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The Ministry of Science and Innovation (Spain) funded this study
under project CTQ2008-04261/PPQ. E. Rojas and R. López-Medina
thank CONACYT (Mexico) and AECID-MAE (Spain), respectively, for
their Ph.D. program fellowships. The authors express their thanks to
Olaf Torno (Sasol Germany GmbH) for providing alumina support.
Thanks are extended to the organizers of the Group Five Sympo-
sium and guest editors of this special issue, Profs. Guido Busca and
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