Chemical Engineering / Kimya Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/14

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Institution Author: search.filters.institutionAuthor.Umdu, Emin SelahattinSubject: search.filters.subject.Alumina

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  • Article
    Citation - WoS: 36
    Citation - Scopus: 39
    Transesterification of Sunflower Oil on Single Step Sol-Gel Made Al2o3 Supported Cao Catalysts: Effect of Basic Strength and Basicity on Turnover Frequency
    (Elsevier Ltd., 2012) Umdu, Emin Selahattin; Şeker, Erol
    The activities of single step sol-gel made calcium oxide on alumina catalysts were studied as a function of CaO loading, methanol/oil molar ratio and the amount of the catalyst in the transesterification of sunflower oil at 50°C. Also, the turnover frequency (TOF) of the catalysts was calculated to better understand the relationship between the basicity/basic strength and the catalytic activity. From volcano curve (TOF vs. basic strength), it was found that under 50°C and methanol/oil molar ratio of 9, 60% CaO/Al 2O 3 had the highest turnover frequency, 0.028s -1, whereas 85% CaO/Al 2O 3 showed the highest biodiesel yield, ∼96.6%, but TOF obtained on it was 0.012s -1. It seemed that 60% CaO catalyst had the proper basic strength to obtain the highest TOF. © 2011 Elsevier Ltd.