固体（NH_4）_2SO_4－Fe_2O_3体系的IR研究

本文用真空红外光谱、吡啶吸附红外光谱对不同温度下用浸渍法制得的（ＮＮ＿４）＿２ＳＯ＿４－Ｆｅ＿２Ｏ＿３样品进行了研究，并与催化性能作了关联。研究结果表明，热处理时在表面形成与酸性有关的Ｓ－Ｆｅ配合物，且随着处理温度的升高配合物的含量不断增大，至５７３Ｋ时含量及反应活性达最大值；超过５７３Ｋ时，随着处理温度升高而配合物分解，反应活性也相应地降低．

IR Investigation of Solid Mixture of(NH_4)_2 SO_4 and Fe_2O_3

NH_4)_2SO_4-Fe_2O_3 samples, prepared by impregnating and calcining at differenttemperatures,were observed using IR spectroscopy.The resuIts from the observation werecorrelated with the catalytic performance of the samples. It was found that a kind of surfaceS-Fe coordination complex was formed upon the thermal treatment.First,the amount ofthe complex increased with increasing treatment temperature. Wlien the temperature reached573 K,the amount of S-Fe coordination complex had a maximum. In this case the catalyticactivity of the sample was Hghest. When the temperature was ever 573 K,the surface S-Fecoordination complex decomposed gradually with increasing treatment temperature further,and simtiltaneously the catalytic activity of the samples decreased correspondingly.