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May 13-14, 2019 | Prague, Czech Republic
Chemistry and Medicinal Chemistry
9
th
World Congress on
Asian Journal of Biomedical and Pharmaceutical Sciences | Volume 9
ISSN: 2249-622X
Catalysts for H
2
-cleanup technologies. The role of the support
José Antonio Odriozola
University of Sevilla, Spain
S
ince E. Davy at the beginning of the 19th century is
customarily accepted that metal dispersion plays a
fundamental role in the activity of solid catalysts and
therefore enormous efforts were dedicated to reduce
the size of the active phases since the increase of the
surface-to-volume ratio on reducing particle sizes. The
development of nanotechnology has resulted in synthetic
strategies for nanomaterials allowing metal nanoparticles
with well-defined surfaces. This has lead to fill the gap
between the reactivity of well-defined faces of metal single
crystals and conventionally prepared catalysts with a broad
size distribution of the metal particles with uncontrolled
shape. As a result of these advances the modification of
the catalyst selectivity by altering size and/or shape of the
nanoparticles has been clearly understood as well as the
molecular factors that cause them, including structures,
surface compositions, oxidation states and gaseous
environments. For instance, the size modification affects
the relative proportion of exposed faces of FCC metal
nanoparticles. This has a significant effect on the metal
activity in, for instance, oxidation reactions. However, on
supporting these metal nanoparticles a direct relationship
between the size/shape and the catalytic activity may not
be present
In this talk, we address the role of the support in a set of
relevant catalytic reactions for H
2
-cleanup: WGS, COPROX
and the Sabatier reaction. Operando studies of these
reactions help in understanding the synergies occurring
at the metal interfaces during the catalytic reaction that
sometimes are of greater relevance than size or shape.
e
:
odrio@us.esAsian J Biomed Pharmaceut Sci, Volume:9
DOI: 10.4066/2249-622X-C2-021