Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 130, Issue -, Pages 314-324Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2012.11.009
Keywords
Molybdenum; Heterogeneous catalysis; Esterification; Biodiesel; Acid sites; Silica; Sol-gel process
Funding
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- FINEP (Financiadora de Estudos e Projetos)
- Araucaria Foundation
Ask authors/readers for more resources
Molybdenum-containing silica easily synthesized by the sol-gel process was evaluated as catalyst for heterogeneous esterification reaction of fatty acids using methanol and ethanol. The molybdenum content depended on the conditions employed during the synthesis. The solids were characterized by X-ray powder diffraction, textural analysis, X-ray photoelectronic spectroscopy, and inductively coupled plasma optical emission spectroscopy. The strength and distribution of the acid sites were assessed by the adsorption-desorption of n-butylamine as monitored by Fourier transform infrared spectroscopy and thermogravimetric analysis. Kinetic studies revealed high fatty acid conversion for both alcohols and diminished activity upon decreasing concentration of acid sites. Monitoring of the acid sites during the recycling experiments indicated association of the catalytic activity with Mo oxide species on the surface and with the availability of molybdenum-active sites displaying Bronsted-Lowry acidity in the silica structure. (c) 2012 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available