ACS Organic & Inorganic Au,
Journal Year:
2024,
Volume and Issue:
4(6), P. 705 - 711
Published: Nov. 19, 2024
Amide
hydrogenation
is
an
important
process
for
producing
amines,
with
the
development
of
efficient
heterogeneous
catalysts
relying
on
creation
bimetallic
active
sites
where
two
components
interact
synergistically.
In
this
study,
we
develop
a
method
preparing
using
ligand-functionalized
organometallic
polyoxometalates
by
synthesizing
Rh-Mo
polyoxometalate,
[(RhCp
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
26(10), P. 5966 - 5976
Published: Jan. 1, 2024
The
bimetallic
nickel
molybdenum
nitride
(Ni
3
Mo
N)
catalyst
exhibits
exceptional
performance
with
a
high
EtOH
yield
(>97.5%)
under
low
pressure
(0.5
MPa)
and
minimal
hydrogen
consumption
(H
2
/DMO
(mol))
conditions.
Primary
diamines
are
valuable
yet
challenging
to
synthesize
due
issues
such
as
product
and
intermediate
condensation
catalyst
poisoning.
To
address
these
problems,
effective
synthesis
systems
must
be
explored.
Here,
2,5-bis(aminomethyl)furan
(BAMF),
a
biomass-derived
primary
diamine,
is
chosen
the
model
for
constructing
system.
A
series
of
carbon-shell
confined
Co
nanoparticles
(Co@CNT-x)
fabricated
BAMF.
The
Co@CNT-700
catalyst,
with
ca.
4
layers
carbon
shells,
achieves
an
outstanding
96%
isolated
yield
BAMF
through
reductive
amination
2,5-diformylfuran
dioxime.
In
this
system,
excess
NH3
atmosphere
necessary
prevent
reactions
by
competitive
reactions,
while
shells
protect
from
amine
Control
experiments
indicate
that
dioxime
primarily
follows
H2-assisted
dehydration
pathway
form
key
imine
intermediates,
side
products
amides
nitriles
can
also
eventually
converted
into
Co@CNT-700,
leading
its
excellent
selectivity.
Notably,
employing
sequential
three-step
strategy,
87%
achieved
directly
using
biomass
raw
material.
evaluate
tolerance
9
other
important
aromatic,
cycloalkyl,
linear
alkyl
diamines,
1,4-cyclohexanediamine,
obtained
in
high
yields
87-99%.
ACS Catalysis,
Journal Year:
2025,
Volume and Issue:
15(8), P. 6216 - 6225
Published: April 2, 2025
The
hydrogenation
of
amides
to
amines
is
an
important
reaction
in
the
synthesis
building
blocks
organic
chemistry.
However,
solvent-free
(requiring
heterogeneous
catalysts
and
high
temperatures)
challenging,
with
low
selectivity
obtained
due
further
hydrogenolysis
alcohol
amine
products.
Such
behavior
was
observed
for
a
CeO2-supported
Pt
catalyst
(Pt/CeO2).
Although
it
known
that
support
promotes
adsorption
amide
on
catalyst,
facilitates
hydrogenation,
their
individual
roles
conversion
how
they
impact
product
remain
unclear.
Using
operando
photoelectron
photoionization
coincidence
(PEPICO)
spectroscopy,
N-ethylpropionamide
studied
over
both
Pt/CeO2
CeO2.
experiments
reveal
active
below
150
°C
produce
selectivity.
Lewis
acidic
(CeO2)
also
at
higher
temperatures,
producing
ethylamine
propanal,
while
being
vulnerable
coking.
nanoparticles
mitigate
coke
formation,
catalyze
products
above
°C.
This
study
provides
insights
bifunctional
metal
oxide--metal
nanoparticle
facilitate
design
superior
catalysts.