BARROS, T. R. B.; http://lattes.cnpq.br/3149481445946471; BARROS, Thiago Rodrigo Barbosa.
Résumé:
Biodiesel, which is produced from vegetable oils or animal fats by transesterification
reaction with alcohol, is an excellent substitute for diesel oil being a biodegradable fuel
derived from renewable. The molecular sieve MCM-41 has the potential to process fatty
acids aiming biodiesel production, by controlling the chemical composition and
subsequent chemical treatments to their synthesis. The inclusion of metallic oxides can
provide an increase in catalytic performance of the molecular sieve, allowing th e
preparation of catalysts with higher activity, selectivity and thermal stability. This study
aims to obtain biodiesel from the transesterification reaction of soybean oil using the catalyst MoO3/25CeO2/MCM-41. To this affinity, the molecular sieve was prepared
starting with a gel with the following molar composition of the reaction mixture: 1SiO2
: 0,30 CTABr : 11 NH3 : 144 H2O. The incorporation of cerium and molybdenum (by
weight) in the MCM-41 was supported by dry. Through the XRD patterns it was
possible to identify the peaks characteristic of MCM-41 molecular sieve, as well as
phases of cerium and molybdenum oxides in the molecular sieve structure, confirming
the impregnation process. By means of the nitrogen adsorption isotherm molecular
sieve had a surface area SBET de 1072 m2/g and isotherm type IV characteristic of mesoporous materials. The catalyst containing 15% by weight molybdenum and 25%
by weight cerium reached the highest methyl ester conversion around 93% as well as
density of 0.8832 g/cm3, kinematic viscosity 4,044 mm2/s and acidity of 0,49 mg
KOH/g