氮掺杂碳纳米管负载的Ru和Pd催化剂上异丙醇的转化(英文)  

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

作　　者：Anas Benyounes Mohamed Kacimi Mahfoud Ziyad Philippe Serp 

机构地区：[1]Laboratory of Coordination Chemistry UPR CNRS 8241, ENSIACET Group, Toulouse University, 4 allée Emile Monso - CS 44362, Toulouse Cedex 4, France [2]Laboratory of Physical Chemistry of Materials, Catalysis and Environment (URAC26), Department of Chemistry, Faculty of Science, University of Mohammed V-Agdal, BP1014 Rabat, Morocco [3]Hassan II Academy of Science and Technology, Rabat, Morocco

出　　处：《催化学报》2014年第6期970-978,共9页

摘　　要：Ru and Pd (2 wt%) loaded on pure and on Ndoped carbon nanotubes (NCNTs) 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/NCNT (1.8 nm) < Pd/CNT (4.9 nm), and Ru/NCNT (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 NCNTs it led to both dehydration and dehydrogenation products. At 210 °C and in the presence of air, the isopropyl alcohol conversion was higher on the NCNTs (25%) than on the CNTs (11%). The Pd loaded catalysts were more active and more selective than the Ru ones. At 115 °C, 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.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, lsopropyl 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：碳纳米管 氮掺杂 异丙醇 RU Pd 氧化还原性质 钯催化剂 加载 

分 类 号：O643.36[理学—物理化学]