• 文献标题:   Graphene-oxide-supported CuAl and CoAl layered double hydroxides as enhanced catalysts for carbon-carbon coupling via Ullmann reaction
  • 文献类型:   Article
  • 作  者:   AHMED NS, MENZEL R, WANG YF, GARCIAGALLASTEGUI A, BAWAKED SM, OBAID AY, BASAHEL SN, MOKHTAR M
  • 作者关键词:   layered double hydroxide s, graphine oxide, ullmann homocouplig reaction
  • 出版物名称:   JOURNAL OF SOLID STATE CHEMISTRY
  • ISSN:   0022-4596 EI 1095-726X
  • 通讯作者地址:   King Abdulaziz Univ
  • 被引频次:   14
  • DOI:   10.1016/j.jssc.2016.11.024
  • 出版年:   2017

▎ 摘  要

Two efficient catalyst based on CuAl and CoAl layered double hydroxides (LDHs) supported on graphene oxide (GO) for the carbon-carbon coupling (Classic Ullmann Homocoupling Reaction) are reported. The pure and hybrid materials were synthesised by direct precipitation of the LDH nanoparticles onto GO, followed by a chemical, structural and physical characterisation by electron microscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), surface area measurements and X-ray photoelectron spectroscopy (XPS). The GO supported and unsupported CuAl-LDH and CoAl-LDH hybrids were tested over the Classic Ullman Homocoupling Reaction of iodobenzene. In the current study CuAl- and CoAl-LDHs have shown excellent yields (91% and 98%, respectively) at very short reaction times (25 min). GO provides a light-weight, charge complementary and two-dimensional material that interacts effectively with the 2D LDHs, in turn enhancing the stability of LDH. After 5 re-use cycles, the catalytic activity of the LDH/GO hybrid is up to 2 times higher than for the unsupported LDH.