Acceleration of catalytic activity of calcium oxide for biodiesel production.

This research was aimed at studying the acceleration of the catalytic activity of calcium oxide (CaO) for developing an effective heterogeneous catalyst for biodiesel production by the transesterification of plant oil with methanol. CaO was activated by pretreatment with methanol and was used for the transesterification reaction. The activation and transesterification reaction conditions were examined. The obtained optimal reaction conditions were 0.1-g CaO, 3.9-g methanol, 15-g rapeseed oil, and 1.5-h activation time at room temperature that provided methyl ester in approximately 90% yield within a reaction time of 3h at 60 degrees C. The activation mechanism was also investigated, and the proposed mechanism is as follows. By pretreatment with methanol, a small amount of CaO gets converted into Ca(OCH(3))(2) that acts as an initiating reagent for the transesterification reaction and produces glycerin as a by-product. Subsequently, a calcium-glycerin complex, formed due to the reaction of CaO with glycerin, functions as the main catalyst and accelerates the transesterification reaction.

[1]  Robert L. McCormick,et al.  Combustion of fat and vegetable oil derived fuels in diesel engines , 1998 .

[2]  S. Furuta,et al.  Biodiesel fuel production with solid superacid catalysis in fixed bed reactor under atmospheric pressure , 2004 .

[3]  Jesus Santamaria,et al.  Biodiesel from sunflower oil by using activated calcium oxide , 2007 .

[4]  E. H. Pryde,et al.  Variables affecting the yields of fatty esters from transesterified vegetable oils , 1984 .

[5]  Fang Wang,et al.  Lipase catalyzed methanolysis to produce biodiesel： Optimization of the biodiesel production , 2006 .

[6]  Dora E. López,et al.  Transesterification of triacetin with methanol on Nafion® acid resins , 2007 .

[7]  G. Vicente,et al.  Integrated biodiesel production: a comparison of different homogeneous catalysts systems. , 2004, Bioresource technology.

[8]  Atsushi Takagaki,et al.  Green chemistry: Biodiesel made with sugar catalyst , 2005, Nature.

[9]  L. C. Meher,et al.  Technical aspects of biodiesel production by transesterification—a review , 2006 .

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

[11]  Ayato Kawashima,et al.  Development of heterogeneous base catalysts for biodiesel production. , 2008, Bioresource technology.

[12]  Yomi Watanabe,et al.  Enzymatic alcoholysis for biodiesel fuel production and application of the reaction to oil processing , 2002 .

[13]  Karen Wilson,et al.  Structure-reactivity correlations in MgAl hydrotalcite catalysts for biodiesel synthesis , 2005 .

[14]  Shu-Wei Chang,et al.  Enzymatic approach to biodiesel production. , 2007, Journal of agricultural and food chemistry.

[15]  Karen Wilson,et al.  Structure–activity relations in Cs-doped heteropolyacid catalysts for biodiesel production , 2007 .

[16]  Shiro Saka,et al.  Kinetics of hydrolysis and methyl esterification for biodiesel production in two-step supercritical methanol process , 2006 .

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

[18]  L. C. Meher,et al.  TRANSESTERIFICATION OF KARANJA (PONGAMIA PINNATA) OIL BY SOLID BASIC CATALYSTS , 2006 .

[19]  A. Demirbas,et al.  Biodiesel production via non-catalytic SCF method and biodiesel fuel characteristics. , 2006 .

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

[21]  Takuya Fukumura,et al.  Biodiesel production using anionic ion-exchange resin as heterogeneous catalyst. , 2007, Bioresource technology.

[22]  J. Verkade,et al.  Room-Temperature Conversion of Soybean Oil and Poultry Fat to Biodiesel Catalyzed by Nanocrystalline Calcium Oxides , 2006 .

[23]  P. Rangsunvigit,et al.  Transesterification of crude palm kernel oil and crude coconut oil by different solid catalysts , 2006 .

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

[25]  A. C. Dimian,et al.  Solid acid catalysts for biodiesel production - towards sustainable energy , 2006 .

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