Highly Active and Chemoselective Reduction of Halogenated
Nitroarenes Catalyzed by Ordered Mesoporous Carbon Supported Platinum
Nanoparticles
Yao Sheng
Xueguang Wang
Zhikang Xing
Xiubin Chen
Xiujing Zou
Xionggang Lu
10.1021/acssuschemeng.9b00948.s001
https://acs.figshare.com/articles/journal_contribution/Highly_Active_and_Chemoselective_Reduction_of_Halogenated_Nitroarenes_Catalyzed_by_Ordered_Mesoporous_Carbon_Supported_Platinum_Nanoparticles/8041055
Highly
dispersed Pt nanoparticles (∼2.2 nm) on ordered mesoporous
carbon (Pt/CMK-3–HQ) were first prepared through a two-step
impregnation route with aqueous solutions of 8-hydroxyquinoline (8-HQ)
and H<sub>2</sub>PtCl<sub>6</sub>, respectively. The Pt/CMK-3–HQ
quantitatively converted various halogenated nitroarenes to the corresponding
haloanilines using hydrazine hydrate with unprecedented activities
(e.g., turnover frequency for <i>o</i>-chloronitrobenzene
was 30.2 s<sup>–1</sup>) and exhibited high stability with
20 cycles without decrease in catalytic efficiency. The high activity
and chemoselectivity of Pt/CMK-3–HQ were attributed to the
cooperation effect between Pt and N species, promoting cleavage of
hydrazine to generate more Pt–H<sup>–</sup> and N–H<sup>+</sup> species for reduction of nitro groups and weakening the interaction
between halogen groups and Pt atoms for activation of C-halogen bonds.
2019-04-17 00:00:00
Halogenated Nitroarenes Catalyzed
HQ
Chemoselective Reduction
impregnation route
Mesoporous Carbon
C-halogen bonds
N species
hydrazine hydrate
mesoporous carbon
H 2 PtCl 6
Platinum Nanoparticles
nitro groups
20 cycles
Pt atoms
halogen groups
cooperation effect