As
plastic
production
and
environmental
accumulation
continues
to
grow,
developing
new
technologies
for
upcycling
wastes
is
critical.
A
chemical
recycling
technology
in
commercial
development
pyrolysis,
which
involves
rapidly
heating
plastics
without
oxygen
present
convert
into
condensable
products
such
as
wax
oil.
These
contain
a
wide
variety
of
chemicals,
some
can
be
used
building
blocks
or
chemicals.
Pyrolysis
has
shown
potential
circular
economy
plastics,
but
scaling
up
pyrolysis
challenging
due
heat
transfer
limitations
typical
reactors.
This
work
advances
thermal
oxo-degradation
(TOD)
an
alternative
conventional
pyrolysis.
TOD
differs
from
the
process
by
introducing
air
reaction.
The
main
benefits
are
increase
rate
depolymerization
waste
provide
enthalpy
reaction
dramatically
impacting
desired
product
yields.
research
defines
separate
regime
gasification,
goal
producing
syngas.
Alternatively,
herein
reported
studies
use
create
energy-dense
products.
Both
virgin
post-consumer
high-density
polyethylene
polypropylene
show
enthalpies
greater
than
2100
J
g-1.
Comparison
showed
that
partial
oxidation
reactions
release
reactor,
helping
manage
endothermic
load
vapor-phase
cracking
reactions.
By
manipulating
variables
temperature,
equivalence
ratio,
vapor
residence
time,
either
majority
oxygenated
molecules
(e.g.
alcohols,
aldehydes,
carboxylic
acids)
hydrocarbon
(paraffins,
olefins,
diolefins).
condensed
waxes
oils.
Oxygenated
sole
carbon
source
bioconversion
yeasts.
Because
oils
resemble
those
produced
hydrocarbon-rich
catalytically
upgraded
light
olefins
reintegration
economy.
shows
applied
technique
overcomes
enabling
easier
scaling.
Applying
help
mitigate
our
landfills
achieve
Results in Engineering,
Год журнала:
2024,
Номер
22, С. 102066 - 102066
Опубликована: Март 31, 2024
The
accumulation
of
plastic
waste
poses
a
major
environmental
challenge,
while
the
conversion
plastics
into
oil
via
pyrolysis
holds
promise
as
an
alternative
energy
solution.
Despite
numerous
investigations
this
area,
none
have
focused
on
optimizing
process
parameters
for
higher
yield
and
enhancing
overall
performance
through
suitable
fuel
modification.
present
study
aims
to
optimize
parameters,
including
heating
rate
(HR),
temperature
(PT),
reaction
time
(RT),
achieve
(WPO)
enhance
by
blending
optimal
quantities
water.
Fuel
characterization
properties
measurement
were
conducted
using
Fourier
Transform
Infrared
ASTM
methods.
WPO
was
blended
with
conventional
diesel
(CDF)
different
volume
concentrations
water
(5%,
10%,
15%).
metrices
assessed
under
various
engine
conditions.
findings
indicate
that
optimum
condition
is
HR
17.3
°C/min,
PT
403
°C,
RT
96.30
min,
quality
confirms
its
suitability
source.
metrics
revealed
has
5.4%
lower
brake-thermal
efficiency
than
CDF,
inclusion
10%
in
(WPO10W)
enhances
11.5%.
in-cylinder
pressure
net-heat
release
are
1.3%
12.9%
respectively,
WPO10W
emulsion
promotes
efficient
combustion.
reduces
oxides
nitrogen,
hydrocarbon,
carbon
monoxide
emissions
21.2%,
9.8%,
22.2%,
compared
WPO.
A
novel
waste
plastic
pyrolysis
oil
hydrocracking
process
uniquely
integrating
simulation
with
advanced
deep
learning
models
for
multi-objective
optimization.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(30), С. 11074 - 11092
Опубликована: Июль 17, 2024
Annually,
an
enormous
amount
of
plastic
waste
is
produced
worldwide.
This
should
be
appropriately
managed
to
limit
the
environmental
burden.
However,
only
a
small
part
recycled;
rest
burned,
disposed
of,
or
ends
up
in
environment.
In
transition
toward
circular
economy,
chemical
recycling
has
emerged
as
promising
conversion
technique.
Much
research
focuses
on
producing
lightweight
liquids
and
gases.
it
crucial
emphasize
that
valuable
heavy
products,
such
waxes
lubricants,
can
also
obtained
through
upcycling.
perspective
examines
upcycling
polyolefin
plastics
into
high
molecular
weight
primarily
focusing
lubricants.
The
production
fractions
from
potential
profitable
strategy
value-added
products
are
obtained.
Favorable
life
cycle
assessments
prove
sustainable
strategy.
Literature
shows
different
techniques,
metathesis
hydrogenolysis
catalysis
thermal
pyrolysis,
used
obtain
plastics.
Among
these
methods,
pyrolysis
been
subject
extensive
most
mature
technology
today.
Additional
reactions
further
fine-tune
desired
compositional
product
properties,
clean
other
secondary
fuels
light
olefinic
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 21, 2025
Chemical
deconstruction
of
polyolefin
plastic
wastes
via
hydroconversion
is
promising
for
mitigating
accumulation
in
landfills
and
the
environment.
However,
catalysts
cannot
handle
complex
feedstocks
containing
multiple
polymers,
additives,
heteroatom
impurities.
Here,
we
report
a
single-step
strategy
using
earth-abundant
metal
sulfide
to
deconstruct
these
wastes.
We
show
that
NiMoSx/HY
feedstocks,
achieving
∼81–94%
selectivity
liquid
products.
Postsynthetic
zeolite
modification
enhances
catalyst's
activity
by
>2.5
times,
over
95%
fuels
with
controllable
product
distribution
naphtha,
jet
fuel,
diesel
range.
The
catalyst
resilient
increasingly
such
as
additive-containing
polymers
mixed
plastics
composed
polyolefins
heteroatom-containing
including
poly(vinyl
chloride).
extend
single-use
can
generate
toxic
byproducts,
HCl
NH3,
eliminate
their
emissions
integrating
reaction
sorption
one-step
process.
Clean Technologies,
Год журнала:
2025,
Номер
7(1), С. 20 - 20
Опубликована: Март 5, 2025
Plastic
waste
poses
a
significant
challenge
in
Africa
and
around
the
world,
with
its
volume
continuing
to
increase
at
an
alarming
rate.
In
Africa,
estimated
25–33%
of
daily
is
made
up
plastic,
posing
threat
environment,
marine
life,
human
health.
One
potential
solution
this
problem
waste-to-energy
recycling,
such
as
pyrolysis,
which
involves
conversion
materials
into
oil,
char,
non-condensable
gasses
through
thermochemical
process
absence
oxygen.
Given
abundance
continent’s
energy
challenges,
pyrolysis
offers
sustainable
solution.
This
review
delves
concept
products,
thermodynamics,
endothermic
kinetics,
presenting
it
promising
way
address
plastic
Africa.
Despite
African
Union’s
goal
recycle
waste,
continent
faces
barriers
achieving
target,
including
infrastructural,
economic,
social
difficulties.
It
crucial
implement
strategies
for
managing
mitigate
environmental
degradation
promote
cleaner
healthier
living
environment.
Pyrolysis
technology
highlighted
viable
management,
can
convert
valuable
byproducts
syngas.
Case
studies
from
countries
like
South
Nigeria
demonstrate
scaling
management
issues
while
generating
job
opportunities.
underscores
need
investment,
regulatory
support,
public
awareness
overcome
challenges
unlock
full
Embracing
method
could
lead
economic
benefits
continent.
