Speciation of copper on ZrO2 during the catalytic hydrogenation of CO2 has been studied by in situ extended X-ray absorption fine structural (EXAFS) spectroscopy in the present work. The EXAFS data indicated that about 3.1 nearest oxygen atoms surrounded the Cu atoms with a CuO bond distance of 1.95 Å in the calcined Cu/ZrO2 catalyst. Reduction of the catalyst in hydrogen at 573 K led to a formation of CuCu (2.56 Å) bonds with a coordination number (CN) of 5.6. Mainly CO and CH3OH were generated in the hydrogenation of CO2 catalyzed by the reduced Cu/ZrO2 catalyst at 673 K. About 76% of the Cu(0) species was oxidized to Cu(I) (27%) and Cu(II) (49%) on ZrO2 during the catalytic hydrogenation process.
|頁（從 - 到）||373-376|
|期刊||Journal of Electron Spectroscopy and Related Phenomena|
|出版狀態||Published - 2005 6月 1|
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