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用红外光谱（ＩＲ）和Ｘ射线光电子能谱（ＸＰＳ）对用研磨法制得的（ＮＨ４）２ＳＯ４－Ｆｅ２Ｏ３样品进行了表征。并将表征结果与其催化性能关联。研究结果表明，热处理时存在着（ＮＨ４）２ＳＯ４在Ｆｅ２Ｏ３表面上自发分散过程。同时在表面形成Ｓ－Ｆｅ配合物。随着处理温度的升高，表面Ｓ－Ｆｅ配合物含量逐步增大，５７３Ｋ时达极大值。此时催化反应活性最大。超过５７３Ｋ，随着处理温度升高，表面Ｓ－Ｆｅ配合物分解，此时催化反应活性也相应降低。
The (NH4) 2SO4-Fe2O3 samples prepared by grinding method were characterized by infrared spectroscopy (IR) and X-ray photoelectron spectroscopy (XPS). And correlate the characterization results with their catalytic performance. The results show that there is spontaneous dispersion of (NH4) 2SO4 on Fe2O3 surface during heat treatment. While forming S-Fe complexes on the surface. With the increase of treatment temperature, the content of S-Fe complex gradually increased, reaching the maximum at 573K. At this point the catalytic activity of the largest. Above 573K, the surface S-Fe complexes decompose as the treatment temperature increases, and the catalytic activity decreases accordingly.