Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 16, Pages 7438-7443Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.02.031
Keywords
free fatty acid removal; esterification; zeolite; waste frying oil; acidity
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The removal of free fatty acid (FFA) in waste frying oil by esterification with methanol was conducted using various zeolite catalysts. The ZSM-5 (MFI), mordenite (MOR), faujasite (FAU), beta (BEA) zeolites, and silicalite were employed with different Si/Al molar ratio in the reaction. The effects of acidic properties and pore structure of the zeolite catalysts were discussed relating to the conversion of the FFA. The MFI zeolite induced an improvement of the removal efficiency of FFA by cracking to the FFA in its pore structure due to its narrow pore mouth. The catalytic activity for FFA removal was lowered with decreasing of acid strength of the zeolites. The strong acid sites of zeolites induced the high conversion of FFA comparatively. The acid strength and pore structure of acidic zeolites affected the catalytic activity in FFA removal. (C) 2008 Elsevier Ltd. All rights reserved.
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