Reductive Upcycling of Polyolefins, Polyesters and Mixed Plastic Wastes to Valuable Chemicals: Bridging Chemical Catalysis With Plastic Waste Management
Advanced Sustainable Systems,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 20, 2025
Abstract
The
unmatched
applications
of
plastic
commodities
are
evident
from
the
enormous
production,
reaching
over
400
million
tons
per
year
in
recent
times.
Contrastingly,
lack
proper
management
leads
to
a
large
accumulation
waste,
majorly
including
polyolefins
and
polyesters.
Conventional
methods
possess
significant
drawbacks
like
cost‐ineffectiveness
greenhouse
gas
emissions.
Over
last
decade,
chemical
processes
have
shown
promising
potential
for
but
only
hold
0.1%
share
recycling.
catalytic
offer
excellent
protocols
obtain
high‐value
liquid
fuels,
waxes,
chemicals
waste.
This
review
presents
an
elaborate
discussion
on
state
art
reductive
upcycling
polyolefins,
polyesters,
mixed
initially
discusses
alarming
statistics
plastics
conventional
approaches
followed
by
introduction
processes.
Further,
various
recently
reported
strategies
been
elaborated
detail
catalyst
deactivation,
technoeconomic
analysis,
life
cycle
assessment
deeper
understanding
current
this
research
field.
Finally,
detailed
summary
along
with
existing
challenges
countermeasures
is
discussed
open
new
avenues
waste
research.
Language: Английский
Hydrocracking of Polyethylene to Gasoline-Range Hydrocarbons over a Ruthenium-Zeolite Bifunctional Catalyst System with Optimal Synergy of Metal and Acid Sites
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.
Language: Английский