Pt-based heterogeneous metal catalysts
are commonly used in the
hydrogenation of nitro groups. However, the continuous large metal
domain size and the complex interaction between the substrates and
metal surface usually inevitably result in side reactions, such as
dehalogenation of halogenated nitroaromatics. In this work, by simply
treating the Pt-based catalysts with CO at elevated temperature, the
Boudouard reaction taking place on Pt surface results in the deposition
of carbon species thereon. The carbon deposition not only inhibits
the dehalogenation by restricting the planar interaction of the aromatic
group with the Pt surface that is segmented by C, the hydrogenation
activity of the nitro group is also enhanced on the partially positively
charged surface Pt sites created by the electron-withdrawing interstitial
C. Such a simple treatment strategy is effective for fabricating Pt-based
catalysts on different supports toward the selective hydrogenation
of a wide range of halogenated nitroaromatics.
Improving the activity and durability of Pt-based electrocatalysts used in the acidic oxygen reduction reaction (ORR) is a great task for the commercial applications of proton-exchange membrane fuel cells. Alloying...
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