Nano Letters,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 13, 2025
Ruthenium
(Ru)-based
catalysts
are
active
in
catalyzing
polyethylene
(PE)
upcycling,
but
their
tendency
for
methanation
devalues
the
process.
Although
previous
works
confirmed
that
regulation
of
Ru
structure
can
inhibit
methane
yields,
mechanism
is
still
unclear,
and
catalytic
performance
remains
higher
upside
potential.
Herein,
we
synthesized
M-Ru/H-ZSM-5
(M
=
Pt,
Pd,
Rh)
PE
upcycling.
Pt-Ru/H-ZSM-5
had
better
conversion
(84.36%)
liquid
fuel
selectivity
(78.38%)
extremely
low
(8.43%),
which
be
ascribed
to
its
more
electron-deficient
Ruδ+
species
synergistic
effect
induced
by
Pt
doping.
Through
density
functional
theory
calculations,
nature
inhibition
was
uncovered
reaction
pathway
proposed.
Furthermore,
catalyst
demonstrated
stability
reusability,
as
well
efficacy
upcycling
various
PEs.
This
work
reveals
Ru-based
reactions,
promoting
plastic
recycling
development.
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: Oct. 4, 2022
Plastic
degradation
by
biological
systems
with
re-utilization
of
the
by-products
could
be
a
future
solution
to
global
threat
plastic
waste
accumulation.
Here,
we
report
that
saliva
Galleria
mellonella
larvae
(wax
worms)
is
capable
oxidizing
and
depolymerizing
polyethylene
(PE),
one
most
produced
sturdy
polyolefin-derived
plastics.
This
effect
achieved
after
few
hours'
exposure
at
room
temperature
under
physiological
conditions
(neutral
pH).
The
wax
worm
can
overcome
bottleneck
step
in
PE
biodegradation,
namely
initial
oxidation
step.
Within
saliva,
identify
two
enzymes,
belonging
phenol
oxidase
family,
reproduce
same
effect.
To
best
our
knowledge,
these
enzymes
are
first
animal
this
capability,
opening
way
potential
solutions
for
management
through
bio-recycling/up-cycling.
ACS Catalysis,
Journal Year:
2022,
Volume and Issue:
12(24), P. 14882 - 14901
Published: Nov. 23, 2022
Polyolefins,
the
largest
used
commodity
plastics
in
world,
find
extensive
application
many
fields.
However,
most
end
up
landfills
or
incineration,
leading
to
severe
ecological
crises,
environmental
pollution,
and
serious
resource
waste
problems.
As
representatives
on
chemical
upcycling
of
polyolefin
fuels
bulk/fine
chemicals,
catalytic
cracking
hydrocracking
based
zeolite
metal/zeolite
composite
catalysts
are
considered
effective
paths
due
their
large
capacity
strong
adaptability
existing
petrochemical
equipment.
After
an
overview
reaction
mechanisms
pyrolysis
cracking,
this
review
aims
comprehensively
discuss
influence
catalyst
structure
(acidity,
pore
structure,
morphology)
activity,
selectivity,
stability
particularly
emphasizing
importance
for
matching
acidity
target
product
formation.
Subsequently,
structure–activity
relationship
between
metal
site
zeolite's
acid
is
also
discussed.
In
end,
emerging
opportunities
challenges
proposed
promote
a
more
efficient
way
upcycling.
Case Studies in Chemical and Environmental Engineering,
Journal Year:
2024,
Volume and Issue:
9, P. 100673 - 100673
Published: Feb. 23, 2024
It
is
difficult
to
reuse
wastes
from
polymers
due
the
mismatch
between
amount
of
contaminants
and
secondary
quality
feed.
This
type
operation
much
more
expensive
cost-effective
than
production
polymer
raw
materials
latest
materials.
However,
recyclable
beneficial
if
used
extensively
in
various
concrete
products
wood-polymer
boards.
done
only
cleaning
sorting
are
not
particularly
important
for
products.
Polyethylene
terephthalate
(PET)
a
widely
industries
its
excellent
physical
chemical
properties.
Besides,
increasing
use
PET
has
led
global
crisis
waste
management,
as
improper
disposal
caused
significant
environmental
damage.
major
source
accumulated
landfills,
address
this
issue,
recycling
methods
have
evolved.
In
regard,
present
review
examines
techniques
involved
PET.
Conventional
influence
diverse
depolymerization
reaction
variables
were
discussed,
upsides
downsides
each
technique
considered.
The
summarizes
advances
technologies
plastic
waste,
focusing
on
bio-recycling
PET,
aiming
sustainable,
economical
solutions
circular
economy.
RSC Advances,
Journal Year:
2022,
Volume and Issue:
12(49), P. 31564 - 31576
Published: Jan. 1, 2022
PET
(polyethylene
terephthalate)
has
good
transparency,
corrosion
resistance,
gas
barrier
properties
and
mechanical
properties,
is
widely
used
in
beverage
bottles,
fabrics,
food
packaging,
tires,
films,
engineering
plastics
other
fields.
Chemical Society Reviews,
Journal Year:
2023,
Volume and Issue:
52(14), P. 4755 - 4832
Published: Jan. 1, 2023
Diversification
of
polymer
waste
recycling
is
one
the
solutions
to
improve
current
environmental
scenario.
Upcycling
a
promising
strategy
for
converting
into
molecular
intermediates
and
high-value
products.
Although
catalytic
transformations
small
molecules
have
been
actively
discussed,
methods
characteristics
upcycling
new
materials
not
yet
addressed.
Recently,
functionalisation
wastes
(polyethylene
terephthalate
bottles,
polypropylene
surgical
masks,
rubber
tires,
etc.)
their
conversion
with
enhanced
functionality
proposed
as
an
appealing
alternative
dealing
recycling/treatment.
In
this
review,
term
'functional
upcycling'
introduced
designate
any
method
post-polymerisation
modification
or
surface
without
considerable
chain
destruction
produce
upcycled
material
added
value.
This
review
explores
functional
detailed
consideration
most
common
polymers,
i.e.,
polystyrene,
poly(methyl
methacrylate),
polyethylene,
polypropylene,
polyurethane,
polyethylene
terephthalate,
polyvinyl
chloride,
polycarbonate,
rubber.
We
discuss
composition
plastic
waste,
reactivity,
available
physical/chemical
agents
modification,
interconnection
between
properties
application.
To
date,
successfully
applied
adsorbents
(including
CO2),
catalysts,
electrode
energy
storage
sensing,
demonstrating
high
Importantly,
reviewed
reports
indicated
that
specific
performance
generally
comparable
higher
than
similar
prepared
from
virgin
feedstock.
All
these
advantages
promote
diversification
approach
against
postprocessing
employed
waste.
Finally,
identify
limitations
suggest
future
scope
research
each
polymer,
we
comparatively
analysed
aspects
those
chemical
mechanical
recycling,
considering
resource
costs,
toxicity
used
chemicals,
footprint,
value
product.
Green Chemistry,
Journal Year:
2023,
Volume and Issue:
25(18), P. 6949 - 6970
Published: Jan. 1, 2023
This
review
summarizes
the
emerging
advanced
technologies
including
bio-,
photo-,
electro-,
and
low-temperature
thermocatalysis
for
recycling
upgrading
of
waste
plastics
under
mild
conditions.
