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Selective Hydrogenation of 4-Nitrobenzaldehyde to 4-Aminobenzaldehyde by Colloidal RhCu Bimetallic Nanoparticles


Monodisperse RhCu bimetallic nanoparticles (NPs) with various compositions were prepared by the co-reduction of Rh and Cu ions in the presence of poly(N-vinyl-2-pyrrolidone) (PVP). Powder X-ray diffraction analysis of the PVP-stabilized RhCu NPs revealed the formation of a novel solid-solution structure in which the Rh and Cu atoms are randomly distributed. The catalytic properties of the colloidal RhCu NPs were studied using hydrogenation of 4-nitrobenzaldehyde as a test reaction. We found that the RhCu NPs efficiently reduced 4-nitrobenzaldehyde using atmospheric hydrogen at room temperature and that the selectivity to 4-aminobenzaldehyde was enhanced from ~70 % with monometallic Rh NPs to ~97 % with RhCu NPs with a Cu content of 50 %.

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    The absorbance of RhCu(50/50):PVP in the near IR region was reduced when a larger amount of PVP (100 equivalent) was used in the preparation (data not shown). Improvement of the dispersion of the NPs was also confirmed by the TEM observation. Nevertheless, we focused on the catalysis of RhCu(50/50):PVP prepared with 20 equivalent of PVP because RhCu(50/50) NPs prepared with 100 equivalent of PVP were partially oxidized in air probably due to smaller size (2.2 nm).


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This research was financially supported by the Funding Program for Next Generation World-Leading Researchers (NEXT Program) (GR − 003), and part of this work was performed under the management of the “Elements Strategy Initiative for Catalysts & Batteries (ESICB),” supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Correspondence to Tatsuya Tsukuda.

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Sharif, M.J., Yamazoe, S. & Tsukuda, T. Selective Hydrogenation of 4-Nitrobenzaldehyde to 4-Aminobenzaldehyde by Colloidal RhCu Bimetallic Nanoparticles. Top Catal 57, 1049–1053 (2014).

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  • Selective hydrogenation
  • Nitrobenzaldehyde
  • RhCu bimetallic nanoparticles
  • Solid solution