Reaction Chemistry & Engineering,
Journal Year:
2021,
Volume and Issue:
7(1), P. 41 - 54
Published: Dec. 1, 2021
A
direct
comparison
of
the
recent
advancements
in
hydrogenolysis
and
hydrocracking
polyolefins
is
lacking.
This
perspective
aims
to
address
this
gap
while
providing
insights
from
model
alkane
studies
guide
future
research.
Chemical Reviews,
Journal Year:
2023,
Volume and Issue:
123(9), P. 5612 - 5701
Published: March 14, 2023
Plastics
are
everywhere
in
our
modern
way
of
living,
and
their
production
keeps
increasing
every
year,
causing
major
environmental
concerns.
Nowadays,
the
end-of-life
management
involves
accumulation
landfills,
incineration,
recycling
to
a
lower
extent.
This
ecological
threat
environment
is
inspiring
alternative
bio-based
solutions
for
plastic
waste
treatment
toward
circular
economy.
Over
past
decade,
considerable
efforts
have
been
made
degrade
commodity
plastics
using
biocatalytic
approaches.
Here,
we
provide
comprehensive
review
on
recent
advances
enzyme-based
biocatalysis
design
related
processes
recycle
or
upcycle
plastics,
including
polyesters,
polyamides,
polyurethanes,
polyolefins.
We
also
discuss
scope
limitations,
challenges,
opportunities
this
field
research.
An
important
message
from
that
polymer-assimilating
enzymes
very
likely
part
solution
reaching
ACS Sustainable Chemistry & Engineering,
Journal Year:
2021,
Volume and Issue:
9(35), P. 11661 - 11666
Published: July 27, 2021
Catalytic
depolymerization
of
polyolefins
is
a
promising
chemical
recycling
strategy
to
create
value-added
products
from
waste
plastics,
which
are
accumulating
in
landfills
and
the
natural
environment
at
unsustainable
rates.
The
cleavage
strong
C–C
bonds
can
be
performed
using
noble
metal
hydrogen
via
hydrogenolysis
mechanism.
Previously,
we
identified
ruthenium
nanoparticles
supported
on
carbon
(Ru/C)
as
highly
active
heterogeneous
catalyst
for
conversion
polyethylene
into
liquid
gaseous
n-alkanes
under
mild
conditions.
In
present
study,
investigated
catalytic
polypropylene
(PP)
conditions
(200–250
°C,
20–50
bar
H2).
We
demonstrate
that
Ru/C
produces
C5–C32
iso-alkane
yields
above
68%
absence
solvent
identify
trade-offs
between
product
yield
temperature,
pressure,
reaction
time.
apply
rigorous
analytical
method
quantify
all
alkane
products.
characterized
was
found
recyclable
after
complete
high
molecular
weight
PP
(Mw
∼
340,000
Da)
hydrocarbons
postconsumer
centrifuge
tube.
Further,
shown
effective
depolymerizing
mixture
high-density
produce
linear
branched
alkanes,
demonstrating
feasibility
streams
mixed
polyolefin
waste.
ACS Catalysis,
Journal Year:
2022,
Volume and Issue:
12(11), P. 6722 - 6728
Published: May 23, 2022
The
electro-reforming
of
polymer
plastic
waste
and
CO2
has
the
merits
for
producing
value-added
chemicals
alleviating
environmental
pollution.
Herein,
we
report
an
electrocatalytic
integrating
strategy
efficient
valorization
poly(ethylene
terephthalate)
(PET)
to
simultaneously
produce
formic
acid
at
both
anode
cathode.
NiCo2O4
electrocatalyst
displays
a
high
Faradaic
efficiency
90%
production,
which
indicates
excellent
selectivity
PET
hydrolysate
oxidation.
By
coupling
oxidation
reaction
with
reduction
reaction,
assembled
electrolyzer
exhibits
low
cell
voltage
1.55
V
drive
integrated
two
half-reactions.
Furthermore,
155%
can
be
achieved
1.90
V.
This
study
suggests
that
could
energy-efficient
economically
viable
realize
production
chemicals.
Advanced Energy Materials,
Journal Year:
2022,
Volume and Issue:
12(22)
Published: April 21, 2022
Abstract
Plastic
waste
remains
a
global
challenge
due
to
the
massive
amounts
being
produced
without
satisfactory
treatment
technologies
for
recycling
and
upcycling.
Photocatalytic
processes
are
emerging
as
green
promising
approaches
upcycle
plastics
into
value‐added
products
under
mild
conditions
using
sunlight
energy
source.
In
this
review,
recent
advances
in
plastic
conversion
through
photocatalysis
have
been
comprehensively
summarized.
Special
emphasis
is
placed
on
photocatalytic
mechanism
selective
CC
CH
bond
transformations
of
access
fuels,
chemicals,
materials.
Finally,
challenges
perspectives
establishing
new
paradigm
toward
sustainable
circular
economy
also
put
forward.
ACS Catalysis,
Journal Year:
2022,
Volume and Issue:
12(15), P. 9307 - 9324
Published: July 18, 2022
Plastic
waste
triggers
a
series
of
concerns
because
its
disruptive
impact
on
the
environment
and
ecosystem.
From
point
view
catalysis,
however,
end-of-life
plastics
can
be
seen
as
an
untapped
feedstock
for
preparation
value-added
products.
Thus,
development
diversified
catalytic
approaches
valorization
is
urgent.
Previous
reviews
this
field
have
systematically
summarized
progress
made
plastic
reclamation.
In
review,
we
emphasize
design
processes
by
leveraging
state-of-the-art
technologies
from
other
developed
fields
to
derive
valuable
polymers,
functional
materials,
chemicals
plastics.
The
principles,
mechanisms,
opportunities
chemical
(thermo-,
electro-,
photocatalytic)
well
biocatalytic
ones
are
discussed,
which
may
provide
more
insights
future
processes.
Finally,
outlooks
perspectives
accelerate
toward
feasible
economy
discussed.
Materials,
Journal Year:
2021,
Volume and Issue:
14(17), P. 4782 - 4782
Published: Aug. 24, 2021
Today,
the
scientific
community
is
facing
crucial
challenges
in
delivering
a
healthier
world
for
future
generations.
Among
these,
quest
circular
and
sustainable
approaches
plastic
recycling
one
of
most
demanding
several
reasons.
Indeed,
massive
use
materials
over
last
century
has
generated
large
amounts
long-lasting
waste,
which,
much
time,
not
been
object
adequate
recovery
disposal
politics.
Most
this
waste
by
packaging
materials.
Nevertheless,
decade,
new
trend
imposed
environmental
concerns
brought
topic
under
magnifying
glass,
as
testified
increasing
number
related
publications.
Several
methods
have
proposed
polymeric
based
on
chemical
or
mechanical
methods.
A
panorama
promising
studies
to
polyethylene
(PE),
polypropylene
(PP),
terephthalate
(PET),
polystyrene
(PS)
given
within
review.
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.