Catalysts,
Год журнала:
2024,
Номер
15(1), С. 16 - 16
Опубликована: Дек. 28, 2024
Palladium
(Pd)
is
a
4d
transition
metal
with
electronic
configuration
[Kr]
4d10
5s0,
and
it
one
of
the
most
widely
studied
metals
in
periodic
table
due
to
its
versatile
catalytic
role
organic
synthesis.
The
choice
ligands
that
can
coordinate
Pd
sites
plays
crucial
progress
reaction.
Due
coexistence
multiple
oxidation
states
(Pd(0)/Pd(II)),
active
catalysts
participate
various
stages
coupling
Pd-catalyzed
C-C
reactions
proceed
through
four
steps:
(1)
oxidative
addition
reactant
site,
(2)
transmetallation,
(3)
rearrangements
ligand
centers
(4)
reductive
elimination
products.
For
heterogeneous
nanocatalysts,
are
often
strongly
bound
(chelated)
solid
catalyst
surfaces.
In
this
review,
we
have
highlighted
advancements
made
nanocatalysts
an
emphasis
on
types
different
classes
porous
solids,
which
could
ligate
via
strong
covalent
bonds.
high
specific
surface
areas
small
these
provide
larger
number
thus
facilitate
Mechanistic
aspects
cross-coupling
discussed
context
structure–reactivity
relationship.
Abstract
N‐doped
porous
carbon
shows
great
potential
in
the
field
of
heterogenous
supports
due
to
its
high
porosity,
large
surface
area,
rich
active
sites,
and
strong
chelation
with
catalytic
metals
species.
Herein,
we
successfully
prepared
a
novel
derived
from
sodium
alginate/melamine
blends
(SAMNC)
different
mass
ratio
through
simple
carbonization
activation
process.
Hierarchical
structure
has
been
confirmed
SEM,
TEM,
N
2
adsorption
characterization.
After
Na
PdCl
4
solution
impregnation
further
reduction
process,
Pd
0
nanoparticles
have
uniformly
immobilized
on
SAMNC
support
produce
Pd@SAMNC
catalyst.
The
optimal
Pd@SAMNC‐0.6
possesses
content
(5.13%),
(5.90%),
BET
specific
area
1884.5
m
·g
−1
.
Positron
annihilation
lifetime
spectroscopy
(PALS)
investigation
materials
provided
sub‐nano
level
microporous
information
proofs
had
capability
provide
more
sites
for
reactions
than
commercial
supported
activated
(Pd@AC).
catalyst
showed
superior
efficiency
Heck
coupling
reaction
between
aromatic
halides
alkenes
can
be
recycled
17
runs
without
significant
decrease
efficiency.
Catalysts,
Год журнала:
2024,
Номер
15(1), С. 16 - 16
Опубликована: Дек. 28, 2024
Palladium
(Pd)
is
a
4d
transition
metal
with
electronic
configuration
[Kr]
4d10
5s0,
and
it
one
of
the
most
widely
studied
metals
in
periodic
table
due
to
its
versatile
catalytic
role
organic
synthesis.
The
choice
ligands
that
can
coordinate
Pd
sites
plays
crucial
progress
reaction.
Due
coexistence
multiple
oxidation
states
(Pd(0)/Pd(II)),
active
catalysts
participate
various
stages
coupling
Pd-catalyzed
C-C
reactions
proceed
through
four
steps:
(1)
oxidative
addition
reactant
site,
(2)
transmetallation,
(3)
rearrangements
ligand
centers
(4)
reductive
elimination
products.
For
heterogeneous
nanocatalysts,
are
often
strongly
bound
(chelated)
solid
catalyst
surfaces.
In
this
review,
we
have
highlighted
advancements
made
nanocatalysts
an
emphasis
on
types
different
classes
porous
solids,
which
could
ligate
via
strong
covalent
bonds.
high
specific
surface
areas
small
these
provide
larger
number
thus
facilitate
Mechanistic
aspects
cross-coupling
discussed
context
structure–reactivity
relationship.
