Abstract
The
efficient
utilization
of
organic
solid
waste
resources
can
help
reducing
the
consumption
conventional
fossil
fuels,
mitigating
environmental
pollution,
and
achieving
green
sustainable
development.
Due
to
its
dual
nature
being
both
a
resource
source
it
is
crucial
implement
suitable
recycling
technologies
throughout
upgrading
processes
for
plastics
biomass,
which
are
wastes
with
complex
mixture
components.
pyrolysis
hydropyrolysis
were
summarized
biomass
into
high‐value
chemicals,
materials.
To
enhance
reaction
efficiency
improve
product
selectivity,
microwave‐assisted
was
introduced
through
energy
supply
especially
aid
catalysts
microwave
absorbers.
This
review
provides
detail
summary
from
technical,
applied,
mechanistic
perspectives.
Based
on
recent
technological
advances,
future
directions
development
predicted.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(3), С. 1423 - 1440
Опубликована: Янв. 10, 2024
Plastic
waste
has
emerged
as
a
serious
issue
due
to
its
impact
on
environmental
degradation
and
resource
scarcity.
recycling,
especially
of
halogen-containing
plastics,
presents
challenges
potential
secondary
pollution
lower-value
implementations.
Chemical
recycling
via
pyrolysis
is
the
most
versatile
robust
approach
for
combating
plastic
waste.
In
this
Review,
we
present
recent
advancements
in
halogen-plastic
utilization
pathways
from
"reducing
upcycling"
halogens.
We
emphasize
advanced
management
halogen-plastics
through
copyrolysis
with
solid
wastes
(waste
polymers,
biomass,
coal,
etc.),
which
an
efficient
method
dealing
mixed
obtain
high-value
products
while
reducing
undesirable
substances.
Innovations
catalyst
design
reaction
configurations
catalytic
are
comprehensively
evaluated.
particular,
tandem
catalysis
system
promising
route
halogen
removal
selective
conversion
targeted
products.
Furthermore,
propose
novel
insights
regarding
upcycling
halogens
halogen-plastics.
This
includes
preparation
halogen-based
sorbents
elemental
mercury
removal,
halogenation–vaporization
process
metal
recovery,
development
halogen-doped
functional
materials
new
energy
applications.
The
reutilization
facilitates
halogen-plastics,
but
many
efforts
needed
mutually
beneficial
outcomes.
Overall,
future
investigations
catalyst-driven
technologies
highlighted.
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.
Chemical Engineering Science,
Год журнала:
2023,
Номер
271, С. 118569 - 118569
Опубликована: Фев. 16, 2023
Different
plastics
recovered
from
a
local
urban
solid
waste
plant
were
collected
before
landfilling,
separated,
and
classified
by
families,
i.e.
polyethylene
(PE),
polypropylene
(PP),
high
impact
expanded
polystyrene
(HIPS
EPS,
respectively),
terephthalate
(PET),
polyvinyl
chloride
(PVC).
A
systematic
pyrolysis
study
was
carried
out
to
compare
the
different
behavior
registered
in
each
plastic
type,
an
integral
analysis
of
produced
oils
synthetic
gas
conducted.
In
general
terms,
oil
yield
followed
order
EPS
>
PP
PE
HIPS
PET
PVC,
reaching
maximum
values
over
500
°C
after
1
h
treatment.
The
HIPS,
PET,
rich
light
compounds,
i.e.,
C5-C9
hydrocarbons.
Almost
100
%
aromatic.
aromatic
fraction
important
case
PVC
(57
%)
(45
%).
with
most
varied
distribution
compounds
but
olefins
(67
non-condensable
composition
showed
that
all
gases
methane
50
(vol.),
ethane
importance.
CO
PET.
