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《Chinese Journal of Catalysis》 1990-02
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STUDIES OF WO_3/γ-ALUMINA SYSTEM BY USING PASCA AND MAGNETIC MEASUREMENTS

Luo Xi-hui, Sun Wan-fu, Song Chun-fan and Li Ting-yu (Fushun Research Institute of Petroleum and Petrochemicals)  
PASCA (Positron Annihilation Spectroscopy for Chemical Analysis) and magnetic measurements were used to study the dispersion process of WO3 on γ-Al2O3 surface.The results show that the maximum monolayer dispersion of WO3 (threshold) on y-Al2O3 is 0.120 g WO3/100m2, occupying 64% of the A12O3 surface, which is considerably lower than the reported value (0.189 g/100m2). It is also found that there exist two types of surface sites: the strong sites Sk (kink sites) and the weak sites Sts (terrace and step sites), which interact with WO3 resulting in the formation of "surface interaction complexes".WO3-Sk and WO3-Sts with different stabilities. The surface of γ-Al2O3 can be divided into two main areas: the adsorbable area (A), being absolutely important for molecular adsorption and catalytic reaction, and the shadowed area (S), being away from any catalytic reaction. The ratio of A to S area depends not only upon the properties of γ-Al2O3, but also the properties of the adsorbates.
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