Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 6, 2024
The
selective
upcycling
of
polyolefins
to
create
products
increased
value
has
emerged
as
an
innovative
approach
carbon
resource
stewardship,
drawing
significant
scientific
and
industrial
interest.
Although
recent
advancements
in
recycling
technology
have
facilitated
the
direct
conversion
hydrocarbons
or
oxygenated
compounds,
synthesis
nitrogenated
compounds
from
such
waste
not
yet
been
disclosed.
Herein,
we
demonstrate
a
novel
for
by
efficiently
transforming
range
postconsumer
plastic
into
nitriles
amides.
This
process
leverages
catalytic
properties
manganese
dioxide
combination
with
inexpensive
nitrogen
source,
urea,
make
it
both
practical
economically
viable.
Our
only
opens
new
avenues
creation
chemicals
polyolefin
but
also
underscores
critical
importance
valorizing
resources
originally
derived
fossil
fuels.
study
provides
strategy
sustainable
polyolefins.
Langmuir,
Год журнала:
2024,
Номер
40(10), С. 5077 - 5089
Опубликована: Фев. 15, 2024
Plastics
with
an
inert
carbon–carbon
(C–C)
backbone,
such
as
polyethylene
(PE),
polypropylene
(PP),
polystyrene
(PS),
and
polyvinyl
chloride
(PVC),
are
the
most
widely
used
types
of
plastic
in
human
activities.
However,
many
these
polymers
were
directly
discarded
nature
after
use,
few
appropriately
recycled.
This
not
only
threatens
natural
environment
but
also
leads
to
waste
carbon
resources.
Conventional
chemical
recycling
plastics,
including
pyrolysis
catalytic
cracking,
requires
a
high
energy
input
due
inertness
C–C
bonds
C–H
complex
product
distribution.
In
recent
years,
significant
progress
has
been
made
development
catalysts
introduction
small
molecules
additional
coreactants,
which
could
potentially
overcome
challenges.
this
Review,
we
summarize
highlight
strategies
that
address
issues
upcycling
backbone
plastics
molecules,
particularly
heterogeneous
catalysis.
We
believe
review
will
inspire
methods
for
using
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(33)
Опубликована: Май 22, 2024
Plastic
pollution
is
an
emerging
global
threat
due
to
lack
of
effective
methods
for
transforming
waste
plastics
into
useful
resources.
Here,
we
demonstrate
a
direct
oxidative
upcycling
polyethylene
high-value
and
high-volume
saturated
dicarboxylic
acids
in
high
carbon
yield
85.9
%
which
the
long
chain
(C10-C20)
can
reach
58.9%
over
cobalt-doped
MCM-41
molecular
sieves,
absence
any
solvent
or
precious
metal
catalyst.
The
distribution
be
controllably
adjusted
from
short-chain
(C4-C10)
long-chain
ones
through
changing
cobalt
loading
under
nanoconfinement.
Highly
sparsely
dispersed
along
with
confined
space
mesoporous
structure
enables
complete
degradation
selectivity
acid
mild
condition.
So
far,
this
first
report
on
highly
selective
one-step
preparation
acids.
approach
provides
attractive
solution
tackle
plastic
promising
alternative
route
diacids.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(28), С. 19449 - 19459
Опубликована: Июль 2, 2024
Mechanical
recycling
is
one
of
the
simplest
and
most
economical
strategies
to
address
ever-increasing
plastic
pollution,
but
it
cannot
be
applied
immiscible
mixed
plastics
suffers
from
property
deterioration
after
each
cycle.
By
combining
amphiphilic
block
copolymer
strategy
reactive
compatibilization
strategy,
we
designed
a
series
stapler
for
compatibilizing/upcycling
plastics.
First,
various
functionalized
graft
copolymers
were
accessed
via
different
synthetic
routes.
Subsequently,
addition
very
small
amount
molecules
induced
synergistic
effect
with
that
improved
compatibility
mechanical
properties
These
highly
effective
binary/ternary
systems
can
directly
postconsumer
waste
plastics,
which
increase
toughness
by
162
times.
Most
importantly,
also
effectively
impact
resistance,
adhesion
performance,
three-dimensional
(3D)
printing
performance
permitted
blends
20
times
minimal
degradation
in
their
properties.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 8, 2024
Abstract
Waste
plastics
bring
about
increasingly
serious
environmental
challenges,
which
can
be
partly
addressed
by
their
interconversion
into
valuable
compounds.
It
is
hypothesized
that
the
porosity
and
acidity
of
a
zeolite‐based
catalyst
will
affect
selectivity
effectiveness,
enabling
controllable
selective
conversion
polyethylene
(PE)
gas‐diesel
or
lubricating
base
oil.
A
series
embryonic,
partial‐
well‐crystalline
zeolites
beta
with
adjustable
are
prepared
from
mesoporous
SBA‐15.
The
catalysts
catalytic
systems
studied
nuclear
magnetic
resonance
(NMR),
X‐ray
diffraction
(XRD),
adsorption
kinetics
reactions.
zeolite‐beta‐based
achieve
toward
oil
for
PE
cracking.
With
mesopores
appropriate
acid
sites,
fast
escape
reduced
production
cracking
intermediates
observed,
leading
to
significant
fraction
(88.7%)
more
micropores,
high
density,
strong
strength,
multiply
cracked
low
carbon
number
hydrocarbons.
center
zeolite
confirmed
facilitate
significantly
activation
hydrogen
(H
2
),
and,
an
in
situ
ammonia
poisoning
strategy
inhibit
transfer
effectively
regulate
product
distribution.
Industrial & Engineering Chemistry Research,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 10, 2025
Hydroformylation
of
alkenes
is
one
the
most
important
industrial
processes
for
production
value-added
aldehydes.
A
new
square-planar
geometry
rhodium(I)
complex,
RhI(CO)(terpyridine),
has
been
synthesized
and
characterized
using
nuclear
magnetic
resonance
(NMR),
electrospray
ionization
mass
spectrometry
(ESI-MS),
single-crystal
X-ray
diffraction
(XRD),
scanning
electron
microscopy
(SEM).
This
complex
crystallizes
in
a
self-replicating
manner
through
RhI···RhI
π–π
interactions
at
room
temperature,
allowing
it
to
function
as
carrier-free
recyclable
rhodium
catalyst
hydroformylation
various
alkenes,
which
effectively
addresses
challenge
associated
with
separation
catalysts
from
products.
The
unique
packing
model
enables
RhI(CO)(terpyridine)
partially
dissolve
under
conditions,
thereby
acting
homogeneous
catalyst.
Furthermore,
maintains
both
consistent
reactivity
structural
integrity
cyclohexene
reactions
over
10
recycling
runs
standard
reaction
conditions
(40
bar,
100
°C,
4
h).
Additionally,
integrated
advantages
catalysis
heterogeneous
separation,
demonstrated
by
its
high
robust
recyclability
long-chain
C6–C18
α-methylstyrene,
mixed
octenes,
highlighting
potential
applications.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Март 21, 2025
Abstract
Upcycling
waste
plastics
into
liquid
fuels
presents
significant
potential
for
advancing
the
circular
economy
but
is
hindered
by
poor
selectivity
and
low-value
methane
byproduct
formation.
In
this
work,
we
report
that
atomic
Ru-doped
ZrO
2
can
selectively
convert
100
grams
of
post-consumer
polyethylene
polypropylene,
yielding
85
mL
in
a
solvent-free
hydrocracking.
The
(C
5
-C
20
)
comprises
~70%
jet-fuel-ranged
branched
hydrocarbons
8
16
),
while
gas
product
liquefied-petroleum-gas
3
6
without
ethane.
We
found
Ru
dopant
Ru-O-Zr
moiety
functionalizes
its
neighboring
O
atom,
originally
inert,
to
create
Brønsted
acid
site.
This
site,
rather
than
itself,
governs
internal
C−C
bond
cleavage
polyolefins
through
carbonium
ion
mechanism,
thereby
enhancing
yield
suppressing
oxide
modulation
strategy
provides
paradigm
shift
catalyst
design
hydrocracking
holds
broad
spectrum
applications.
