{"title":"Liquid-Phase Oxidation of Cyclohexane by Cr/Ti-MWW Zeolite Catalysts for KA Oil Synthesis","authors":"Ximin Wang, Guiying Wu, Siyi Wang, Zhongman Liang, Shengdong Zhu, Fang Jin","doi":"10.1007/s10562-025-05122-5","DOIUrl":null,"url":null,"abstract":"<p>The mixed systems of cyclohexanol and cyclohexanone (commonly known as KA oil) are key precursors for the synthesis of caprolactam and adipic acid.The atom planting (AP) and impregnation methods has been used to introduce Ti and Cr sequentially into deboronated MWW zeolite catalysts for cyclohexane liquid-phase oxidation, and high KA oil selectivity was obtained. The highly dispersed Cr species as the active site for cyclohexane oxidation were made by introduction of tetra-coordinated Ti species into the zeolite skeleton through the AP method. The catalysts were characterized using XRD, FT-IR, UV-Vis, contact angle and other methods. The results show that the hydrophilicity of the zeolites, the polarity of the solvents, and the metal loading have significant effects on the cyclohexane conversion and the selectivity of KA oil. Through continuous optimization of the reaction conditions, cyclohexane conversion and KA oil selectivity of 25.8% and 99.4% were obtained, respectively.</p>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 8","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysis Letters","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10562-025-05122-5","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The mixed systems of cyclohexanol and cyclohexanone (commonly known as KA oil) are key precursors for the synthesis of caprolactam and adipic acid.The atom planting (AP) and impregnation methods has been used to introduce Ti and Cr sequentially into deboronated MWW zeolite catalysts for cyclohexane liquid-phase oxidation, and high KA oil selectivity was obtained. The highly dispersed Cr species as the active site for cyclohexane oxidation were made by introduction of tetra-coordinated Ti species into the zeolite skeleton through the AP method. The catalysts were characterized using XRD, FT-IR, UV-Vis, contact angle and other methods. The results show that the hydrophilicity of the zeolites, the polarity of the solvents, and the metal loading have significant effects on the cyclohexane conversion and the selectivity of KA oil. Through continuous optimization of the reaction conditions, cyclohexane conversion and KA oil selectivity of 25.8% and 99.4% were obtained, respectively.
期刊介绍:
Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.