Abstracts Book - IMRC 2018

• SF3-P047
ESTERIFICATIONOF GLYCEROL OVER ALUMINA-BASED OXIDES
WITH A DEFINED PORE HIERARCHY
José Vitor Costa Do Carmo 1 , Alcineia Oliveira 1 , Jesuina Cassia Santiago de Araújo 2 , Adriana F
Campos 3 , Gian Carlos Silva Duarte 4
1 Universidade Federal do Ceará, DQAFQ, Brazil. 2 Universidade Federal do Espírito Santo,
Centro Universitário Norte do Espírito Santo, São Mateus, Espirito Santo, Brazil. 3 Centro de
Tecnologias Estratégicas do Nordeste-CETENE, Lab. de Nanotecnologia, Recife, Pernambuco,
Brazil. 4 Centro de Tecnologias Estratégicas do Nordeste-CETENE, Lad de Nanotecnologia,
Recife,Pernambuco, Brazil.
The esterification of glycerol with acetic acid reaction led to high value added
products such as the esters of glycerol (monoactin, diacetin and triacetin). These
products can be used to produce additives for Biodiesel and gasoline, antifreeze,
cosmetics, and so on. Traditionally, the main catalysts for this reaction are the
acidic solids possessing Brønsted and Lewis acid sites. However, the main
drawback associated to their use in the reaction is the leaching of the active
sites. This work aims to produce solids with a defined hierarchy of pores to be
used in the esterification of glycerol with acetic acid. The solids possessing
moderate acidity were obtained by sol-gel method with using CTAB
(cetyltrimethylammonium bromide) and PVP (polyvinylpyrrolidone), as pore
expanding agents. The physicochemical properties were characterized by X-ray
diffraction and N 2 adsorption/desorption, FTIR, TEM, SEM-EDS and temperatureprogrammed
NH 3 desorption The porous SiAl catalyst provided the best
catalytic results, with conversions of 50%, and selectivity towards the esters of
glycerol of approximately 40%. The higher surface area generated by mesomacroporosity
in the TiAl, compared to the micro-macroporous SiAl, provided
good access for the diffusion of reactants and products, and good dispersion of
active sites with preferential triacetin formation at certain reaction
conditions.The greater contributions of the acid sites together with the presence
of pores with defined hierarchy resulted in higher catalytic activities.
Acknowledgment:
The authors acknowledge support CNPq-FAPES Grant n o DCR-0049-1.06/08.
Keywords: Alumina based oxides, pore expanding agents, glycerol esterification
Presenting authors email: alcineia@ufc.br