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Lewis acid/surfactant rare earth trisdodecylsulfate catalysts for biodiesel production from waste cooking oil

Paper ID Volume ID Publish Year Pages File Format Full-Text
40992 45874 2012 6 PDF Available
Title
Lewis acid/surfactant rare earth trisdodecylsulfate catalysts for biodiesel production from waste cooking oil
Abstract

This work reports the synthesis, characterization and application of rare earth (La, Ce, Sm and Gd) trisdodecylsulfate materials as Lewis acid-surfactant-combined catalysts for the production of biodiesel from waste cooking soybean oil. All the solid materials showed a bilayer lamellar arrangement with the dodecylsulfate molecules in a head to head, tail to tail packing. The reaction between commercial feedstocks (soybean oil and oleic acid) with ethanol was used separately to study La, Ce, Sm and Gd catalyst activities for transesterification (conversions of 73, 92, 53 and 73%) and esterification (conversions of 87, 80, 75 and 85%) after 1 h, respectively. Among them, cerium(III) trisdodecylsulfate showed the highest catalytic activity (TOF = 29.5 mol h−1 molcat−1) for transesterification, while lanthanum(III) and gadolinium(III) trisdodecylsulfates were the most active for esterification (TOF = 28.7 mol h−1 molcat−1). The application of the studied catalysts for the simultaneous transesterification and esterification reaction of waste cooking oil, containing 8.8 wt.% of free fatty acids (FFAs), with ethanol showed conversions of 76 (3.3 wt.% of FFAs), 79 (5.3 wt.% of FFAs), 81 (2.5 wt.% of FFAs) and 86% (0.0 wt.% of FFAs) after 1 h for La, Ce, Sm and Gd catalysts, respectively. Thus, gadolinium(III) trisdodecylsulfate was the best material for the conversion of waste feedstock to produce biodiesel. However, cerium(III) trisdodecylsulfate was less susceptible to deactivation, exhibiting conversion values of 92, 81 and 77% for the 1st, 2nd and 3rd reaction cycles. The catalysts were characterized by elemental analysis, X-ray powder diffraction (XRD), 1H NMR, thermal analysis (TG/DTG/DTA) and FTIR measurements.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (73 K)Download as PowerPoint slideHighlights► Synthesis of rare earth trisdodecylsulfate Lewis acid-surfactant-combined catalysts. ► Production of biodiesel from waste cooking oil. ► Cerium(III) catalyst showed the highest activity for transesterification. ► Lanthanum(III) and gadolinium(III) materials were the most active for esterification. ► Gadolinium(III) catalyst was the best material for the conversion of waste feedstock.

Keywords
Rare earth trisdodecylsulfate; Lewis acid-surfactant-combined catalyst; Transesterification; Esterification; Biodiesel
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Lewis acid/surfactant rare earth trisdodecylsulfate catalysts for biodiesel production from waste cooking oil
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 423–424, 7 May 2012, Pages 1–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us