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《Chinese Journal of Catalysis》 1995-01
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CHARACTERIZATION OF Cu~(+) SITES ON Cu-ZSM-5 BY CO ADSORPTION INFRARED SPECTROSCOPY

Wang, Bi-xun and Fu, Yi-lu(Department of Chemical Physics, University of Science and Technology of China, Hefei 230026)  
CO is used as a probe molecule to investigate the characteristics of Cu-ZSM-5 with different exchange degrees under different pretreatment conditions by means of infrared spectroscopy. The experimental results indicate that: Cu~(2+) in Cu-ZSM-5 can be reduced to Cu~+ to some extent under evacuation and heating conditions. There are two kinds of Cu~+ site (S1 and S1 ) in Cu-ZSM-5. The redox property of Cu~+ at the two kinds of site is different from each other. Cu~+ on S1 is thermodynami-cally more stable and Cu~+ on S1 is easier to be oxidized and reduced. The Cu~+ -CO surface species located on S1 can gradually migrate to S1 at room temperature. The equilibrium of Cu~+ -CO surface species on the two kinds of site can be reached at higher temperature. The structure of the two kinds of site is also discussed.
【Fund】: 国家自然科学基金资助项目.
【CateGory Index】: O643.3
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