Citation:
Piao Xingying, Wang Jixiang, Xie Xiaofan. CHARACTERISTICS OF SURFACE OXYGEN IN Fe-Sb OXIDE AND ADSORPTION OF NH3[J]. Chinese Journal of Applied Chemistry,
;1984, 1(4): 45-49.
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The TPD of surface oxygen of Fe2O3, Sb2O4 and other five mixed oxides with atom ratio Sb/Fe from 1/9 to 9/1 have been investigated. A small amount of oxygen is desorbed from Fe2O3 at 200-450℃ while for Sb2O4 the desorption peak of oxygen appears after 700℃ and in the case of mixed oxides both α and β oxygen are found to be during TPD after 400℃. It is found that the activation energy of desorption of a oxygen increases with the increase of Sb content and that α oxygen is more reactive than β oxygen for the oxidation of propylene. It is shown also that NH3 adsorption sites are of different strength depending on the content of α and β oxygen in Fe-Sb oxide. It is concluded that suitable bonding strength of surface oxygen in Fe-Sb oxides should be the main cause of high activity and selectivity in the ammoxidation of propylene.
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