Exploring cost-effective electrocatalysts for oxygen reduction reaction (ORR) is a prerequisite yet challenge for many energy conversion and storage systems. The direct pyrolysis of zeolitic imidazolate framework (ZIF) materials has...
Effects of preparation parameters
of NiAl oxide-supported Au nanocatalysts
on their performance in the chemoselective hydrogenation of nitro
compounds were investigated. The deposition–precipitation method,
low Au loading, and low Ni/Al molar ratio of the support contributed
to the generation of small-sized Au nanoparticles. High catalytic
properties were related to the small sizes of Au particles and appropriate
basicity of supports. Accordingly, the 0.43% Au/NiAlO-2-500 (the Ni/Al
molar ratio of the support = 2) showed high activity and excellent
selectivity for nitro hydrogenation. It also showed good versatility
for other nitro compounds and good recyclability. Interestingly, for
the first time, this Au catalyst switched its selectivity to vinyl
hydrogenation by mere regulation of the composition of the support
(the Ni/Al molar ratio of the support = 4). The observed shift in
selectivity was ascribed to the different adsorption behaviors of
the nitro and vinyl group on Au nanocatalysts. It provides a novel
and facile strategy to construct Au nanocatalysts with high activity
and switchable selectivity for hydrogenation of nitro compounds by
the fine tuning of preparation parameters.
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