催化学报 ›› 2014, Vol. 35 ›› Issue (12): 1944-1954.DOI: 10.1016/S1872-2067(14)60181-9

• 论文 • 上一篇    下一篇

Size dependence of photocatalytic oxidation reactions of Rh nanoparticles dispersed on (Ga1-xZnx)(N1-xOx) support

Yi Zhang, D. A. J. Michel Ligthart, Peng Liu, Lu Gao, Tiny M. W. G. M. Verhoeven, Emiel J. M. Hensen   

  1. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
  • 收稿日期:2014-05-15 修回日期:2014-06-26 出版日期:2014-11-29 发布日期:2014-11-29
  • 通讯作者: Emiel J. M. Hensen

Size dependence of photocatalytic oxidation reactions of Rh nanoparticles dispersed on (Ga1-xZnx)(N1-xOx) support

Yi Zhang, D. A. J. Michel Ligthart, Peng Liu, Lu Gao, Tiny M. W. G. M. Verhoeven, Emiel J. M. Hensen   

  1. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
  • Received:2014-05-15 Revised:2014-06-26 Online:2014-11-29 Published:2014-11-29

摘要:

Mixed Ga-Zn oxynitrides were synthesized using coprecipitation, wet-precipitation, and solid-solution methods. The oxynitrides were used as supports for Rh nanoparticle catalysts in photocatalytic water splitting, CO oxidation, and H2 oxidation. Mixed Ga-Zn oxynitrides produced by wet precipitation and nitridation had good visible-light-absorption properties and high surface areas, so they were used to support uniformly sized poly(vinylpyrrolidone)-stabilized Rh nanoparticles. The nanoparticle size range was 2-9 nm. These catalysts had negligible activity in photocatalytic H2 production by water splitting with methanol as a sacrificial agent. Other mixed Ga-Zn oxynitrides were also inactive. A reference sample provided by Domen also showed very low activity. The influence of particle size on Rh-catalyzed oxidation of CO and H2 was investigated. For CO oxidation, the activities of small particles were higher for particles with higher Rh oxidation degrees. The opposite holds for H2 oxidation.

关键词: Oxynitride, Rhodium nanoparticle, Water splitting, Carbon monoxide oxidation, Hydrogen oxidation

Abstract:

Mixed Ga-Zn oxynitrides were synthesized using coprecipitation, wet-precipitation, and solid-solution methods. The oxynitrides were used as supports for Rh nanoparticle catalysts in photocatalytic water splitting, CO oxidation, and H2 oxidation. Mixed Ga-Zn oxynitrides produced by wet precipitation and nitridation had good visible-light-absorption properties and high surface areas, so they were used to support uniformly sized poly(vinylpyrrolidone)-stabilized Rh nanoparticles. The nanoparticle size range was 2-9 nm. These catalysts had negligible activity in photocatalytic H2 production by water splitting with methanol as a sacrificial agent. Other mixed Ga-Zn oxynitrides were also inactive. A reference sample provided by Domen also showed very low activity. The influence of particle size on Rh-catalyzed oxidation of CO and H2 was investigated. For CO oxidation, the activities of small particles were higher for particles with higher Rh oxidation degrees. The opposite holds for H2 oxidation.

Key words: Oxynitride, Rhodium nanoparticle, Water splitting, Carbon monoxide oxidation, Hydrogen oxidation