Microwave-Assisted Oxidative Degradation of Lignin Catalyzed by Hydrogen Peroxide–Alkaline Ionic Liquid System
Catalysts,
Год журнала:
2025,
Номер
15(4), С. 367 - 367
Опубликована: Апрель 9, 2025
In
recent
years,
various
green
solvents
have
played
more
and
important
roles
in
catalysis
biomass
studies.
this
work,
three
imidazolium
anion-based
alkaline
ionic
liquids
(ILs,
including
[BMIM]Im,
[Ch]Im,
[N4222]Im)
were
selected
to
catalyze
the
oxidative
degradation
of
lignin
by
a
microwave-assisted
hydrogen
peroxide–alkaline
liquid
system
for
first
time,
which
aimed
promote
depolymerization
high-value
conversion
increase
number
alcohol
hydroxyl
groups
reactivity
lignin.
The
changes
before
after
taken
as
primary
indices.
As
main
conditions,
influence
microwave
exposure
power,
concentration,
peroxide
concentration
on
efficacy
was
subsequently
examined
that
exhibited
most
effective
performance.
addition,
extracted
reaction
solution
analyzed
combination
with
gas
chromatography–mass
spectrometry
(GC–MS),
degraded
solids
characterized
scanning
electron
microscopy
(SEM),
ultraviolet
visible
(UV–Vis)
spectroscopy,
Fourier-transform
infrared
spectroscopy
(FT–IR),
thermogravimetric
derivative
(TG–DTG)
methods,
determined
composition
products,
mechanism,
intuitive
structural
lignin,
thereby
providing
insights
into
extent
solvents.
Язык: Английский
Elucidating and Controlling Reaction Pathways for 2-Methylfuran Aromatization Using Bifunctional Zeolite Catalysts
ACS Sustainable Chemistry & Engineering,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 9, 2025
Understanding
and
controlling
the
reaction
pathways
is
pivotal
in
achieving
heightened
selectivity
for
aromatics
from
catalytic
pyrolysis
of
biofurans.
Herein,
liquid
nitrogen
quenching-dissolution-extraction
situ
diffuse
reflectance
infrared
Fourier
transform
spectroscopy
(DRIFTS)
techniques
were
employed
to
elucidate
mechanistic
converting
2-methylfuran
(MF)
into
aromatics.
Bifunctional
HZSM-5
catalysts
developed
regulate
aromatic
selectivity.
Key
intermediates
identified
conversion
MF
over
include
olefins,
dimethylbenzofuran
(DBF),
2-cyclopenten-1-ones
(CPOs).
Three
possible
aromatization
discovered:
(1)
cracks
olefins
that
polymerize
aromatics;
(2)
oligomerizes
DBF,
then
decarbonizes
form
alkylbenzenes,
dominant
at
low
temperatures;
(3)
forms
CPOs,
which
deoxygenate
benzene
alkylbenzenes─the
most
significant
pathway.
Introducing
metal
oxides
(Fe,
Mo,
Zn)
zeolites
alters
Brønsted
Lewis
acid
ratios,
positively
correlating
with
CPO
content,
resulting
increased
decreased
coke
formation.
These
findings
can
provide
new
insights
biofuran
critical
issues
biomass,
such
as
rational
design
improved
zeolite
catalysts.
Язык: Английский
Multi-step pre-treatment of rice husk for fractionation of components including silica
Frontiers in Chemistry,
Год журнала:
2025,
Номер
13
Опубликована: Янв. 23, 2025
Introduction
Rice
husk,
a
widely
available
agricultural
by-product
lignocellulosic
biomass,
is
promising
and
sustainable
feedstock
for
organic
inorganic
chemicals
due
to
the
rich
silica
content.
However,
its
current
application
largely
limited,
with
most
being
incinerated
as
waste.
This
study
introduces
novel
multi-step
pre-treatment
process
fractionate
these
components
efficiently,
enabling
their
comprehensive
valorization.
Methods
The
begins
hydrothermal
treatment,
selectively
extracting
hemicellulose
while
preserving
structural
integrity
of
other
components.
followed
by
an
organosolv
treatment
using
ethanol/water
mixture,
optimized
dissolve
extract
lignin
effectively.
Subsequently,
alkaline
aqueous
solution
under
nitrogen
atmosphere
facilitates
recovery
sodium
silicate,
valuable
industrial
precursor.
To
ensure
high-purity
cellulose
recovery,
final
step
employs
processing
oxygen,
achieving
effective
depolymerization
removal.
Results
discussion
Each
was
carefully
optimized,
considering
parameters
such
temperature,
solvent
composition,
reaction
time,
enhance
selectivity
yield.
Notably,
this
method
reduces
environmental
negative
impact
avoiding
use
acids
utilizing
renewable
solvents.
sequential
treatments
resulted
in
separation
exceeding
97%
hemicellulose,
lignin,
silica,
leaving
loss
22.8
wt%.
Hemicellulose,
removed
fractions
were
66.5,
78.1,
77.5
wt%
at
first,
second,
third
treatments,
respectively.
Язык: Английский
Feruloyl-CoA synthetases and feruloyl-CoA hydratase/lyases: Expression, biochemical characterisation, and generation of vanillin from ferulic acid and lignocellulosic hydrolysates
Methods in enzymology on CD-ROM/Methods in enzymology,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Язык: Английский
Unlocking the Potential of Lignin-based Polyhydroxyurethanes: Insights into Kinetics, Physical Behavior, and Recyclability
Materials Today Sustainability,
Год журнала:
2025,
Номер
unknown, С. 101117 - 101117
Опубликована: Апрель 1, 2025
Язык: Английский
Valorization of Camellia oleifera through integrated lignin extraction and tunable nanoparticle synthesis
Yuping Wu,
Chengyun Deng,
Xiaolu Zhao
и другие.
AIP Advances,
Год журнала:
2025,
Номер
15(4)
Опубликована: Апрель 1, 2025
The
high-value
utilization
of
Camellia
oleifera,
a
major
agroforestry
waste,
is
critical
for
sustainable
biomass
management.
This
study
presents
green
integrated
process
efficient
lignin
extraction
and
controllable
nanoparticle
synthesis
via
acidic
solvent
solvent-exchange
nanotechnology.
Two
systems
were
systematically
optimized:
HCl/1,4-dioxane
achieved
higher
purity
(71.53%–73.52%)
under
optimal
conditions
(110
°C,
75
min,
90%
ratio),
whereas
p-TsOH/ethylene
glycol
low
eutectic
(70
65%
ratio)
yielded
superior
efficiency
(27.38%–28.74%).
Subsequent
exchange
enabled
precise
regulation
morphology
size.
Solvent
polarity
governed
structural
outcomes,
with
acetone
producing
elongated
porous
particles
(153
±
1
nm,
PDI
=
0.322)
tetrahydrofuran
(THF)
generating
uniform
spheres
(140
0.109).
FTIR
zeta
potential
analyses
revealed
that
tetrahydrofuran’s
hydrophobic
effects
enhanced
surface
electronegativity
(−37.5
mV),
conferring
exceptional
colloidal
stability
(<1%
size
increase
over
30
days).
Synergistic
optimization
THF/water
ratio
(50%)
concentration
(0.7
mg/ml)
produced
ultrasmall
nanoparticles
(80
0.082).
work
elucidates
the
multiscale
mechanism
in
extraction-nanostructuring
establishes
low-carbon
pathway
waste
valorization.
methodology
demonstrates
significant
advancing
material
nanotechnology
applications
through
biomass-derived
functional
nanomaterials.
Язык: Английский