Abstract: A series of MgAlCuFe complex oxides used for the removal of SOx from FCC flue gas were prepared by decomposition of MgAlCuFe hydrotalcite precursors at 700 ℃ for 6 h. The influence of different metal salts in the sulfur transfer catalyst was investigated.X-raydiffraction, thermogravimetric analysis, N2 adsorption, and infrared spectroscopy showed that all the sulfur transfer catalysts exhibited a better dispersion of metal oxides in the matrix. The results of the SO2 adsorption-reduction test showed that the novel catalyst MgAlCuFe prepared from nitrates reached 1.54 g/g of total saturation adsorption capacity in6 minunder the conditions similar to those of typical FCC. These catalysts achieved high oxidative adsorption rate, short saturation time, and large reductive capacity.

Key words: sulfur transfer catalyst, hydrotalcite-like compound, complex oxide, metal salt, sulfur oxidative adsorption, reductive desorption