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High-performance Pd nanoalloy on functionalized activated carbon for the hydrogenation of nitroaromatic compounds

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 259, Page: 161-169
2015
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Metrics Details

  • Citations
    50
    • Citation Indexes
      50
  • Captures
    24

Article Description

Coconut shell activated carbon (AC) was successfully functionalized with diaminocyclohexane groups. The functionalized AC was used as a carrier to complex metal ions for preparation of the supported Pd, Pd–B and Pd–Ni–B. Pd or its alloy particles were highly dispersed on the functionalized AC and have a narrow size distribution of 2–5 nm. Amorphous structure of Pd–B and Pd–Ni–B were confirmed by the X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS) showed that some of the electrons were transferred from B to Pd, which makes Pd electron-enriched. Hydrogen temperature programmed desorption (H 2 -TPD) tests indicated that desorption peaks of the amorphous alloys shifted to higher temperatures with respect to Pd/C, indicating that hydrogen was more strongly bonded to the amorphous alloys. Their catalytic performances were evaluated in hydrogenation of nitroaromatic compounds. In hydrogenation of p -chloronitrobenzene ( p -CNB), the Pd–Ni–B nanoalloys on the functionalized AC displayed a TOF value of 8316/h, and p -CNB conversion of 98.6% with a p -chloroaniline ( p -CAN) selectivity of 94.6%. The highly active hydrogenation property of the Pd–Ni–B/C was further confirmed in reduction of α-nitronaphthalene. In addition to reduction of –NO 2 groups, partial aromatic rings were also hydrogenated over the Pd–Ni–B/C. The substrate conversion was 99.6% together with a highest TOF value of 88/h.

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