Green Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Seven
types
of
plastics,
from
varied
structures
and
sources,
were
pyrolyzed
in
a
fluidized
bed
reactor.
The
resulting
oils
analyzed
by
GC×GC,
NMR,
ICP,
while
theory
experiments
combined
to
explore
the
degradation
mechanism.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(19), P. 7508 - 7518
Published: April 30, 2024
A
deeper
understanding
of
pyrolysis
reaction
pathways
under
an
isothermal,
reaction-controlled
regime
is
essential
for
studying
the
kinetics
and
optimizing
design
reactors.
This
work
methodically
studied
effect
various
variables
on
product
distribution
high-density
polyethylene
(HDPE)
to
validate
conditions
that
minimize
transport
effects
secondary
gas-phase
reactions.
The
primary
decomposition
HDPE
was
performed
using
a
Box–Behnken
evaluate
role
such
as
particle
size,
sample
carrier
gas
flow
rate,
temperature.
Pyrolysis
experiments
used
micropyrolyzer
connected
two-dimensional
chromatography
with
flame
ionization
time-of-flight
spectrometer
detectors
(Py–GC
×
GC–FID/TOF–MS).
Principal
component
analysis
data
showed
statistical
differences
in
yield
C3
C28
hydrocarbons
temperature
varied
between
480
600
°C.
Furthermore,
larger
size
1000
μg
resulted
different
compared
smaller
sizes
50–150
μg.
At
°C,
yields
cyclodiolefins,
cycloolefins,
aromatics
increased
by
approximately
355,
67,
62%,
respectively,
when
from
50
μg,
rate
decreased
100
mL
min–1.
AIChE Journal,
Journal Year:
2024,
Volume and Issue:
70(12)
Published: Aug. 6, 2024
Abstract
In
this
study,
the
catalytic
(co‐)pyrolysis
of
low‐density
polyethylene
(LDPE)
and
terephthalate
(PET)
with
HZSM‐5
HY
zeolite
catalysts
was
conducted
in
a
micro‐pyrolysis
reactor
coupled
to
two‐dimensional
gas
chromatography
system.
Pyrolysis
operating
conditions,
such
as
pyrolysis
temperature,
catalyst
feedstock
(CF)
ratio,
LDPE:PET
were
varied.
It
found
that
for
co‐pyrolysis
LDPE
PET,
led
higher
yields
C2‐C4
olefins
monoaromatic
products.
Lower
CF
ratios
increased
yield
pyrolysis,
but
decreased
benzene
PET
concomitant
an
benzoic
acid.
A
lower
temperature
400°C
which
sufficient
LDPE,
incomplete
conversion
PET.
Surface
response
diagrams
used
visualize
impact
various
conditions
on
BTEX,
serve
target
products
circular
economy.