Vanillin
is
currently
the
most
abundant
aromatic
molecule
produced
from
lignin
on
an
industrial
scale
and
one
of
few
renewable
resources
that
can
be
readily
catalyzed
to
obtain
alkanes.
The
hydrogenation
vanillin
as
a
model
has
been
hot
research
topic
in
catalytic
community.
potential
upgraded
value-added
compounds
by
hydrogenation,
its
valuable
products
are
usually
vanillyl
alcohol
(VA)
2-methoxy-4-methylphenol
(MMP).
difficulty
this
reaction
lies
selectivity
control
products.
Complete
conversion
both
cannot
achieved
with
either
noble
or
non-precious
metal
catalysts
same
system.
For
vanillin,
usual
achieve
complete
product
partial
In
our
work,
we
developed
novel
bimetallic
catalyst
encapsulated
nitrogen-rich
carbon
achieve,
for
first
time,
selective
regulated
two
products,
i.e.,
96%
100%
MMP,
use
nitrogen-doped
(NDC)
carrier
Ni
nanoparticles
allows
charge
transfer
carrier,
NDC,
resulting
oxidation
corrected.
Combined
more
favorable
deoxidation
activity
Co,
inexpensive,
simple
prepare,
stable
performance,
easy
separate,
high
activity,
have
advantage
being
tunable
target
product.
Due
synergistic
effect
Co
bimetals,
almost
completely
stopped
at
step
VA
generation
active
center
adjusted
controlling
temperature
flow
system
other
MMP
100%,
which
never
reported
before.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(7), P. 2611 - 2620
Published: Feb. 2, 2024
Chemical
reductions
of
lignin
are
useful
to
remove
oxygen
and
create
product
slates
that
can
function
as
renewable
platform
molecules
for
new
fuels
chemicals.
Catalytic
transfer
hydrogenolysis
(CTH)
is
an
underexplored
method
reduce
obviates
the
use
dangerous
nonrenewable
hydrogen
gas.
While
noble
metals
used
extensively
catalysts
hydrogenation,
sustainability
remains
a
major
challenge
their
deployment.
In
this
work,
we
synthesized
mixed-metal
oxides
earth-abundant
Co
Ni
characterized
using
powder
X-ray
diffraction
(XRD).
Catalyst
reactivity
CTH
acetophenone
was
also
assessed.
Among
tested,
spinel
NiCo2O4
demonstrated
highest
conversion
(75%)
selectivity
ethylbenzene
(90%);
thus,
applied
it
valorize
switchgrass
lignin,
extracted
under
mild
operating
conditions
by
cosolvent
enhanced
lignocellulosic
fractionation
(CELF).
The
catalytically
depolymerized
showed
increase
in
number
selectively
deoxygenated
monomeric
compounds.
As
2D-NMR
spectroscopy,
displayed
highly
reduced
aliphatic
carbons,
resulting
from
catalyst-mediated
reduction
reaction
at
Cα
sites.
These
results
critical
further
development
lignin-first
biorefinery
they
demonstrate
sustainable
catalyst
materials
transformation
generate
refine
suite
bioproducts.
Tetrahedron Green Chem,
Journal Year:
2023,
Volume and Issue:
2, P. 100020 - 100020
Published: July 15, 2023
The
problems
associated
with
the
use
of
molecular
hydrogen
(transportation,
storage
and
high
cost)
have
pushed
scientists
to
pursuit
efficient
donors,
able
reduce
chemical
bonds
in
presence
catalysts
through
catalytic
transfer
hydrogenation
(CTH)
reactions.
In
this
sense,
formic
acid
stands
up
as
one
most
important
safest
molecules
for
H2
generation
under
mild
conditions.
It
can
be
obtained
from
biomass
different
transformations
used
well
upgrade
platform
chemicals.
This
review
summarizes
recently
published
studies
dealing
production
(using
glucose
representing
molecule)
along
its
involved
reactions
groups
chemicals
upgrading.
Energy & Fuels,
Journal Year:
2023,
Volume and Issue:
37(5), P. 3799 - 3812
Published: Feb. 10, 2023
A
promising
method
for
transforming
lignin
derivatives
into
high-value
chemicals
and
biofuels
is
hydrodeoxygenation
(HDO),
which
anticipated
to
be
a
viable
feasible
protocol
the
biorefinery.
Nonetheless,
requirements
of
high
temperature
H2
pressure
are
two
main
hurdles
in
HDO
process.
Herein,
we
developed
highly
active
Pd-decorated
Bi2MoO6
nanoflakes
complete
selective
vanillin
(a
typical
lignin-derived
platform
molecule)
conversion
at
room
mild
pressure.
The
acquired
results
reveal
that
selection
solvents
has
detrimental
effect,
specifically
on
product
selectivity.
When
reaction
was
performed
dichloromethane
solvent,
2-methoxy-4-methylphenol
(MMP)
obtained
after
4
h
with
>99%
MMP
Conversely,
if
water
medium,
it
suppresses
formation
MMP,
resulting
vanillin's
hydrogenation
vanillyl
alcohol
(VOL)
88%
91%
VOL
X-ray
photoelectron
spectroscopy
(XPS),
Raman,
Fourier
transform
infrared
(FT-IR),
ultraviolet
(UV)–visible
adsorption
experimental
studies
revealed
superior
catalytic
performance
presented
catalyst
due
efficient
reactant
preferentially
through
aldehyde
moiety
over
surface
enhancement
oxygen
vacancies
(SOVs)
bismuth
molybdate
as
result
treatment
NaBH4
used
Pd
nanoparticle
deposition.
No
significant
loss
activity
multiple
cycles
proves
stability
good
recyclability
proposed
catalyst.
This
study
improves
catalysis
strategy
paves
path
toward
development
advanced
metal-based
catalysts
valuable
fuels
chemical
production
from
biomass
under
conditions.
Chemie Ingenieur Technik,
Journal Year:
2022,
Volume and Issue:
94(11), P. 1611 - 1627
Published: Oct. 11, 2022
Abstract
For
the
transition
towards
greener
biorefineries
with
reduced
waste,
valorization
of
lignin
to
drop‐in
chemicals
instead
their
combustion
for
energy
purposes
is
a
key
issue
future
processes.
In
this
context,
should
be
extracted
from
lignocellulosic
biomass
(LCB)
and
fragmented
into
smaller
units,
followed
by
catalytic
funneling
fine
chemicals.
review,
we
report
on
classical
approaches
LCB:
thermal
treatments,
solvolytic
valorization,
acid‐catalyzed
process,
base‐catalyzed
process.
We
also
provide
reader
modern
approach
that
led
an
integrated
LCB
biorefinery.
The
performance
different
solid
catalysts
in
lignin‐first
via
reductive
or
oxidative
fractionation
at
conditions
discussed
detail.
