催化学报 ›› 2014, Vol. 35 ›› Issue (6): 970-978.DOI: 10.1016/S1872-2067(14)60121-2

• 研究论文 • 上一篇    下一篇

Conversion of isopropyl alcohol over Ru and Pd loaded N-doped carbon nanotubes

Anas Benyounesa,b, Mohamed Kacimib, Mahfoud Ziyadb,c, Philippe Serpa   

  1. a Laboratory of Coordination Chemistry UPR CNRS 8241, ENSIACET Group, Toulouse University, 4 allée Emile Monso-CS 44362, Toulouse Cedex 4, France;
    b Laboratory of Physical Chemistry of Materials, Catalysis and Environment (URAC26), Department of Chemistry, Faculty of Science, University of Mohammed V-Agdal, BP1014 Rabat, Morocco;
    c Hassan II Academy of Science and Technology, Rabat, Morocco
  • 收稿日期:2014-03-31 修回日期:2014-04-25 出版日期:2014-05-30 发布日期:2014-06-03
  • 通讯作者: Mohamed Kacimi, Philippe Serp

Conversion of isopropyl alcohol over Ru and Pd loaded N-doped carbon nanotubes

Anas Benyounesa,b, Mohamed Kacimib, Mahfoud Ziyadb,c, Philippe Serpa   

  1. a Laboratory of Coordination Chemistry UPR CNRS 8241, ENSIACET Group, Toulouse University, 4 allée Emile Monso-CS 44362, Toulouse Cedex 4, France;
    b Laboratory of Physical Chemistry of Materials, Catalysis and Environment (URAC26), Department of Chemistry, Faculty of Science, University of Mohammed V-Agdal, BP1014 Rabat, Morocco;
    c Hassan II Academy of Science and Technology, Rabat, Morocco
  • Received:2014-03-31 Revised:2014-04-25 Online:2014-05-30 Published:2014-06-03

摘要:

Ru and Pd (2 wt%) loaded on pure and on N-doped carbon nanotubes (N-CNTs) were prepared and tested using the isopropyl alcohol decomposition reaction as probe reaction. The presence of nitrogen functionalities (pyridinic, pyrrolic, and quaternary nitrogen) on the nitrogen doped support induced a higher metal dispersion: Pd/N-CNT (1.8 nm) < Pd/CNT (4.9 nm), and Ru/N-CNT (2.4 nm) < Ru/CNT (3.0 nm). The catalytic activity of the supports was determined first. Isopropyl alcohol conversion produces acetone on CNTs while on N-CNTs it led to both dehydration and dehydrogenation products. At 210℃ and in the presence of air, the isopropyl alcohol conversion was higher on the N-CNTs (25%) than on the CNTs (11%). The Pd loaded catalysts were more active and more selective than the Ru ones. At 115℃, the Pd catalysts were 100% selective towards acetone for a conversion of 100%, whereas the Ru catalysts led to dehydration and dehydrogenation products. The nitrogen doping induced the appearance of redox properties when oxygen is present in the reaction mixture.

关键词: Ruthenium, Palladium, Nitrogen-doped carbon nanotubes, Isopropyl alcohol, Decomposition, Acetone

Abstract:

Ru and Pd (2 wt%) loaded on pure and on N-doped carbon nanotubes (N-CNTs) were prepared and tested using the isopropyl alcohol decomposition reaction as probe reaction. The presence of nitrogen functionalities (pyridinic, pyrrolic, and quaternary nitrogen) on the nitrogen doped support induced a higher metal dispersion: Pd/N-CNT (1.8 nm) < Pd/CNT (4.9 nm), and Ru/N-CNT (2.4 nm) < Ru/CNT (3.0 nm). The catalytic activity of the supports was determined first. Isopropyl alcohol conversion produces acetone on CNTs while on N-CNTs it led to both dehydration and dehydrogenation products. At 210℃ and in the presence of air, the isopropyl alcohol conversion was higher on the N-CNTs (25%) than on the CNTs (11%). The Pd loaded catalysts were more active and more selective than the Ru ones. At 115℃, the Pd catalysts were 100% selective towards acetone for a conversion of 100%, whereas the Ru catalysts led to dehydration and dehydrogenation products. The nitrogen doping induced the appearance of redox properties when oxygen is present in the reaction mixture.

Key words: Ruthenium, Palladium, Nitrogen-doped carbon nanotubes, Isopropyl alcohol, Decomposition, Acetone