Science for energy and environment.,
Год журнала:
2025,
Номер
unknown, С. 4 - 4
Опубликована: Март 27, 2025
Review
Upcycling
of
Waste
Plastics
into
Value-Added
Chemicals
Jin
Xu
and
Jing
Zhang
*
State
Key
Laboratory
Chemical
Engineering,
East
China
University
Science
Technology,
130
Meilong
Road,
Shanghai
200237,
Correspondence:
[email protected]
Received:
8
November
2024;
Revised:
22
January
2025;
Accepted:
24
March
Published:
27
2025
Abstract:
The
rapid
increase
in
plastic
production
has
led
to
a
severe
waste
crisis,
driving
the
development
various
recycling
technologies
mitigate
this
growing
issue.
However,
these
often
encounter
substantial
economic
environmental
challenges
their
implementation.
An
increasingly
attractive
alternative
is
chemical
upcycling,
which
can
transform
plastics
value-added
chemicals.
This
review
systematically
examines
upcycling
applicable
major
commercial
plastics,
including
polyethylene
terephthalate
(PET),
polyolefins,
polystyrene
(PS),
polyvinyl
chloride
(PVC).
We
focus
on
key
strategies
such
as
solvolysis,
catalytic
pyrolysis,
hydrocracking
hydrogenolysis,
along
with
some
emerging
approaches
electrocatalysis
photooxidation,
aiming
summarize
trends
plastics.
Catalysts,
Год журнала:
2024,
Номер
14(7), С. 450 - 450
Опубликована: Июль 12, 2024
The
extensive
use
of
plastics
has
led
to
a
significant
environmental
threat
due
the
generation
waste
plastic,
which
shown
challenges
during
recycling.
catalytic
hydrocracking
route,
however,
is
viewed
as
key
strategy
manage
this
fossil-fuel-derived
into
plastic-derived
fuels
with
lower
carbon
emissions.
Despite
numerous
efforts
identify
an
effective
bi-functional
catalyst,
especially
metal-loaded
zeolites,
high-performing
zeolite
for
yet
be
synthesized.
This
microporous
nature
zeolite,
results
in
diffusional
limitations
bulkier
polymer
molecules
entering
structure
and
reducing
overall
cracking
plastic
catalyst
cycle
time.
These
constraints
can
overcome
by
developing
hierarchical
zeolites
that
feature
shorter
diffusion
paths
larger
pore
sizes,
facilitating
movement
bulky
molecules.
However,
if
modification
process
not
controlled,
it
lead
synthesis
compromised
functionality
or
structural
integrity,
resulting
reduced
conversion
plastics.
Therefore,
we
provide
overview
various
methods
synthesizing
emphasizing
advancements
over
past
two
decades
innovative
strategies
introduce
additional
systems.
objective
review
study
approaches
based
on
their
effectiveness
while
clear
link
between
optimized
preparation
structure-activity
relationship
used
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Март 21, 2025
Abstract
Upcycling
waste
plastics
into
liquid
fuels
presents
significant
potential
for
advancing
the
circular
economy
but
is
hindered
by
poor
selectivity
and
low-value
methane
byproduct
formation.
In
this
work,
we
report
that
atomic
Ru-doped
ZrO
2
can
selectively
convert
100
grams
of
post-consumer
polyethylene
polypropylene,
yielding
85
mL
in
a
solvent-free
hydrocracking.
The
(C
5
-C
20
)
comprises
~70%
jet-fuel-ranged
branched
hydrocarbons
8
16
),
while
gas
product
liquefied-petroleum-gas
3
6
without
ethane.
We
found
Ru
dopant
Ru-O-Zr
moiety
functionalizes
its
neighboring
O
atom,
originally
inert,
to
create
Brønsted
acid
site.
This
site,
rather
than
itself,
governs
internal
C−C
bond
cleavage
polyolefins
through
carbonium
ion
mechanism,
thereby
enhancing
yield
suppressing
oxide
modulation
strategy
provides
paradigm
shift
catalyst
design
hydrocracking
holds
broad
spectrum
applications.
JACS Au,
Год журнала:
2024,
Номер
4(11), С. 4361 - 4373
Опубликована: Окт. 11, 2024
The
chemical
upcycling
of
plastic
wastes
by
converting
them
into
valuable
fuels
and
chemicals
represents
a
sustainable
approach
as
opposed
to
landfilling
incineration.
However,
it
encounters
challenges
in
dealing
with
mixed
due
their
complex
composition
sorting/cleaning
costs.
Here,
we
present
one-pot
hydrodeoxygenation
(HDO)
method
for
containing
poly(ethylene
terephthalate)
(PET),
polycarbonate
(PC),
poly(phenylene
oxide)
(PPO)
naphthenes
under
mild
reaction
conditions.
To
facilitate
this
process,
developed
cost-effective,
contaminant-tolerant,
reusable
Ni/HZSM-5
bifunctional
catalyst
through
an
ethylene
glycol-assisted
impregnation
method.
metallic
Ni
site
plays
pivotal
role
catalyzing
C-O
C-C
cleavages
well
hydrogenation
reactions,
while
the
acidic
HZSM-5
facilitates
dehydration
isomerization
reactions.
collaboration
between
metal
acid
dual
sites
on
enabled
efficient
HDO
wide
range
substrates,
including
bottles,
textile
fibers,
pellets,
sheets,
CDs/DVDs,
plastics
without
cleaning
or
pigments
removal
even
various
mixtures,
high
yield
up
99%
at
250
°C
4
MPa
H
