the advantages of the use of heterogeneous catalysts is
their ability to regenerate, which means that they can be reused in
other cycles, resulting in less environmental impact than that of
the homogeneous catalysts. Successive reutilization has demonstrated
its competency in fixing the support and it has also presented
high catalytic activity. Despite the good results obtained
with K2O/Al2O3, part of the active phase of the catalyst is entrained
by the liquid phase, which happens to catalysts made from other
alkali metals as well. This phenomenon (leaching) has been studied
in order to achieve the catalyst’s stability, which is essential
to the development of the theme and to its use in alternative fuels.