Cell Reports Physical Science,
Journal Year:
2024,
Volume and Issue:
5(7), P. 102075 - 102075
Published: July 1, 2024
Plastics,
integral
to
modern
life
since
their
inception,
pervade
our
daily
existence.
However,
conventional
approaches
managing
plastic
waste,
especially
polyolefin
pose
significant
challenges
resources
and
the
environment.
Recent
years
have
witnessed
remarkable
advancements
in
realm
of
waste
management
through
traditional
heterogeneous
catalysis
pathways,
notably
under
mild
conditions
such
as
hydrocracking,
hydrogenolysis,
metathesis.
In
this
comprehensive
review,
we
offer
a
systematic
overview
spanning
catalyst
development
process
design
engineering.
We
intricately
compare
various
reaction
routes,
elucidate
mechanisms,
rigorously
evaluate
processes.
Additionally,
present
insights
into
future
directions
for
both
academic
research
industrial
recycling
via
routes
at
conditions.
ChemCatChem,
Journal Year:
2023,
Volume and Issue:
15(13)
Published: March 29, 2023
Abstract
Polyolefins
and
especially
polyethylenes
(LLDPE,
LDPE
HDPE)
polypropylene
(PP)
contribute
a
great
deal
to
the
growing
amounts
of
plastic
waste
with
combined
production
share
almost
50
%
by
mass.
While
being
universally
applicable,
they
are
mainly
used
for
short‐lived
packaging
materials
that
constitute
over
60
annual
post‐consumer
waste.
Thus,
disproportionately
high
polyolefins
end
up
as
(PCW)
management
strategies
these
particularly
inert
plastics
needed.
This
necessity
has
promoted
research
effort
dealing
valorization
discarded
but,
nevertheless,
valuable
materials.
review
aims
highlight
scientific
advances
made
in
chemical
polyolefin
recycling
recent
years,
focusing,
though
not
exclusively,
on
catalytic
processes
recycle
various
means
at
more
moderate
temperatures
compared
pyrolysis
such
deconstructing
polymer
objective
upcycling
mind
or
transformation
give
access
functional
chemicals.
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(16), P. 9457 - 9579
Published: Aug. 16, 2024
The
large
production
volumes
of
commodity
polyolefins
(specifically,
polyethylene,
polypropylene,
polystyrene,
and
poly(vinyl
chloride)),
in
conjunction
with
their
low
unit
values
multitude
short-term
uses,
have
resulted
a
significant
pressing
waste
management
challenge.
Only
small
fraction
these
is
currently
mechanically
recycled,
the
rest
being
incinerated,
accumulating
landfills,
or
leaking
into
natural
environment.
Since
are
energy-rich
materials,
there
considerable
interest
recouping
some
chemical
value
while
simultaneously
motivating
more
responsible
end-of-life
management.
An
emerging
strategy
catalytic
depolymerization,
which
portion
C-C
bonds
polyolefin
backbone
broken
assistance
catalyst
and,
cases,
additional
molecule
reagents.
When
products
molecules
materials
higher
own
right,
as
feedstocks,
process
called
upcycling.
This
review
summarizes
recent
progress
for
four
major
upcycling
strategies:
hydrogenolysis,
(hydro)cracking,
tandem
processes
involving
metathesis,
selective
oxidation.
Key
considerations
include
macromolecular
reaction
mechanisms
relative
to
mechanisms,
design
transformations,
effect
conditions
on
product
selectivity.
Metrics
describing
critically
evaluated,
an
outlook
future
advances
described.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(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.
Catalysis Science & Technology,
Journal Year:
2022,
Volume and Issue:
13(5), P. 1258 - 1280
Published: Dec. 15, 2022
This
review
provides
an
overview
of
catalytic
hydroconversion
processes
including
hydrocracking,
hydrogenolysis
and
hydrodeoxygenation
for
upcycling
plastic
wastes
into
fuels
valuable
chemicals.
