Bimetallic
nanocatalysts, with efficient and controllable catalytic
performance, have a promising application in chemical production.
In this study, surface Pt-rich bimetallic AuPt nanoparticles with
different Pt/Au ratios were prepared and tested in selective hydrogenation
reactions of substituted nitroaromatics. Au nanoparticles were first
prepared with n-butyllithium as a rapid reducer,
which were further used as seeds in the slow growth process of Pt
atoms. Because of the employed sequential reduction method and the
following atom diffusion, surface Pt-rich bimetallic AuPt nanoparticles
were obtained. Compared with the uniform AuPt alloy nanocatalysts
synthesized by the co-reduction method with n-butyllithium
as the reducer and monometallic Pt nanocatalysts, the obtained surface
Pt-rich AuPt bimetallic nanocatalysts presented an enhanced catalytic
selectivity or activity. The performance enhancement is assigned to
the optimized Au/Pt interaction in the surface Pt-rich bimetallic
nanostructures. This work demonstrates that the optimization of the
stoichiometry and construction of bimetallic materials is a feasible
method to synthesize controllable and efficient nanocatalysts.
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