Catalysts,
Год журнала:
2022,
Номер
12(12), С. 1667 - 1667
Опубликована: Дек. 18, 2022
Formaldehyde
is
an
important
downstream
chemical
of
syngas.
Furniture
and
household
products
synthesized
from
formaldehyde
will
slowly
decompose
release
again
during
use,
which
seriously
affects
indoor
air
quality.
In
order
to
solve
the
pollution
problem,
this
paper
took
catalytic
oxidation
as
research
object;
prepared
a
series
low-cost,
acid-treated
manganese
dioxide
nanorod
catalysts;
investigated
effect
acid-treatment
conditions
on
catalysts’
activity.
It
was
found
that
MnNR-0.3ac-6h
catalyst
with
0.3
mol/L
sulfuric
acid
for
6
h
had
best
The
conversion
rate
reached
98%
at
150
°C
90%
25
room
temperature.
During
reaction
time
144
h,
about
90%,
maintained
high
treatment
could
increase
number
oxygen
vacancies
surface
catalysts
promote
production
reactive
species.
amount
species
13%
higher
than
without
treatment.
Chemical Society Reviews,
Год журнала:
2022,
Номер
51(11), С. 4386 - 4464
Опубликована: Янв. 1, 2022
The
emerging
field
of
organometallic
catalysis
has
shifted
towards
research
on
Earth-abundant
transition
metals
due
to
their
ready
availability,
economic
advantage,
and
novel
properties.
In
this
case,
manganese,
the
third
most
abundant
transition-metal
in
Earth's
crust,
emerged
as
one
leading
competitors.
Accordingly,
a
large
number
molecularly-defined
Mn-complexes
been
synthesized
employed
for
hydrogenation,
dehydrogenation,
hydroelementation
reactions.
regard,
catalyst
design
is
based
three
pillars,
namely,
metal-ligand
bifunctionality,
ligand
hemilability,
redox
activity.
Indeed,
developed
catalysts
not
only
differ
chelating
atoms
they
possess
but
also
working
principles,
thereby
different
turnover
numbers
product
molecules.
Hence,
critical
assessment
molecularly
defined
manganese
terms
atoms,
reaction
conditions,
mechanistic
pathway,
significant.
Herein,
we
analyze
complexes
catalytic
activity,
versatility
allow
multiple
transformations
routes
convert
substrates
target
This
article
will
be
helpful
get
significant
insight
into
design,
aiding
design.
Energy & Fuels,
Год журнала:
2024,
Номер
38(6), С. 4836 - 4880
Опубликована: Март 12, 2024
The
survival
and
sustainable
development
of
humanity
are
gravely
threatened
by
climate
change,
which
has
recently
been
elevated
to
the
status
one
greatest
threats
humanity's
security
on
a
worldwide
scale.
In
response
global
how
obtain
renewable
clean
fuels
is
an
important
challenge
for
human
society.
order
reach
carbon
peak
attain
neutrality,
using
CO2
as
resource
become
crucial
aim
civilization.
Converting
into
chemical
products
with
higher
added
value,
that
is,
utilization
technology
can
not
only
achieve
emission
reduction
but
also
have
certain
economic
benefits.
technologies
primarily
include
photocatalytic
reduction,
electrocatalytic
thermal
catalytic
relay
catalysis.
This
paper
mainly
summarizes
mechanism
conversion
research
related
catalysts,
discusses
prospects
system
(catalyst
modification,
product
selectivity
improvement,
etc.).
ideas
guidance
provided
efficient
stable
catalysts
application
in
areas
environment
energy.
JACS Au,
Год журнала:
2021,
Номер
1(2), С. 130 - 136
Опубликована: Янв. 25, 2021
Alcohol-assisted
hydrogenation
of
carbon
monoxide
(CO)
to
methanol
was
achieved
using
homogeneous
molecular
complexes.
The
manganese
complex
[Mn(CO)2Br[HN(C2H4P
i
Pr2)2]]
([HN(C2H4P
Pr2)2]
=
MACHO-
Pr)
revealed
the
best
performance,
reaching
up
turnover
number
4023
and
frequency
857
h-1
in
EtOH/toluene
as
solvent
under
optimized
conditions
(T
150
°C,
p(CO/H2)
5/50
bar,
t
8-12
h).
Control
experiments
affirmed
that
reaction
proceeds
via
formate
ester
intermediate,
whereby
a
catalytic
amount
base
found
be
sufficient
mediate
its
formation
from
CO
alcohol
situ.
Selectivity
for
reached
>99%
with
no
accumulation
ester.
demonstrated
work
component,
resulting
reactive
system
allows
"breeding"
without
any
coreagents.
Advanced Synthesis & Catalysis,
Год журнала:
2021,
Номер
363(22), С. 5028 - 5046
Опубликована: Сен. 22, 2021
Abstract
C‐methylation
is
a
vitally
important
reaction
applicable
in
chemical
synthesis
and
structure‐based
drug
design.
Notably,
the
“magic
methyl”
effect
has
become
decisive
medicinal
chemistry
discovery
for
modulation
of
bio‐active
properties
life
science
molecules.
In
this
regard,
widely
applied
modification
various
biomolecules,
pharmaceuticals,
natural
products.
general,
often
relies
on
activated,
hazardous
uneconomical
methyl
sources
such
as
diazomethane,
dimethyl
sulfate,
halides.
To
achieve
methylation
reactions
sustainable
cost‐effective
manner,
use
‘ideal’
C1
source
crucial.
methanol
constitutes
an
expedient
−CH
3
because
simple
alcohol
less‐hazardous,
inexpensive,
abundantly
available
platform
well
it
produces
only
water
by‐product
processes.
Regarding
potential
catalysts
to
perform
using
by
hydrogen
borrowing
methodology,
non‐noble
metal‐based
are
highly
preferable
due
their
unique
advantages
more
abundance,
inexpensive
low‐toxicity.
recent
years,
chemists
made
significant
contributions
towards
catalytic
valorization
insert
groups
via
C−H
activation
variety
compounds
Consequently,
minireview
we
summarize
process
applying
Fe‐,
Mn‐,
Co‐
Ni‐based
metal
free
catalysts.
magnified
image
ACS Catalysis,
Год журнала:
2022,
Номер
12(7), С. 3995 - 4001
Опубликована: Март 15, 2022
Conversion
of
readily
available
feedstocks
to
valuable
platform
chemicals
via
an
eco-friendly
catalytic
pathway
has
always
been
one
the
key
focuses
synthetic
chemists.
In
this
context,
herein,
we
report
selective
transformation
feedstock,
vicinal
glycols,
value-added
α-hydroxycarboxylic
acid
molecules
that
are
prevalent
in
bioactive
and
biodegradable
polymers.
A
bench
stable
Earth-abundant
metal
complex,
{[HN(C2H4PPh2)2]Mn(CO)2Br},
Mn-I
catalyzed
reformation
reaction
at
low
temperature
high
selectivity
with
a
turnover
number
reaching
2400,
surpassing
previously
used
homogeneous
catalysts
for
such
reaction.
Hydrogen
gas
is
evolved
as
byproduct
without
needing
acceptor.
The
developed
protocol
applicable
both
aromatic
aliphatic
delivering
α-substituted
hydroxycarboxylic
acids
yields
selectivities.
Detailed
mechanistic
studies
elucidated
involvements
different
manganese(I)-species
during
acceptorless
dehydrogenation
catalysis.
Chinese Journal of Chemistry,
Год журнала:
2023,
Номер
42(2), С. 199 - 221
Опубликована: Сен. 20, 2023
Comprehensive
Summary
Carbon
monoxide
(CO)
has
become
one
of
the
most
relevant
and
versatile
renewable
C1
building
blocks
for
chemical
synthesis,
especially
in
fine
chemicals
industry,
due
to
development
efficient
selective
catalysts
its
activation.
In
this
review,
we
present
a
comprehensive
critical
analysis
last
10
years
literature
on
use
CO
as
feedstock
production.
The
review
is
organized
by
type
catalytic
reaction,
namely
alkene
alkyne
carbonylation,
hydroformylation,
carbonylation
aryl
halides,
carbonylative
cross‐coupling
C—H
carbonylation.
Notable
examples
synthesis
and/or
known
pharmaceuticals
are
highlighted.
Emphasis
placed
utilizing
block
or
more
steps.
catalyst
used
reaction
conditions
consistently
presented
throughout
all
examples.
ChemCatChem,
Год журнала:
2021,
Номер
13(14), С. 3319 - 3323
Опубликована: Май 7, 2021
Abstract
The
hydrogenation
of
CO
2
to
methanol
was
achieved
using
a
catalytic
system
comprising
metal
complexes
the
form
[Mn(CO)
[N(C
H
4
PR
)]
(R=
i
Pr/Ph,
[HN(C
PPh
)
]=MACHO−Ph)
together
with
Lewis
acid
additives.
Mechanistic
studies
suggest
initial
insertion
into
Mn−H
bond
leads
formate
complex
as
resting
state.
By
systematically
balancing
interaction
between
acidic
additive
and
catalyst,
ligand
could
be
removed
through
esterification
unleash
full
potential.
reaction
conditions
were
optimized
on
basis
partial
order
relevant
compounds.
combination
MACHO−Ph
Ti(O
Pr)
identified
most
active
TON
160
(
p
(CO
)=5
bar,
(H
)=160
T
=150
°C).
Using
solvent
co‐reagent
allows
conversion
/H
in
liquid
phase
process
only
substrates
products.
Journal of Analytical and Applied Pyrolysis,
Год журнала:
2023,
Номер
175, С. 106217 - 106217
Опубликована: Окт. 1, 2023
Fundamental
understanding
of
the
pyrolysis
process
plays
an
indispensable
role
in
valorization
wastes
and
development
novel
sustainable
technologies.
This
study
introduces
a
approach
by
investigating
reaction
mechanisms
involve
Microwave-Assisted
Fast
Pyrolysis
(MAFP)
to
unveil
thermal
decomposition
agricultural
residues:
pecan
nutshell
(NS),
sugarcane
bagasse
(SB),
orange
seed
(OS)
biomasses.
The
holistic
for
these
biomasses
was
analyzed
based
on
final
chemical
compositions
yields
bio-oil,
biochar
biogas
correlated
microwave
processing
conditions
feedstock's
composition.
findings
revealed
that
bio-oil
is
enhanced
at
moderated
energy
(<5
GJ/t)
as
result
endothermic
reactions
such
heterolytic
fragmentation,
Maccoll
elimination,
Friedel-Craft
acylation,
Piancatelli
rearrangement
methoxylation.
maximum
yield
protein-rich
biomass
due
selective
heating
(Paal-Knorr
pyrrole
synthesis,
Baeyer-Villiger
oxidation,
Maillard
reaction,
ring
conversion
γ-butyrolactone).
formation
attributed
repolymerization
aromatic
aldehydes,
hydrocarbons,
amines,
ethers,
well
dehydroxymethylation
dealkylation
processes.
provides
comprehensive
several
using
pyrolysis,
establish
bases
effective
waste
management.
JOURNAL OF RENEWABLE MATERIALS,
Год журнала:
2023,
Номер
11(6), С. 2593 - 2629
Опубликована: Янв. 1, 2023
Globally,
fossil
fuel
dependence
has
created
several
environmental
challenges
and
climate
change.
Hence,
creating
other
alternative
renewable
ecologically
friendly
bio-energy
sources
is
necessary.
Lignocellulosic
biomass
gained
significant
attention
recently
as
a
material
for
biofuel
production.
The
large
amounts
of
plantain
banana
plant
parts
wasted
after
harvesting,
well
the
peels
generated
daily
by
fruit
market
industries,
demonstrate
potential
bioenergy
resources.
This
review
briefly
assesses
(PBB)
in
developing,
developed,
underdeveloped
countries,
consumable
parts,
feasible
products
yield.
It
emphasized
advantages
disadvantages
commonly
adopted
treatment
technologies
composting,
incineration,
landfilling.
Further,
utilization
PBB
catalysts
biodiesel
synthesis
was
highlighted.
To
optimize
recovery
biofuel,
different
integration
routes
pyrolysis,
anaerobic
digestion,
fermentation,
hydrothermal
carbonization,
liquefaction,
gasification
valorization
were
proposed.
complex
compounds
present
(hemicellulose,
cellulose,
lignin)
can
be
converted
into
valuable
bio-products
such
methane
gas
bio-ethanol
bioenergy,
nutrients
to
promote
bioactive
ingredients.
investigation
viability
innovation
integrated
routes'
technology
necessary
improve
circular
bio-economy
biofuels
from
waste,
particularly
PBB.
Molecules,
Год журнала:
2022,
Номер
27(19), С. 6293 - 6293
Опубликована: Сен. 23, 2022
Organophosphorus
ligands
are
an
invaluable
family
of
compounds
that
continue
to
underpin
important
roles
in
disciplines
such
as
coordination
chemistry
and
catalysis.
Their
success
can
routinely
be
traced
back
facile
tuneability
thus
enabling
a
high
degree
control
over,
for
example,
electronic
steric
properties.
Diphosphines,
phosphorus
bearing
two
separated
PIII
donor
atoms,
also
highly
valued
impart
their
own
unique
features,
example
excellent
chelating
properties
upon
metal
complexation.
In
many
classical
this
type,
the
backbone
connectivity
has
been
based
on
all
carbon
spacers
only
but
there
is
growing
interest
embedding
other
atoms
additional
nitrogen
(–NH–,
–NR–)
sites.
This
review
will
collate
some
examples
field,
illustrate
role
highlight
reactivities
applications.
It
shown
incorporation
nitrogen-based
group
unusual
catalytic