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Photoinduced Conversion of Methane into Benzene over GaN Nanowires
- Li, Lu, Fan, Shizhao, Mu, Xiaoyue, Mi, Zetian, Li, Chao-Jun
- Journal of the American Chemical Society 2014 v.136 no.22 pp. 7793-7796
- benzene, catalysts, chemical bonding, chemical industry, hydrogen, light intensity, lighting, methane, nanowires, photocatalysis, temperature
- As a class of key building blocks in the chemical industry, aromatic compounds are mainly derived from the catalytic reforming of petroleum-based long chain hydrocarbons. The dehydroaromatization of methane can also be achieved by using zeolitic catalysts under relatively high temperature. Herein we demonstrate that Si-doped GaN nanowires (NWs) with a 97% rationally constructed m-plane can directly convert methane into benzene and molecular hydrogen under ultraviolet (UV) illumination at rt. Mechanistic studies suggest that the exposed m-plane of GaN exhibited particularly high activity toward methane C–H bond activation and the quantum efficiency increased linearly as a function of light intensity. The incorporation of a Si-donor or Mg-acceptor dopants into GaN also has a large influence on the photocatalytic performance.