▎ 摘　　要

N-doped graphene materials were prepared from both inorganic and organic nitrogen sources and Received 15 May 2014 pyrolytic graphene oxide as the carbon substrate. Transmission electron microscopy, scanning Accepted 21 May 2014 electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were used to Published 20 June 2014 investigate the detailed growth mechanism of the N species in these N-doped graphene materials. The different chemical nature and binding energy of the different N species resulted in their different trends with annealing temperature. These N-doped graphene are excellent catalysts in the oxidation of ethylbenzene. A high yield of acetonphenone did not depend on the total nitrogen amount but only on the type of nitrogen species. Too much defects and N-dopants were detrimental to this reaction. A proper activation of the oxidant is needed to get good catalytic activity. (c) 2014, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.