Ligand migration from cluster to support: a crucial factor for catalysis by Thiolate-protected gold clusters
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Cita com:
hdl:2117/126130
Tipus de documentArticle
Data publicació2018-09-17
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Abstract
Thiolate
protected
metal
clusters
are valuable
precursors
for the
design
of tailored
nanosized
catalysts.
Their
performance
can
be tuned
precisely
at atomic
level,
e.g. by the configuration/
type
of ligands
or by partial/complete
removal
of the ligand
shell
through
controlled
pre-treatment
steps.
However,
the
interaction
between
the ligand
shell
and
the oxide
support,
as
well
as ligand
removal
by oxidative
pre-treatment,
are
still
poorly
understood.
Typically,
it was
assumed
that
the thiolate
ligands
are simply
converted
into
SO
2
, CO
2
and
H
2
O. Herein,
we
report
the first
detailed
observation
of sulfur
ligand
migration
from
Au to the oxide
support
upon
deposition
and
oxidative
pre-treatment,
employing
mainly
S K-edge
XANES.
Conse-
quently,
thiolate
ligand
migration
not only
produces
clean
Au
cluster
surfaces
but
also
the
surrounding
oxide
support
is
modified
by sulfur-containing
species,
with
pronounced
effects
on catalytic
properties
CitacióZhang, B., Sels, A., Salassa, G., Pollitt, S., Truttmann, V., Rameshan, C., Llorca, J., Olszewski, W., Rupprechter, G., Bürgi, T., Barrabés, N. Ligand migration from cluster to support: a crucial factor for catalysis by Thiolate-protected gold clusters. "ChemCatChem", 17 Setembre 2018, vol. 10, núm. 23, p. 5372-5376.
ISSN1867-3880
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