Citation:
Chen Dong-Liang, Hu Yu-Hai, Chen Yi, Zhang Xin-Yi, Wei Shi-Qiang. Monolayer Dispersive CuO/γ-Al2O3 Catalyst Studied by XAFS[J]. Acta Physico-Chimica Sinica,
;2003, 19(06): 519-522.
doi:
10.3866/PKU.WHXB20030608
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The local structures of monolayer dispersive CuO/γ-Al2O3 catalysts prepared by means of impregnation have been investigated by XAFS technique.For the CuO/γ-Al2O3 sample with CuO loading 0.4 mmol/100 m2 lower than the monolayer dispersion threshold,the XAFS results indicate that only the first coordination shell appears in the radial distribution function of Cu atoms,and that the RCu-O and coordination number in the first shell are 0.195 nm and 4,respectively.Hence,we consider that the CuO active species on the surface of γ-Al2O3 are in the form of isolated atomic cluster ().Small amount of CuO nano-grains is formed onto the surface of γ-Al2O3 while the CuO loading is just equal to the threshold 0.8 mmol/100 m2.For sample with CuO loading of 1.2 mmol/100 m2,the local structure of Cu atom in CuO/γ-Al2O3 is similar to that of CuO powder.On the basis of the XAFS results,a monolayer dispersion model of CuO/γ-Al2O3 catalysts has been proposed.
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