Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 2, 2025
Abstract
Plastic
products
bring
convenience
to
various
aspects
of
the
daily
lives
due
their
lightweight,
durability
and
versatility,
but
massive
accumulation
post‐consumer
plastic
waste
is
posing
significant
environmental
challenges.
Catalytic
methods
can
effectively
convert
into
value‐added
feedstocks,
with
catalysts
playing
an
important
role
in
regulating
yield
selectivity
products.
This
review
explores
latest
advancements
advanced
applied
thermal
catalysis,
microwave‐assisted
photocatalysis,
electrocatalysis,
enzymatic
catalysis
reaction
systems
for
chemical
recycling
valuable
feedstocks.
Specifically,
pathways
mechanisms
involved
plastics
process
are
analyzed
presented,
strengths
weaknesses
employed
across
different
described.
In
addition,
structure‐function
relationship
these
discussed.
Herein,
it
provided
insights
design
novel
outline
challenges
future
opportunities
terms
developing
tackle
“white
pollution”
crisis.
Science Advances,
Journal Year:
2023,
Volume and Issue:
9(25)
Published: June 21, 2023
One-step
conversion
of
low-purity
polyolefins
to
value-added
products
without
pretreatments
represents
a
great
opportunity
for
chemical
recycling
waste
plastics.
However,
additives,
contaminants,
and
heteroatom-linking
polymers
tend
be
incompatible
with
catalysts
that
break
down
polyolefins.
Here,
we
disclose
reusable,
noble
metal-free
impurity-tolerant
bifunctional
catalyst,
MoSx-Hbeta,
hydroconversion
into
branched
liquid
alkanes
under
mild
conditions.
The
catalyst
works
wide
scope
polyolefins,
including
different
kinds
high-molecular
weight
mixed
various
polymers,
contaminated
postconsumer
with/without
cleaning
250°C
20
30
bar
H2
in
6
12
hours.
A
96%
yield
small
was
successfully
achieved
even
at
temperature
as
low
180°C.
These
results
demonstrate
the
potentials
practical
use
plastics
largely
untapped
carbon
feedstock.
Chemical Science,
Journal Year:
2023,
Volume and Issue:
14(37), P. 10068 - 10080
Published: Jan. 1, 2023
Catalytic
cracking
could
enable
low
temperature
conversion
of
hard-to
recycle
polyolefin
plastics.
However,
traditional
catalysts
suffer
from
macro
and
microscopic
mass
transport
limitations,
which
call
for
plastic
pre-treatment.
Langmuir,
Journal Year:
2024,
Volume and Issue:
40(10), P. 5077 - 5089
Published: Feb. 15, 2024
Plastics
with
an
inert
carbon–carbon
(C–C)
backbone,
such
as
polyethylene
(PE),
polypropylene
(PP),
polystyrene
(PS),
and
polyvinyl
chloride
(PVC),
are
the
most
widely
used
types
of
plastic
in
human
activities.
However,
many
these
polymers
were
directly
discarded
nature
after
use,
few
appropriately
recycled.
This
not
only
threatens
natural
environment
but
also
leads
to
waste
carbon
resources.
Conventional
chemical
recycling
plastics,
including
pyrolysis
catalytic
cracking,
requires
a
high
energy
input
due
inertness
C–C
bonds
C–H
complex
product
distribution.
In
recent
years,
significant
progress
has
been
made
development
catalysts
introduction
small
molecules
additional
coreactants,
which
could
potentially
overcome
challenges.
this
Review,
we
summarize
highlight
strategies
that
address
issues
upcycling
backbone
plastics
molecules,
particularly
heterogeneous
catalysis.
We
believe
review
will
inspire
methods
for
using
TrAC Trends in Analytical Chemistry,
Journal Year:
2024,
Volume and Issue:
173, P. 117631 - 117631
Published: March 5, 2024
The
pervasive
presence
of
plastics
in
the
environment,
particularly
microplastics,
has
become
a
significant
global
challenge,
demanding
innovative
solutions
for
their
management
and
upcycling.
While
traditional
methods
including
landfill
incineration
face
limitations
environmental
impact,
emerging
technologies
offer
promising
pathways
conversion
into
valuable
chemicals
fuels,
operating
under
ambient
conditions
often
utilizing
sustainable
energy
sources.
Considering
current
research
progress
plastic
upgrading,
it
is
necessary
to
summarize
chemical
upcycling
waste.
To
this
end,
review
provides
an
overall
examination
methodologies
treatment,
pyrolysis,
hydrogenolysis,
photocatalysis,
electrocatalysis.
Existing
knowledge
gaps
future
directions
are
then
proposed.
Overall,
highlights
potential
these
novel
approaches
aligning
with
principles
circular
economy.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(8)
Published: Jan. 6, 2024
Abstract
Hydrocracking
catalysis
is
a
key
route
to
plastic
waste
upgrading,
but
the
acid
site‐driven
C−C
cleavage
step
relatively
sluggish
in
conventional
bifunctional
catalysts,
dramatically
effecting
overall
efficiency.
We
demonstrate
here
facile
and
efficient
way
boost
reactivity
of
sites
by
introducing
Ce
promoters
into
Pt/HY
thus
achieving
better
metal‐acid
balance.
Remarkably,
100
%
low‐density
polyethylene
(LDPE)
can
be
converted
with
80.9
selectivity
liquid
fuels
over
obtained
Pt/5Ce‐HY
catalysts
at
300
°C
2
h.
For
comparison,
only
gives
38.8
LDPE
conversion
21.3
fuels.
Through
multiple
experimental
studies
on
structure‐performance
relationship,
species
occupied
supercage
are
identified
as
actual
active
sites,
which
possess
remarkably‐improved
adsorption
capability
towards
short‐chain
intermediates.
Science Advances,
Journal Year:
2024,
Volume and Issue:
10(15)
Published: April 12, 2024
Zeolite-catalyzed
polyethylene
(PE)
aromatization
achieves
reduction
of
the
aromatic
yield
via
hydrogenation
and
hydrogenolysis
reactions.
The
hydrogen
required
for
CO
2
can
be
provided
by
H
radicals
formed
during
aromatization.
In
this
study,
we
efficiently
convert
PE
into
aromatics
using
a
zeolite–metal
oxide
catalyst
(HZSM-5
+
CuZnZrO
x
)
at
380°C
under
hydrogen-
solvent-free
reaction
conditions.
Hydrogen,
derived
from
over
HZSM-5,
diffuses
through
Brønsted
acidic
sites
zeolite
to
adjacent
,
where
it
is
captured
in
situ
produce
bicarbonate
further
hydrogenated
CO.
This
favors
while
inhibiting
secondary
An
62.5
wt
%
achieved,
which
60%
consisted
benzene,
toluene,
xylene
(BTX).
conversion
reaches
values
as
high
0.55
mmol
g
−1
.
aromatization–hydrogen
capture
pathway
provides
feasible
scheme
comprehensive
utilization
waste
plastics
Applied Catalysis A General,
Journal Year:
2024,
Volume and Issue:
685, P. 119873 - 119873
Published: July 8, 2024
This
study
highlights
novel,
energy-efficient,
environmentally
friendly
and
less
time-consuming
methods
to
dealuminate
zeolites,
by
forced
convective
steaming
use
of
molecular
CO2.
Zeolites
with
comparable
(or
superior)
physicochemical
properties
than
those
traditional
dealumination
techniques
were
produced.
All
dealuminated
zeolites
tested
for
the
hydrocracking
high-density
polyethylene,
showing
considerably
high
activity
selectivity
lighter
oils,
particularly
gasoline.
The
steamed
zeolite
revealed
be
best,
given
its
number
silanol
groups,
acidity
porosity,
lower
environmental
impact.
Furthermore,
bi-functional
Ni-loaded
showed
good
stability
ability
regenerated.
Therefore,
it
is
possible
generate
hierarchical
catalytic
their
rival
technologies,
following
green
chemistry
metrics.
Given
relevance
in
sustainable
routes
produce
chemicals
fuels,
potential
application
these
newly
developed
catalysts
highly
promising
vast.
Journal of Hazardous Materials Advances,
Journal Year:
2024,
Volume and Issue:
16, P. 100460 - 100460
Published: Aug. 31, 2024
Microplastics,
small
sized
plastic
particles
having
size
<5
mm
are
formed
through
primary
process
including
production
of
beauty
products,
microbeads
and
microfibres
as
well
secondary
mechanical
weathering,
friction,
aberration
fragmentation
large
plastics.
The
major
sources
microplastics
land-based
ocean-based
sources.
Microplastic
pollution
is
a
serious
concern
due
to
the
persistent,
low
biodegradability
bio-accumulative
behaviour.
Microplastics
can
bioaccumulate
in
food
chain
cause
ecological
human
health
risk.
Hence,
it
important
remove
from
aquatic
ecosystems.
removed
systems
wastewater
series
processes
such
physical,
chemical
biological
treatments.
In
present
articles,
>250
articles
reviewed
collect
information
regarding
various
methods
for
removal
microplastics.
Also,
probable
control
strategies
combat
with
were
assessed.
It
was
concluded
that
recent
water
treatment
efficient
removing
microplastic
pollution.
efficiencies
ranged
between
74
%-99.2
%,
65
%-99.20
%
77
%-100
methods,
respectively.
Among
three
physical
especially
filtration
biochar
most
way
(efficiency
up
100
%)
also
creating
public
awareness,
promoting
reusing,
recycling
reducing,
application
bioplastics
wastes.
This
review
will
be
useful
add
current
knowledge
abatement
pollution,
finding
novel
solution
help
policymakers
implement
effective
cost-efficient
method
microplastics,
find
out
new
reduce,
reuse
recycle
