Andrijanto, E., Dawson, E.A. and Brown, D.R. (2012) Hypercrosslinked polystyrene sulphonic acid catalysts for the esterification of free fatty acids in biodiesel synthesis. Applied Catalysis B: Environmental, 115-6. pp. 261-268. ISSN 09263373
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New sulphonic acid catalysts supported on hypercrosslinked polystyrene have been studied in the esterification of oleic acid with methanol and in the rearrangement of α-pinene to camphene and limonenes. The catalysts have been characterised in terms of specific surface areas and porosities, affinities for water and for cylcohexane vapours, and both concentrations and strengths of acid sites. They have been compared with conventional macroporous polystyrene sulphonic acids (Amberlysts 15 and 35) and SAC-13, a composite between Nafion and silica. The results show that the hypercrosslinked polystyrene sulphonic acids, despite exhibiting relatively low concentrations of acid sites and acid site strengths below those of Amberlysts 15 and 35, are very much more catalytically active than conventional resins in reactions such as the esterification in which high acid site strengths are not required. It is thought that this is due to the highly accessible acid sites throughout the catalyst particles. Reusability studies are reported and it appears that the temperature at which the catalyst is used is important in controlling and minimising catalyst deactivation.
|Additional Information:||this is the author’s version of a work that was accepted for publication in Applied Catalysis B: Environmental. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Catalysis B: Environmental Volumes 115–116, 5 April 2012, Pages 261–268 doi:10.1016/j.apcatb.2011.12.040|
|Subjects:||Q Science > QD Chemistry|
|Schools:||School of Applied Sciences|
|Depositing User:||Graham Stone|
|Date Deposited:||11 Apr 2012 11:36|
|Last Modified:||03 May 2012 16:05|
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