Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 21, 2024
Chemical
conversion
has
emerged
as
an
effective
approach
for
disposing
waste
plastics;
however,
the
product
diversity
in
traditional
methods
leads
to
pressing
challenges
separation
and
purification.
As
a
pioneering
advancement,
comprehensive
transformation
of
plastics
into
CH4
presents
attractive
prospect:
directly
yielding
high-purity
products.
Significantly,
is
important
hydrogen
carrier
industrial
feedstock.
However,
there
still
much
room
enhancing
overall
efficiency.
Herein,
we
show
new
strategy
construct
high-efficiency
robust
polyethylene
(PE)
upgrading
catalyst
by
codoping
Mn
heteroatoms
both
RuO2
CeO2.
We
found
that
these
effectively
bolster
stability
Ruδ+
species
under
high-temperature
reduction
conditions.
The
harmonious
coexistence
Ru0
significantly
refines
reaction
pathway
adsorption
alkane
intermediates.
Consequently,
achieved
impressive
PE
rate
exceeding
>99%
with
nearly
99%
toward
at
moderate
temperature
250
°C
within
8
h.
Our
discovery
not
only
opens
window
but
also
exciting
opportunities
in-depth
complex,
fine
chemicals
through
methane-mediated
catalysis.
Chemical Reviews,
Год журнала:
2024,
Номер
124(16), С. 9457 - 9579
Опубликована: Авг. 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.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Фев. 18, 2025
7
billion
of
9.2
tons
plastic
produced
becomes
waste
while
conventional
catalytic
recycling
methods
are
vulnerable
with
degraded
performance
and
intensive
energy
input.
Here,
a
hybrid
Zn/b-ZnO
catalyst,
together
the
specially-designed
microwave
reaction
system,
has
achieved
fast
upgrading
under
atmospheric
pressure
without
using
H2.
Bifunctional
ZnO
acts
as
absorber
substrate
in-situ
formed
Zn
clusters
promote
C-C
bond
cleavage
nearly
100%
upcycle
landfilled
mixtures
into
lubricant
base
oil
precursors
monomers.
Unprecedented
turnover
number
(250
gplastic
g−1catalyst)
depolymerisation
long-time
stability
over
50
successive
cycles
have
been
demonstrated,
8-time
higher
efficiency
compared
catalysis,
indicating
this
strategy
is
an
economical
approach
to
efficient
upcycling
plastics
towards
valuable
products.
Moreover,
catalyst
can
tolerate
high
contaminates,
even
still
be
converted
precursors,
which
never
reported
before.
Traditional
for
often
suffer
from
reduced
demands.
authors
demonstrate
highly
rapid
process
depolymerizing
monomers
microwave-assisted
catalysis
mild
conditions.
Giant,
Год журнала:
2024,
Номер
19, С. 100307 - 100307
Опубликована: Июнь 14, 2024
Polyolefins
are
the
most
produced
and
widely
used
polymeric
materials.
However,
chemically
inert
nature
of
polyolefins
has
led
to
severe
environmental
pollution,
posing
a
threat
human
sustenance
development.
Managing
recycling
polyolefin
plastic
waste
is
crucial
for
transition
from
linear
sustainable
circular
economy.
Catalytic
chemical
includes
traditional
techniques
like
pyrolysis
photolysis,
innovative
methods
that
introduce
cleavable
bonds
into
chain
closed-loop
recycling.
post-functionalization
post-consumer
materials
another
strategy
tackle
waste,
aiming
upgrade
materials'
utility
contribute
sustainability.
Overall,
developing
catalytic
deconstructing
upcycling
plastics
essential
encourage
better
reclamation
practices
reduce
impact
waste.
ACS Catalysis,
Год журнала:
2024,
Номер
14(16), С. 12437 - 12453
Опубликована: Авг. 5, 2024
Synthetic
polymers
play
an
indispensable
role
in
modern
society,
finding
applications
across
various
sectors
ranging
from
packaging,
textiles,
and
consumer
products
to
construction,
electronics,
industrial
machinery.
Commodity
plastics
are
cheap
produce,
widely
available,
versatile
meet
diverse
application
needs.
As
a
result,
millions
of
metric
tons
manufactured
annually.
However,
current
approaches
for
the
chemical
recycling
postconsumer
plastic
waste,
primarily
based
on
pyrolysis,
lag
efficiency
compared
their
production
methods.
In
recent
years,
significant
research
has
focused
developing
milder,
economically
viable
methods
commodity
plastics,
which
involves
converting
waste
back
into
monomers
or
transforming
it
other
valuable
chemicals.
This
Perspective
examines
both
cutting-edge
laboratory-scale
contributing
advancements
field
recycling.
Cell Reports Physical Science,
Год журнала:
2024,
Номер
5(7), С. 102075 - 102075
Опубликована: Июль 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.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 11, 2024
Abstract
In
the
context
of
global
struggle
against
plastics,
catalytic
upgrading
and
recycling
plastics
has
been
subject
considerable
attention
as
a
powerful
strategy
for
achieving
both
environmental
remediation
value‐added
chemical
production.
Compared
with
conventional
methods,
emerging
photothermal
catalysis
methodology
integrates
photochemical
thermal
processes,
which
outstands
features
high
conversion
efficiency
mild
reaction
conditions.
Herein,
comprehensive
review
recent
research
progress
plastic
waste
is
presented.
First,
types
catalysts
upcycling
are
classified
into
three
categories,
metallic
materials,
semiconductor
carbon‐based
based
on
mechanism.
Their
potential
mechanisms
converters
future
directions
in
highlighted.
Furthermore,
logical
structural
design
materials
summarized
to
enhance
performance
conversion.
Finally,
opportunities
challenges
this
promising
but
nascent
field
discussed,
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Дек. 4, 2024
Chemical
recycling
of
plastic
waste
could
reduce
its
environmental
impact
and
create
a
more
sustainable
society.
Hydrogenolysis
is
viable
method
for
polyolefin
valorization
but
typically
requires
high
hydrogen
pressures
to
minimize
methane
production.
Here,
we
circumvent
this
stringent
requirement
using
dilute
RuPt
alloy
suppress
the
undesired
terminal
C–C
scission
under
hydrogen-lean
conditions.
Spectroscopic
studies
reveal
that
PE
adsorption
takes
place
on
both
Ru
Pt
sites,
yet
bond
cleavage
proceeds
faster
site,
which
helps
avoid
successive
in
situ-generated
reactive
intermediates
due
lack
neighboring
site.
Different
from
previous
research,
suppressing
generation
independent
H2
pressure,
can
be
converted
fuels
waxes/lubricant
base
oils
with
only
<3.2%
even
ambient
pressure.
This
advantage
would
allow
integration
distributed,
low-pressure
sources
into
upstream
hydrogenolysis
provide
feasible
solution
decentralized
upcycling.
polyolefins
often
produces
excessive
low
by
alloy,
authors
successfully
prevent
sequential
cleavage,
enabling
flexible
use
various
localized
recycling.
