, playing a vital role in the oxidation of HMF.</div></div>","PeriodicalId":393,"journal":{"name":"Molecular Catalysis","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Molecular Catalysis","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2468823124007922","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The primary focus of the present study is to develop a zeolite-based catalyst that enhances Lewis acidity for catalysing 5-hydroxymethylfurfural (HMF) oxidation. The study modifies the parent H-ZSM-5 (H-Z) via desilication followed by Ru impregnation. The results show that RuZS90 (Ru impregnated on desilicated H-Z for 90 min) exhibits higher catalytic activity for the HMF oxidation than Ru impregnated on parent H-Z. NH3-temperature programmed desorption (TPD) results indicate that RuZS90 possesses more than 2.6 and 2.3 times higher total acidity than H-Z and RuH-Z, contributing to the higher catalytic activity. A poisoning study with potassium thiocyanate (KSCN), which passivates Lewis acidic sites, suggests that RuZS90 yields no considerable oxidised furanic products, confirming the crucial role of Lewis acidic sites. The NH3-DRIFT study further corroborates that RuZS90 contains more enhanced Lewis acidic sites than the parent H-Z, playing a vital role in the oxidation of HMF.
期刊介绍：
Molecular Catalysis publishes full papers that are original, rigorous, and scholarly contributions examining the molecular and atomic aspects of catalytic activation and reaction mechanisms. The fields covered are:
Heterogeneous catalysis including immobilized molecular catalysts
Homogeneous catalysis including organocatalysis, organometallic catalysis and biocatalysis
Photo- and electrochemistry
Theoretical aspects of catalysis analyzed by computational methods
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