Abstract:
One-pot selective conversion of biomass-derived furfural (FFald) into cyclopentanone (CPO) or cyclopentanol
(CPL) using bimetallic nickel-based supported on TiO2 (denoted as Ni-M(3.0)/TiO2; M = Co
and Fe; 3.0 is Ni/M molar ratio) have been investigated. Catalysts were synthesized via a hydrothermal
method
at
150
°C
for
24
h,
followed
by
H2
reduction
at
450
°C
for
1.5
h.
X-ray
Diffraction
(XRD)
analysis
showed
that
the
formation
of
Ni-Co
alloy
phase
at
2θ
=
44.2°
for
Ni-Co(3.0)/TiO2
and
Ni-Fe
alloy
at 2θ = 44.1° for Ni-Fe(3.0)/TiO2. The amount of acid sites was measured by using ammoniatemperature
programmed desorption (NH3-TPD). Ni-Co(3.0)/TiO2 has three NH3 desorption peaks at
180 °C, 353 °C, and 569 °C with acid site amounts of 1.30 µmol.g
-1
, 1.0 µmol.g
-1
, and 2.0 µmol.g
-1
,
respectively. On the other hand, Ni-Fe(3.0)/TiO2 consisted of NH3 desorption peaks at 214 °C and 626
°C with acid site amounts of 3.3 µmol.g
-1
and 2.0 µmol.g
-1
, respectively. Both Ni-Co(3.0)/TiO2 and NiFe(3.0)/TiO2
catalysts
were
found
to
be
active
for
the
selective
hydrogenation
of
FFald
to
furfuryl
alcohol
(FFalc)
at
low
temperature
of
110
°C,
H2
3.0
MPa,
3
h
with
FFalc
selectivity
of
81.1%
and
82.9%,
respectively.
High
yields
of CPO (27.2%) and CPL (41.0%) were achieved upon Ni-Fe(3.0)/TiO2 when
the reaction temperature was increased to 170 °C, 3.0 MPa of H2, and a reaction time of 6 h. The yield
of CPO+CPL on the reused catalyst decreased slightly after the second reaction run, but the activity
was maintained for at least three consecutive runs.
