Chemical Synthesis,
Journal Year:
2024,
Volume and Issue:
4(2)
Published: May 28, 2024
The
chemical
upcycling
method
is
a
promising
strategy
to
alleviate
the
pollution
problem
of
waste
plastics
by
tapping
into
their
intrinsic
value
and
converting
them
high
value-added
products.
Zeolite-based
catalysts
are
one
surprising
efficient
classes
thermocatalytic
materials
that
have
recently
attracted
considerable
attention
for
plastic
upcycling.
They
designed
targeted
applications
with
wide
range
adjustable
acidic
sites,
multiple
pore
structures,
synergistic
interactions
surface
metals.
In
this
review,
we
categorize
being
converted
different
high-value
products
introduce
role
zeolite-based
in
thermal
plastics.
structure-performance
relationships
catalytic
reactions
discussed
depth.
Finally,
future
development
these
multifunctional
applied
outlined.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(17), P. 11438 - 11448
Published: April 16, 2024
Hydro-depolymerization
presents
a
promising
avenue
for
transforming
plastic
waste
into
high-value
hydrocarbons,
offering
significant
potential
value-added
recycling.
However,
major
challenge
in
this
method
arises
from
kinetic
limitations
due
to
insufficient
hydrogen
concentration
near
the
active
sites,
requiring
optimal
catalytic
performance
only
at
higher
pressures.
In
study,
we
address
hurdle
by
developing
"hydrogen
bubble
catalysts"
featuring
Ru
nanoparticles
within
mesoporous
SBA-15
channels
(Ru/SBA).
The
distinctive
feature
of
Ru/SBA
catalysts
lies
their
capacity
physical
storage
and
chemically
reversible
spillover,
ensuring
timely
ample
supply.
Under
identical
reaction
conditions,
activity
surpassed
that
Ru/SiO2
(no
capacity)
over
4-fold.
This
substantial
enhancement
provides
opportunities
atmospheric
pressure
hydro-depolymerization
waste.
The Journal of Physical Chemistry C,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 10, 2025
Plastic
waste
is
a
major
environmental
issue;
converting
it
directly
into
valuable
chemicals
by
using
catalysts
promising
alternative
to
plastic
recycling.
Here,
we
report
the
selective
catalytic
cracking
of
polypropylene
(PP),
typical
commodity
plastic,
high-value
light
olefins
(C2–C5),
below
pyrolytic
temperature
(290
°C)
and
without
external
hydrogen
supply,
zeolite
catalysts.
Among
H+-form
zeolites
with
different
structures,
HMFI
showed
highest
yields
hydrocarbons
which
(C2–C5)
were
products.
The
HMFI-catalyzed
PP
conversion
was
applicable
upcycling
model
waste,
resulting
in
61.9%
hydrocarbon
yield.
results
situ
IR
experiments
small
amount
Brønsted
acid
sites
suggested
that
on
surface
are
indispensable
for
posited
be
active
short-chain
(oligomeric)
species
as
intermediate
Density
functional
theory
analyses
conducted
determine
plausible
reaction
pathways
adopting
2,4-dimethylheptene
shortest
unit
oligomeric
species.
obtained
show
β-scission
isobutene
propylene
(or
propyl
alkoxide
group)
via
carbocation
intermediates
an
activation
energy
118
kJ
mol–1.
Operando
UV–vis
under
conditions,
combined
ex
1H
NMR
13C
spent
catalyst,
some
further
converted
or
heavy
aromatics
(coke
deposit),
probably
carbenium
ion
Green Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Emerging
technologies-empowered
thermochemical
plastic
valorization
is
developed
for
value-added
products
in
green
and
practical
manner,
which
are
beneficial
to
achieving
circular
economy
several
UN
sustainable
development
goals.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(36), P. 46975 - 46987
Published: Aug. 30, 2024
Depolymerization
of
plastics
is
a
leading
strategy
to
combat
the
escalating
global
plastic
waste
crisis
through
chemical
recycling,
upcycling,
and
remediation
micro-/nanoplastics.
However,
critical
processes
necessary
for
polymer
chain
scission,
occurring
at
polymer–catalyst
or
polymer–fluid
interfaces,
remain
largely
overlooked.
Herein,
we
spotlight
importance
understanding
these
interfacial
as
necessity
optimizing
kinetics
reactivity
in
recycling
controlling
reaction
outcomes,
product
distributions,
well
improving
environmental
sustainability
processes.
Several
examples
are
highlighted
heterogeneous
such
hydrogenation
over
solid
catalysts,
immiscible
media,
biocatalysis.
Ultimately,
judicious
exploitation
has
practical
implications
developing
practical,
robust,
cost-effective
reduce
enable
viable
post-use
circular
economy.
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
This
review
comprehensively
explores
various
homogeneous
and
heterogeneous
catalytic
systems
for
the
hydrogenolysis
of
oxygenated
polymeric
wastes
(OXPs),
presenting
an
adaptable
solution
to
plastic
pollution
generating
valuable
feedstock.
Angewandte Chemie,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 22, 2025
Abstract
Depolymerizing
plastic
waste
through
hydrogen‐based
processes,
such
as
hydrogenolysis
and
hydrocracking,
presents
a
promising
solution
for
converting
plastics
into
liquid
fuels.
However,
conventional
hydrogen
production
methods
rely
heavily
on
fossil
fuels,
exacerbating
global
warming.
This
study
introduces
novel
approach
to
that
utilizes
in
situ
generated
via
the
aqueous
phase
reforming
(APR)
of
methanol,
biomass‐derived
chemical
offering
more
sustainable
alternative.
Our
results
show
bimetallic
Ru−Pt/TiO
2
catalyst
achieved
high
conversion
(85.1
%)
selectivity
(81.0
towards
fuels
lubricant
oils
tandem
process
combining
polyethylene
(PE)
methanol
APR.
By
tuning
metal
loading,
we
identified
Pt
enhances
APR,
while
Ru
drives
C−C
bond
cleavage,
which
is
crucial
PE
hydrogenolysis.
Isotope
labeling
analysis
confirmed
from
APR
effectively
utilized
reaction.
method
was
also
successfully
applied
post‐consumer
polyolefin
waste,
with
toward
valuable
products
ranging
75.0
%
88.9
%.
highlights
an
innovative
strategy
reduce
reliance
fossil‐fuel‐derived
depolymerization,
promoting
both
sustainability
environmental
protection.
Angewandte Chemie International Edition,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 22, 2025
Depolymerizing
plastic
waste
through
hydrogen-based
processes,
such
as
hydrogenolysis
and
hydrocracking,
presents
a
promising
solution
for
converting
plastics
into
liquid
fuels.
However,
conventional
hydrogen
production
methods
rely
heavily
on
fossil
fuels,
exacerbating
global
warming.
This
study
introduces
novel
approach
to
that
utilizes
in
situ
generated
via
the
aqueous
phase
reforming
(APR)
of
methanol,
biomass-derived
chemical
offering
more
sustainable
alternative.
Our
results
show
bimetallic
Ru-Pt/TiO2
catalyst
achieved
high
conversion
(85.1
%)
selectivity
(81.0
towards
fuels
lubricant
oils
tandem
process
combining
polyethylene
(PE)
methanol
APR.
By
tuning
metal
loading,
we
identified
Pt
enhances
APR,
while
Ru
drives
C-C
bond
cleavage,
which
is
crucial
PE
hydrogenolysis.
Isotope
labeling
analysis
confirmed
from
APR
effectively
utilized
reaction.
method
was
also
successfully
applied
post-consumer
polyolefin
waste,
with
toward
valuable
products
ranging
75.0
%
88.9
%.
highlights
an
innovative
strategy
reduce
reliance
fossil-fuel-derived
depolymerization,
promoting
both
sustainability
environmental
protection.
