6 Catalysis with MNPs on N-Doped Carbon
211
Table 6.2 Lumina supported N-doped graphene activate cobalt nanoparticles-catalyzed
hydrogenation of carbonyl compounds [20]
HO
OH
Me
H
H
HO
HO
Me
H
H
H
O
O
HO
Me
H
H
H
HO
OH
Me
H
H
H
HO
O
Me
H
H
HO
O
Me
H
H
H
O
O
O
Me
H
H
H
HO
O
Me
H
H
H
Entry
Substrate
H 2 (atm) T (
o
C)
Product
1
98
20
2
99
30
3
98
30
4
97
30
Yield (%)
100
120
120
120
Catalyst (mol%)
4
6
6
6
R
1
R
2
O
R
1
R
2
OH
Co 3 O 4 -Co/NGr@ -Al 2 O 3 (4 mol%)
+ H 2
EtOH
R 1
R 1
Co-Phen/SiO 2 -800 (1 mol%)
H 2 (3 MPa), MeCN, 120
o C, 15 h
R 2
R 1
R 2
R 2 +
mejor
minor
Up to 93% Z-alkene selectivity
Up to 98% yield
Scheme 6.14 Cobalt nanoparticles-catalyzed semi-hydrogenation of alkynes to alkenes
Scheme 6.15 Dehydrogenation
of formic acid catalyzed by
cobalt nanocatalysts
HCOOH
Co-nanocatalyst
PhMe, 90
o
C
H 2 + CO 2
on SBA-15 silica support at 800 ° C under argon for 2 h and subsequent removal of
silica template by treating with 6 M sodium hydroxide aqueous solution at 60 °C for
24 h [27]. The resulting catalyst is highly efficient for acceptor-less dehydrogenation
of N-heterocycles to release H 2 as well as for the reverse transfer hydrogenation