Lignin
hydrodeoxygenation
(HDO)
offers
a
sustainable
pathway
for
obtaining
aromatic
compounds
from
renewable
sources
instead
of
relying
on
fossil
fuels.
In
this
study,
an
aqueous
catalytic
system
was
developed
based
the
synergistic
effect
combining
nickel
(Ni)
and
zinc
(Zn)
with
ruthenium
(Ru)
nanoclusters
Nb2O5.
Utilizing
RuNiZn/Nb2O5
catalyst,
poplar
lignin
successfully
depolymerized,
achieving
impressive
yield
40.1
wt%
monomers
under
reaction
conditions
240
℃
4
h,
which
outperformed
previously
reported
metal-oxide
carbon
materials
employed
in
alcohol
systems.
In-situ
XPS
analysis
revealed
remarkable
hydrogen
spillover
between
Ni
Ru,
leading
to
efficient
hydrogenation
reactions
reducing
need
noble
metal
dosage.
Furthermore,
presence
Zn
significantly
enhanced
acid
strength
catalyst.
Moreover,
strong
interaction
Ru
Nb2O5
support
contributed
excellent
stability
RuNiZn/Nb2O5.
Even
after
three
cycles,
minor
decrease
monomer
observed,
while
content
remained
relatively
stable.
This
study
underscores
application
potential
Nb2O5-supported
effects
achieved
through
incorporation
nanoclusters.
By
addressing
limited
activity
materials,
these
findings
advance
valorization
HDO.
Sustainable Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
8(12), P. 2668 - 2681
Published: Jan. 1, 2024
Mo-species
(Mo
+5
)
formed
over
alumina
surface
promotes
depolymerization
and
hydrodeoxygenation
simultaneously
in
one-pot
reductive
liquefaction
of
sawdust.
Energies,
Journal Year:
2024,
Volume and Issue:
17(24), P. 6482 - 6482
Published: Dec. 23, 2024
Lignin
is
considered
a
renewable
source
for
the
production
of
valuable
aromatic
chemicals
and
liquid
fuel.
Solvent
depolymerization
lignin
fruitful
strategy
valorization
lignin.
However,
Kraft
highly
prone
to
produce
char
(a
by-product)
during
hydrothermal
process
due
its
poor
solubility
in
organic
solvents.
Therefore,
minimization
formation
remains
challenging.
The
purpose
present
study
was
fractionate
methanol
obtain
low-molecular-weight
fractions
that
could
be
further
depolymerized
supercritical
monomers
suppress
formation.
results
showed
use
methanol-soluble
achieved
bio-oil
yield
45.04%
39.6%
at
280
°C
2
h
compared
28.57%
57.73%,
respectively,
when
using
raw
Elemental
analysis
revealed
high
heating
value
30.13
MJ
kg−1
sulfur
content
only
0.09%
derived
from
extraction
reduced
oxygen
increased
hydrogen
carbon
contents
modified
bio-oil,
indicating
extracted
fraction
had
an
enhanced
deoxygenation
capability
higher
energy
content.
These
findings
highlight
potential
as
resource
sustainable
compounds.
