The effect of the presence of reduced Co and Ni (chosen as representative metals because of their good activity
for dehydrogenation reactions) on the catalytic performance of basic mixed oxide (Mg-Al) for ethanol condensation
is studied in this work. This effect has been studied both in absence and in presence of hydrogen, and
considering the different steps of this complex reaction. Globally, best results were obtained with Co/MgAl,
under reducing atmosphere, at mild temperature (below 600 K). At these conditons, 1-butanol production rates
are up to eight times higher than the obtained with Mg-Al under inert atmosphere. Co has a marked activity in
the dehydrogenation step, that prevails over its less relevant activity in aldolization and hydrogenation reactions.
This result indicates the relevant role of this first reaction step. DRIFT spectroscopy analyses were carried
out to support the experimental results and to identify the role of hydrogen and metals on the oligomerization
and permanent adsorption processes, which can produce the deactivation of the catalyst.- Gobierno de España (CTQ2014-52956-C3-1-R)
- Gobierno del Principado de Asturias. Programa Severo Ochoa (PA-14-PF-BP14-105
