Heterogeneous Ni Catalyst
for Direct Synthesis of
Primary Amines from Alcohols and Ammonia
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Abstract
This paper reports the synthesis of primary amines from
alcohols
and NH<sub>3</sub> by an Al<sub>2</sub>O<sub>3</sub>-supported Ni
nanoparticle catalyst as the first example of heterogeneous and noble-metal-free
catalytic system for this reaction without additional hydrogen sources
under relatively mild conditions. Various aliphatic alcohols are tolerated,
and turnover numbers were higher than those of Ru-based homogeneous
catalysts. The catalyst was recoverable and was reused. The effects
of the Ni oxidation states and the acid–base nature of support
oxides on the catalytic activity are studied. It is clarified that
the surface metallic Ni sites are the catalytically active species,
and the copresence of acidic and basic sites on the support surface
is also indispensable for this catalytic system