Evaluation of the activity and stability of alkali-doped metal oxide catalysts for application to an intensified method of biodiesel production

A series of alkali-doped metal oxide catalysts were prepared and evaluated for activity in the transesterification of rapeseed oil to biodiesel. Of those evaluated, LiNO3/CaO, NaNO3/CaO, KNO3/CaO and LiNO3/MgO exhibited >90% conversion in a standard 3 h test. There was a clear correlation between base strength and activity. These catalysts appeared to be promising candidates to replace conventional homogeneous catalysts for biodiesel production as the reaction times are low enough to be practical in continuous processes and the preparations are neither prohibitively difficult nor costly. However, metal leaching from the catalyst was detected, and this resulted in some homogeneous activity. This would have to be resolved before these catalysts would be viable for large-scale biodiesel production facilities.

[1]  S. Gryglewicz.  Rapeseed oil methyl esters preparation using heterogeneous catalysts , 1999 .

[2]  C. Plank,et al.  Simultaneous determination of glycerol, and mono-, di- and triglycerides in vegetable oil methyl esters by capillary gas chromatography , 1995 .

[3]  N. Clark,et al.  Emissions from nine heavy trucks fueled by diesel and biodiesel blend without engine modification , 2000 .

[4]  G. Vicente,et al.  Kinetics of Sunflower Oil Methanolysis , 2005 .

[5]  T. Yamaguchi,et al.  Preparation of New Solid Bases Derived from Supported Metal Nitrates and Carbonates , 2002 .

[6]  Dora E. López,et al.  Transesterification of triacetin with methanol on solid acid and base catalysts , 2005 .

[7]  W. P. Scarrah,et al.  Rapeseed oil transesterification by heterogeneous catalysis , 1984 .

[8]  Dora E. López,et al.  Synthesis of Biodiesel via Acid Catalysis , 2005 .

[9]  J. Fierro,et al.  Structure and reactivity of alkali-doped calcium oxide catalysts for oxidative coupling of methane , 1993 .

[10]  Eric J. Doskocil,et al.  Transesterification of soybean oil with zeolite and metal catalysts , 2004 .

[11]  U. Schuchardt,et al.  Transesterification of vegetable oils: a review , 1998 .

[12]  Hak Joo Kim,et al.  TRANSESTERIFICATION OF VEGETABLE OIL TO BIODIESEL USING HETEROGENEOUS BASE CATALYST , 2004 .

[13]  J. V. Gerpen,et al.  Biodiesel processing and production , 2005 .

[14]  J. Lunsford,et al.  Oxidative dimerization of methane over a lithium-promoted magnesium oxide catalyst , 1985 .

[15]  C. R. Wolf,et al.  Utilization of metal complexes as catalysts in the transesterification of Brazilian vegetable oils with different alcohols , 2004 .

[16]  K. Wilson,et al.  Li–CaO catalysed tri-glyceride transesterification for biodiesel applications , 2004 .

[17]  T. Baba,et al.  Selective transesterification of triolein with methanol to methyl oleate and glycerol using alumina loaded with alkali metal salt as a solid-base catalyst , 2005 .

[18]  Wenlei Xie,et al.  Transesterification of soybean oil catalyzed by potassium loaded on alumina as a solid-base catalyst , 2006 .