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Synthesis of highly porous alumina-based oxides with tailored catalytic properties in the esterification of glycerol

Published online by Cambridge University Press:  22 October 2018

Jose Vitor Costa do Carmo ,
Alcineia C. Oliveira ,
Jesuina C.S. Araújo ,
Adriana Campos  and
Gian Carlos Silva Duarte
Jose Vitor Costa do Carmo
Affiliation:
Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, 60455-760, Fortaleza, Ceara, Brazil
Alcineia C. Oliveira*
Affiliation:
Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, 60455-760, Fortaleza, Ceara, Brazil
Jesuina C.S. Araújo
Affiliation:
Centro Universitário Norte do Espírito Santo, Universidade Federal do Espírito Santo, 29932-540, São Mateus, Espírito Santo, Brazil
Adriana Campos
Affiliation:
CETENE, Cidade Universitária, Recife, Pernambuco 50740-545, Brazil
Gian Carlos Silva Duarte
Affiliation:
CETENE, Cidade Universitária, Recife, Pernambuco 50740-545, Brazil
*
a)Address all correspondence to this author. e-mail: alcineia@ufc.br
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Abstract

Highly porous alumina-based oxides, γ-Al2O3, SiO2–Al2O3, and TiO2–Al2O3 were synthesized by a modified sol–gel method. Polivinylpyrrolidone was used as the pore expanding agent, whereas cetyltrimethylammonium bromide was used as the template in the presence of alkoxide inorganic precursors. Both as-synthesized and calcined solids were used as catalysts for esterification of glycerol with acetic acid (EG). The XRD and SEM-EDS measurements demonstrated that the Si-containing solids are amorphous while those containing Ti are semicrystalline with the latter composed of TiO2 rutile, TiO2 anatase, and γ-Al2O3 phases. All solids possessed ordered porous structures comprising of micro- and mesoporosity, with interconnectivity between these pores of different length scales. The high acidity of γ-Al2O3 and TiO2–Al2O3 materials resulted in good catalytic performances in the EG. Porosity of the solids plays a secondary role in determining the catalytic activity. Under the same conditions, the as-synthesized solids exhibited slightly lower catalytic performances compared to that of the calcined ones.

Keywords

porosityoxideSEM-EDScatalyst
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 21: Focus Issue: Catalytic Engineered Materials for Commercial and Industrial Energy Applications , 14 November 2018 , pp. 3625 - 3633
Copyright
Copyright © Materials Research Society 2018 

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