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Remarkable Effect of Alkalis on Chemoselective Hydrogenation of Functionalized Nitroarenes over High-Loading Pt/FeOx Catalysts

Abstract

The chemoselective hydrogenation of substituted nitroarenes to the corresponding functionalized anilines is a type of important reactions in fine chemistry, and the chemoselectivity is critically dependent on the rational design of catalysts. In particular, this reaction has rarely been accomplished over high-loading Pt catalysts due to the formation of Pt crystals. Here we for the first time reported that alkali metals (Li+, Na+, K+, etc.) could transform the non-selective high loading Pt/FeOx catalyst to a highly chemoselective one. The best result was obtained over a 5%Na-2.16%Pt/FeOx catalyst, which enhanced the chemoselectivity from 66.4% to 97.4% while the activity remained almost unchanged for the probe reaction of 3-nitrostyrene hydrogenation to 3-aminostyrene. By using aberration-corrected HAADF-STEM, in situ XAS, 57Fe Mössbauer and DRIFT spectroscopy, an active site of Pt-O-Na-O-Fe-like species was proposed, which ensure the Pt centers isolated and positively charged for the preferential adsorption of –NO2 group.

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Publication details

The article was received on 07 Feb 2017, accepted on 11 May 2017 and first published on 16 May 2017


Article type: Edge Article
DOI: 10.1039/C7SC00568G
Citation: Chem. Sci., 2017, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Remarkable Effect of Alkalis on Chemoselective Hydrogenation of Functionalized Nitroarenes over High-Loading Pt/FeOx Catalysts

    H. Wei, Y. Ren, A. Wang, X. Liu, X. Liu, L. Zhang, S. Miao, L. Li, J. Liu, J. Wang, G. Wang, D. Su and T. Zhang, Chem. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7SC00568G

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