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《Chinese Journal of Catalysis》 1991-01
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Ni Yue-qin, Zang Jing-ling and Zhang Ji-ren(Dalian Institute of Chemical Physics, Academia Sinica, Dalian 116023)  
The physical state and chemical structure of Mo species in Mo/ A12O3 catalyst as well as their change by sulfidation have been investigated by nitrogen physical adsorption, ultraviolet-diffuse reflectance spectra and low temperature oxygen chemisorption (LTOC). It is found that when MoO3 content is less than 10%, Mo species supported on A12O3 are in monolayer deposition and the Mo(T) species predominates; when MoO3 content is more than 10%,the polylayer deposition containing Mo(O) species takes place. After sulfidation there occurs expansion of pore on Mo/Al2O3. The degree of expansion is inversely proportional to MoO3 content. LTOC results show that moderate degree of reduction and the interaction between r-Al2O3 and Mo(T) species are favourable to the formation of coordinately unsaturated Mo ions.
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