Nanoceria supported cobalt(0) nanoparticles: a magnetically separable and reusable catalyst in hydrogen generation from the hydrolysis of ammonia borane


AKBAYRAK S., TANEROĞLU O. , ÖZKAR S.

NEW JOURNAL OF CHEMISTRY, cilt.41, ss.6546-6552, 2017 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 41 Konu: 14
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1039/c7nj01035d
  • Dergi Adı: NEW JOURNAL OF CHEMISTRY
  • Sayfa Sayısı: ss.6546-6552

Özet

Cobalt(0) nanoparticles supported on nanoceria (Co-0/CeO2) were prepared from the reduction of cobalt(II) ions impregnated on the surface of ceria nanopowders. The magnetic Co-0/CeO2 catalyst could be isolated from the reaction solution by using a magnet and characterized by using ICP-OES, XRD, TEM, EDX, BET and XPS techniques. The results reveal that cobalt nanoparticles with particle sizes in the range between 3.5 and 6.0 nm were successfully anchored on the surface of nanoceria. Co-0/CeO2 is a magnetically separable and reusable catalyst in hydrogen generation from the hydrolysis of ammonia borane retaining its initial catalytic activity (TOF = 7.0 min(-1)) even after the fifth use. For comparison, other non-noble metal nanoparticles were also supported on nanoceria. Ni-0/CeO2 and Cu-0/CeO2 provide TOF values of 1.7 min(-1) and 1.5 min(-1), respectively, while Fe-0/CeO2 is catalytically silent in the hydrolysis of ammonia borane at room temperature. The work reported here also includes the results of a kinetic study of the catalytic hydrolysis of ammonia borane depending on the temperature and catalyst concentration.