The antimony-rich layer created by thermal-spreading of Sb_2O_3 on Fe_2O_3 surface

摘要

The thermal-spreading of Sb_2O_3 was found to be an easy way to create an antimony-rich surface layer on metal oxides, this clean process could be used to produce or to activate the antimony-based catalysts without generation of liquid or gas waste. In prepared mixtures of Sb_2O_4 and Fe_2O_3, the antimony spreading over Fe_2O_3 surface has been investigated by SEM and XPS, etc. A model is proposed to determine the antimony concentration in the surface layer of Fe_2O_3 particles, and it is found to increase dramatically after antimony thermal-spreading treatment, e.g., in the studied mixtures of Sb_2O_4 and Fe_2O_3 with a Sb/Fe atomic ratio of approximately 0.3, the Sb/Sb+Fe x 100% achieves up to 90% in the surface layer of Fe_2O_3.