{"title":"Skeletal isomerization of oleic acid on silica-coated ZSM-22","authors":"Xinyu Wei, Mingming Peng, Toshiya Tsunakawa, Yuyang Jia, Kenji Kamiya, Eika W. Qian","doi":"10.1016/j.apcata.2025.120182","DOIUrl":null,"url":null,"abstract":"<div><div>To enhance the skeletal isomerization activity of the catalyst and increase the yield of branch chain unsaturated fatty acids (BUFAs) from oleic acid, a series of silica-coated ZSM-22 with different silica content were developed by crystal overgrowth. The patterns of XRD exposed that zeolitic framework structures of ZSM-22 were kept after silica coating. 2,6-lutidine adsorption FT-IR spectroscopy revealed that the acid sites on the external surface of silica-coated ZSM-22 samples were partially covered by silica layers. Regarding the influence of silica coating amount, 20Si·HZ-22(60) with 20 % silica content had a high BUFAs yield of above 80 % and more efficiently inhibited the formation of dimer acids compared to parent ZSM-22(60) without silica coating. Additionally, the suppression of dimer acid formation makes the catalyst less prone to deactivation.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"696 ","pages":"Article 120182"},"PeriodicalIF":4.8000,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Catalysis A: General","FirstCategoryId":"1","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0926860X25000833","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
To enhance the skeletal isomerization activity of the catalyst and increase the yield of branch chain unsaturated fatty acids (BUFAs) from oleic acid, a series of silica-coated ZSM-22 with different silica content were developed by crystal overgrowth. The patterns of XRD exposed that zeolitic framework structures of ZSM-22 were kept after silica coating. 2,6-lutidine adsorption FT-IR spectroscopy revealed that the acid sites on the external surface of silica-coated ZSM-22 samples were partially covered by silica layers. Regarding the influence of silica coating amount, 20Si·HZ-22(60) with 20 % silica content had a high BUFAs yield of above 80 % and more efficiently inhibited the formation of dimer acids compared to parent ZSM-22(60) without silica coating. Additionally, the suppression of dimer acid formation makes the catalyst less prone to deactivation.
期刊介绍：
Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications.
Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.
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