Hydrogenolysis
of
consumer-grade
high-density
polyethylene
(HDPE)
is
a
pivotal
strategy
for
upcycling
plastic
waste
into
value-added
fuels.
Though
Ru
catalysts
demonstrated
activity
in
the
hydrogenolysis
inert
C–C
bonds
HDPE,
precise
design
nanoparticles
still
represents
critical
challenge
to
boost
performance.
Here,
ultrafine
(∼1
nm)
supported
on
MgAl-layered
double
oxides
(MgAl-LDO)
exhibited
selectivity
over
90%
liquid
fuels,
lubricants,
and
waxes
HDPE.
By
tuning
thermal
treatments
Mg/Al
ratios,
Ruδ+/Ru0
ratio
acidity/basicity
MgAl-LDO
were
determined
as
performance
descriptors.
Notably,
confining
effects
layered
structure
can
be
optimized
facilitate
effective
dispersion
nanoparticles,
even
at
elevated
loadings
up
9%.
Moreover,
Ru/Mg1Al-LDO
catalyst
good
applicability
various
HDPE
substrates
excellent
stability,
maintaining
five
recycling
runs.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Nov. 29, 2024
The
surge
in
global
plastic
production,
reaching
400.3
million
tons
2022,
has
exacerbated
environmental
pollution,
with
only
11%
of
being
recycled.
Catalytic
recycling,
particularly
through
hydrogenolysis
and
hydrocracking,
offers
a
promising
avenue
for
upcycling
polyolefin
plastic,
comprising
55%
waste.
This
study
investigates
the
influence
water
on
depolymerization
using
Ru
catalysts,
revealing
promotional
effect
when
both
metal
acid
sites,
Brønsted
site,
are
present.
Findings
highlight
impact
content,
metal-acid
balance,
their
proximity
this
interaction,
as
well
role
modulating
isomerization
process,
affecting
product
selectivity.
Additionally,
interaction
facilitates
suppression
coke
formation,
ultimately
enhancing
catalyst
stability.
A
comprehensive
techno-economic
life
cycle
assessment
underscores
viability
benefits
presence
water.
These
insights
advance
understanding
offer
strategies
optimizing
recycling
processes.
hydrocracking
present
approach
plastics.
Here,
authors
catalytic
upcycling,
emphasizing
that
catalysts
an
optimal
balance
significantly
improve
polyethylene
is
JACS Au,
Journal Year:
2024,
Volume and Issue:
4(6), P. 2081 - 2098
Published: June 4, 2024
Single-use
polyolefins
are
widely
used
in
our
daily
life
and
industrial
production
due
to
their
light
weight,
low
cost,
superior
stability,
durability.
However,
the
rapid
accumulation
of
plastic
waste
low-profit
recycling
methods
resulted
a
global
crisis.
Catalytic
hydrogenolysis
is
regarded
as
promising
technique,
which
can
effectively
selectively
convert
polyolefin
value-added
products.
In
this
perspective,
we
focus
on
design
synthesis
structurally
well-defined
catalysts
across
mesoscopic,
nanoscopic,
atomic
scales,
accompanied
by
insights
into
future
directions
catalyst
for
further
enhancing
catalytic
performance.
These
principles
also
be
applied
depolymerization
other
polymers
ultimately
realize
chemical
upcycling
plastics.
Langmuir,
Journal Year:
2024,
Volume and Issue:
40(33), P. 17212 - 17238
Published: Aug. 7, 2024
Plastics
are
widely
used
materials
in
our
daily
lives
and
various
industries
due
to
their
affordability
versatility.
The
massive
production
of
plastic
waste,
however,
has
recently
emerged
as
a
pressing
environmental
concern
across
all
media.
To
address
this,
emerging
technologies
being
explored
for
the
sustainable
valorization
postconsumer
wastes
including
thermochemical,
physical,
catalytic
processes
aimed
at
transforming
them
into
higher
value-added
products.
However,
chemical
recycling
mixed
poses
formidable
challenge
diverse
array
monomers
catalyst
systems
involved,
each
employing
distinct
mechanisms.
Complicating
matters
further
is
that
contaminants
reduce
efficacy,
requiring
rigorous
labor-intensive
separation
purification
extract
individual
streams
from
practical
waste
mixtures.
Consequently,
majority
such
mixtures
often
end
up
incineration
landfills,
perpetuating
societal
challenges,
leachate,
carbon
dioxide
emissions,
other
air
pollutants.
This
review
will
introduce
current
technical
developments
available
through
processes.
challenges
process
performance,
low
selectivity
desired
products,
deactivation
catalysis
also
discussed.
Promising
approaches
overcome
problems
suggested
future
research
directions.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
The
review
examines
the
structure–function
relationship
and
outlines
future
directions
to
develop
heterogeneous
catalysts
for
C–C
C–O
bonds
cleavage
in
plastic
waste
upcycling
real-world
into
chemicals
fuels.
Energy & Fuels,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 10, 2025
Catalytic
hydrogenolysis
is
emerging
as
an
attractive
strategy
for
converting
polyolefins
into
high-value
hydrocarbon
liquids.
A
key
challenge
in
catalytic
the
high
methane
yield.
Recently,
Ni-based
catalysts
have
shown
promise
a
cost-effective
alternative
to
noble
metals
polyolefin
hydrogenolysis.
In
this
study,
three
alumina-supported
Ni
(12–13
wt
%
Ni)
were
prepared
using
acidic,
neutral,
and
basic
γ-Al2O3
via
impregnation.
The
resulting
Ni/A-Al2O3,
Ni/N-Al2O3,
Ni/B-Al2O3
used
investigate
reaction
pathways
n-hexadecane
isotactic
polypropylene
Experiments
conducted
batch
autoclave
at
300
°C
with
30
bar
of
H2
showed
that
exhibited
highest
reactivity,
5
h
polypropylene,
respectively.
Using
model
compound
hydrogenolysis,
we
attributed
origin
selectivity
terminal
C–C
bond
scission,
occurring
through
both
single-step
cascade
mechanisms.
Detailed
product
analysis
(GC–FID,
GPC,
NMR)
comprehensive
catalyst
characterization
revealed
origins
varied
activity
distribution
polypropylene.
increased
ratio
tetrahedrally
coordinated
Ni2+
metallic
Ni0,
stronger
metal–support
interactions,
along
surface
basicity,
promotes
leading
enhanced
reactivity.
Catalysts,
Journal Year:
2025,
Volume and Issue:
15(4), P. 335 - 335
Published: March 31, 2025
Chemical
recycling
of
plastic
waste,
especially
polyolefins,
into
valuable
liquid
fuels
is
considerable
significance
to
address
the
serious
issues
raised
by
their
threat
on
environmental
and
human
health.
Nevertheless,
construction
efficient
economically
viable
catalytic
systems
remains
a
significant
hurdle.
Herein,
we
developed
an
bifunctional
catalyst
system
comprising
γ-Al2O3-supported
ruthenium
nanoparticles
(Ru/γ-Al2O3)
β-zeolite
for
conversion
polyolefins
gasoline-range
hydrocarbons.
A
yield
C5–12
paraffins
up
73.4%
can
be
obtained
with
polyethene
as
reactant
at
250
°C
in
hydrogen.
The
Ru
sites
primarily
activate
initial
cleavage
C–H
bonds
polymer
towards
formation
olefin
intermediates,
which
subsequently
go
through
further
cracking
isomerization
over
acid
β-zeolite.
Employing
situ
infrared
spectroscopy
probe–molecule
model
reactions,
our
investigation
reveals
that
optimized
proportion
spatial
distribution
dual
are
pivotal
tandem
process.
This
optimization
synergistically
regulates
kinetics
accelerates
intermediate
transfer,
thereby
minimizing
production
side
C1–4
hydrocarbons
resulting
from
over-cracking
enhancing
fuels.
research
contributes
novel
insights
design
chemical
upgrading
chemicals,
advancing
field
waste
sustainable
production.
