{"title":"Comparative Study of Catalytic Performance of Post Treated H-BEA Zeolites for n-Hexyl Levulinate Synthesis from Renewable Feedstock","authors":"Ayushikumari R. Patel, Aayushi Lodhi, Hemant Parmar, Ajay Dalai, Kalpana Maheria","doi":"10.1007/s10562-024-04903-8","DOIUrl":null,"url":null,"abstract":"<div><p>In the present study, zeolite H-BEA catalyst has been modified by controlled desilication post modification route using first with cationic surfactant, (6-Bromohexyl)trimethylammonium Bromide (6-Br-TMA) designated as MBB catalyst and then the other with 6-Br-TMA and yeast, designated as MBBY catalyst. These newly synthesized catalytic materials have been characterized by several techniques such as, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction, scanning electron microscopy, solid state NMR (<sup>29</sup>Si, <sup>27</sup>Al, <sup>1</sup>H) N<sub>2</sub> sorption isotherm analysis, thermogravimetric analysis, ammonia temperature program desorption (NH<sub>3</sub>-TPD) analysis, etc. These mesozeolites were found to exhibit enhanced physicochemical (BET surface area, surface acidity, pore volume, mesoporosity, etc.) characteristics as compared to their parent zeolite H-BEA. Catalytic assessement studies of the synthesized zeolites has been demonstrated via conducting experiments involving esterification of levulinic acid (LA) and <i>n</i>-hexanol. Parametric studies has been undertaken in order to get maximum LA conversion by varying several reaction parameters such as molar ratio (acid to <i>n</i>-hexanol), catalyst concentration, reaction time, etc. Further catalysts’ reusability studies has been carried out to assess their potential for reusability. The results indicated better catalytic performance of the zeolite H-BEA which is modified with the use of yeast (MBBY) as compared to microporous zeolite H-BEA and MBB catalyst which may be due to its enhanced surface area and surface acidity.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2025-01-03","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/s10562-024-04903-8","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
In the present study, zeolite H-BEA catalyst has been modified by controlled desilication post modification route using first with cationic surfactant, (6-Bromohexyl)trimethylammonium Bromide (6-Br-TMA) designated as MBB catalyst and then the other with 6-Br-TMA and yeast, designated as MBBY catalyst. These newly synthesized catalytic materials have been characterized by several techniques such as, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction, scanning electron microscopy, solid state NMR (29Si, 27Al, 1H) N2 sorption isotherm analysis, thermogravimetric analysis, ammonia temperature program desorption (NH3-TPD) analysis, etc. These mesozeolites were found to exhibit enhanced physicochemical (BET surface area, surface acidity, pore volume, mesoporosity, etc.) characteristics as compared to their parent zeolite H-BEA. Catalytic assessement studies of the synthesized zeolites has been demonstrated via conducting experiments involving esterification of levulinic acid (LA) and n-hexanol. Parametric studies has been undertaken in order to get maximum LA conversion by varying several reaction parameters such as molar ratio (acid to n-hexanol), catalyst concentration, reaction time, etc. Further catalysts’ reusability studies has been carried out to assess their potential for reusability. The results indicated better catalytic performance of the zeolite H-BEA which is modified with the use of yeast (MBBY) as compared to microporous zeolite H-BEA and MBB catalyst which may be due to its enhanced surface area and surface acidity.
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.
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