Abstract
The local structures of supported CuO/ γ-Al 2O 3 monolayer dispersive catalysts with different CuO loadings have been investigated by EXAFS and multiple scattering XANES simulations. The EXAFS results show that the first nearest neighbors around the Cu atoms in the CuO/ γ-Al 2O 3 catalysts are similar to that of the polycrystalline CuO powder, which is independent of the CuO loadings. Moreover, the Cu K-XANES FEFF8 calculations for CuO reveal that the monolayer-dispersed CuO species are of small distorted (CuO 4) m n+ clusters, which is mainly composed of a distorted CuO 6 octahedron incorporated in the surface octahedral vacant sites of the γ-Al 2O 3 support. We consider that the CuO species for the CuO/ γ-Al 2O 3 catalysts with loadings of 0.4 and 0.8 mmol/100 m 2 are distorted (CuO 4) m n+ clusters composed mainly of a distorted CuO 6 octahedron incorporated in the surface octahedral vacant sites of the γ-Al 2O 3 support after calcinations at high temperature in air for a few hours. On the contrary, for the CuO/ γ-Al 2O 3 with loading of 1.2 mmol/100 m 2, the local structure of Cu atoms in CuO/ γ-Al 2O 3 is similar to that of polycrystalline CuO powder.
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