Highly efficient cobalt-doped carbon nitride polymers for solvent-free selective oxidation of cyclohexane

• 作者: Guanzhong Lu Wangcheng Zhan Yanglong Guo Yu Fu Yun Guo Yunsong Wang
• 来源期刊: 绿色能源与环境：英文版
• 学科: 化学
• 年，卷（期）: 2017,（2）
• 页码范围: 142-150
• 页数: 9页
• 分类号: O643.36

摘要

Selective oxidation of saturated hydrocarbons with molecular oxygen has been of great interest in catalysis, and the development of highly efficient catalysts for this process is a crucial challenge. A new kind of heterogeneous catalyst, cobalt-doped carbon nitride polymer（g-C3N4）,was harnessed for the selective oxidation of cyclohexane. X-ray diffraction, Fourier transform infrared spectra and high resolution transmission electron microscope revealed that Co species were highly dispersed in g-C3N4 matrix and the characteristic structure of polymeric g-C3N4 can be retained after Co-doping, although Co-doping caused the incomplete polymerization to some extent. Ultraviolet-visible, Raman and X-ray photoelectron spectroscopy further proved the successful Co doping in g-C3N4 matrix as the form of Co（Ⅱ）-N bonds. For the selective oxidation of cyclohexane, Co-doping can markedly promote the catalytic performance of g-C3N4 catalyst due to the synergistic effect of Co species and gC3N4 hybrid. Furthermore, the content of Co largely affected the activity of Co-doped g-C3N4 catalysts, among which the catalyst with 9.0 wt%Co content exhibited the highest yield（9.0%） of cyclohexanone and cyclohexanol, as well as a high stability. Meanwhile, the reaction mechanism over Co-doped g-C3N4 catalysts was elaborated.