Synthesis of CaO-SiO2 catalyst from lime mud and kaolin residue forbiodiesel production

In the present work, synthesis of CaO-SiO2 catalysts using industrial wastes including lime mud and kaolin residuewas proposed. The CaO-SiO2 catalysts were synthesized through a simple precipitation followed by calcination at 950degrees C. The synthesized catalysts consisted of quartz, CaO and Ca(OH)(2) proportion of which depended onCaO:SiO2 ratio. The catalytic activity was also investigated. The FAME yield reached up to 93% when the catalyst withCaO:SiO2 = 2 was used. However, it was found to decrease with numbers of reuse. (C) 2020 Elsevier B.V. All rightsreserved.