Study on Hydrogen Reduction Kinetics of Iron Oxide by-Product from Steel Industry
Journal of Sustainable Metallurgy,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
Язык: Английский
Experiments and Simulations on the Low-Temperature Reduction of Iron Ore Oxide Pellets with Hydrogen
Metals,
Год журнала:
2025,
Номер
15(3), С. 289 - 289
Опубликована: Март 6, 2025
This
article
examines
the
low-temperature
reducibility
of
four
types
iron
ore
pellets
in
a
pure
hydrogen
atmosphere,
with
aim
understanding
thermodynamic
aspects
process.
The
research
focuses
on
optimizing
conditions
for
pellet
reduction
order
to
reduce
CO2
emissions
and
improve
production
efficiency.
Experimental
tests
were
conducted
at
temperatures
600
°C
800
°C,
supplemented
by
simulations
predicting
equilibrium
composition
energy
requirements.
Chemical
microstructural
analyses
revealed
that
porosity,
mineralogical
composition,
phase
distribution
homogeneity
significantly
affect
High-quality
low
SiO2
content
demonstrated
best
ability,
while
fluxed
presence
calcium
silicate
ferrites
higher
showed
lower
potential
due
hard-to-reduce
phases
such
as
silicates.
results
highlight
importance
controlling
process
properties
enhance
minimize
environmental
impacts.
study
provides
valuable
insights
application
industrial
conditions,
contributing
decarbonization
metallurgical
industry.
Язык: Английский
Anisotropic Porous Iron-Based Nanoparticles through Two-Step Hydrothermal and Hydrogen-Based Reduction: Enhanced Magnetic Performance for Potential Biomedical Applications
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 7, 2025
Iron-based
nanoparticles
have
emerged
as
promising
candidates
for
diverse
biomedical
applications,
including
cell
separation,
targeted
drug
delivery,
hyperthermia
therapy,
and
magnetic
resonance
imaging.
This
study
reports
the
scalable
synthesis
of
high-magnetization
iron-based
with
controlled
anisotropic
shapes,
achieved
via
a
two-step
process.
Hematite
nanoparticles,
featuring
nanocube,
nanoellipse,
nanoneedle
morphologies,
were
synthesized
through
hydrolysis
ferric
chloride
in
presence
ammonium
dihydrogen
phosphate,
morphology
precisely
tuned
by
adjusting
reagent
concentrations.
These
hematite
subsequently
reduced
hydrogen-based
direct
reduction
at
480
°C,
yielding
iron-magnetite
nanocomposites
that
retained
their
exhibited
significant
porosity,
an
exceptional
saturation
magnetization
207
emu/g
-
approximately
150%
higher
than
conventional
magnetite
nanoparticles.
Comprehensive
characterization
SQUID
magnetometry,
Mössbauer
spectroscopy,
Rietveld
refinement
X-ray
diffraction
data,
XPS
surface
analysis
confirmed
formation
metallic
iron
covered
shell.
Biocompatibility
studies
demonstrated
biocompatibility
these
across
wide
concentration
range,
underscoring
suitability
applications.
Язык: Английский
Eco-Friendly Catalyst Design: Transforming volcanic lava ashes into sustainable synthesis of glycerol carbonate from glycerol in one pot solvent-free route
Journal of environmental chemical engineering,
Год журнала:
2025,
Номер
unknown, С. 116030 - 116030
Опубликована: Март 1, 2025
Язык: Английский
Hydrogen-Induced Transformations in Dolomite: Unlocking Natural Hydrogen Exploration and Subsurface Storage in Carbonates
Energy & Fuels,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 21, 2025
Язык: Английский
Reduction of Iron Oxide (Alpha-Fe2o3) with a Hydrogen Rich Plasma Produced by an Electron Cyclotron Wave Resonance Source
Опубликована: Янв. 1, 2025
Язык: Английский
Characteristics of NH3–H2 Reducing Pellets
Metals,
Год журнала:
2024,
Номер
14(12), С. 1314 - 1314
Опубликована: Ноя. 21, 2024
The
reduction
of
hematite
with
ammonia
is
a
potentially
environmentally
friendly
method
ironmaking.
Previous
studies
on
pellets
typically
involved
samples
weighing
only
2.8
g
and
lacked
detailed
activation
energy
analysis
for
the
ammonia-hydrogen
co-reduction
pellets.
Therefore,
to
further
investigate
thermodynamics
kinetics
NH3–H2
pellets,
this
study
uses
50
experiments.
By
increasing
pellet
mass,
expands
scope
kinetic
research
results
indicate
that
nitrogen
gas
produced
from
decomposition
reduces
equilibrium
components
reducing
gas.
In
temperature
range
700–850
°C,
formation
iron
nitride
exhibits
narrow
during
hematite.
rate
using
100%
NH3
lower
than
50%
H2
mixed
gas,
which
is,
in
turn,
slower
H2.
As
increases,
effect
approaches
Among
common
gas-solid
reaction
mathematical
models,
Phase-boundary-controlled
model
Contracting
Cylinder
Model
selected
as
most
plausible
mechanistic
function.
For
energies
reactions
NH3,
H2,
are
65.42,
54.37,
29.17
kJ/mol,
respectively.
has
negative
Fe2O3.
XRD
electron
microscopy
element
line
scanning
show
Fe4N
formed
Fe2O3
NH3.
use
mixture
significantly
Язык: Английский