（NH_4）_2SO_4－ZrO_2体系的热分散性质  

$$$Features of Thermal Dispersion of(NH_4)_2SO_4-ZrO_2 System

作　　者：魏长平[1] 魏诠 张武阳[1] 杨胥薇 魏乃香[1] 李荣生[1] 

机构地区：[1]吉林大学化学系,吉林工学院工作

出　　处：《吉林大学自然科学学报》1994年第4期93-96,共4页Acta Scientiarum Naturalium Universitatis Jilinensis

基　　金：国家自然科学基金

摘　　要：用红外光谱和Ｘ射线光电子能谱对研磨法制得的（ＮＨ＿４）＿２ＳＯ＿４－ＺｒＯ＿２样品进行了表征，并将表征结果与其催化性能关联。结果表明，热处理时存在着（ＮＨ＿４）＿２ＳＯ＿４在ＺｒＯ＿２表面的自发分散过程，同时形成Ｓ─Ｚｒ配合物，且随着处理温度的升高，配合物含量逐步增大，５７３Ｋ时达极大值，催化反应活性最大；超过５７３Ｋ时，表面Ｓ─Ｚｒ配合物逐渐分解，催化反应活性也相应地降低．Samples of(NH_4)_2SO_4-ZrO_2, prepared by grinding method,have been character-ized using infrared(IR )and X-ray photoelectron spectroscopy.The results fron the charac-terization are coorelated with the catalytic performance of the samples. The results showthat(NH_4)_2SO_4 disperses spontaneously on the surface of ZrO_2 during the heat treatment,forming a S一Zr coordinated compound on the surface of ZrO_2.With increasing the treat-ment temperature,the content Of the surface S一Zr coordinated compound gradually increas-es and reaches a maximum at 573 K, At this time the catalytic activity has the highest value。Above 573 K,with increasing the treatment temperature, the surface S一Zr coordinatedcompound decomposes gradually.Coorespondingly,the catalytic activity also decreases;

关 键 词：硫酸铵 氧化锆 固体酸 热处理 催化剂 

分 类 号：O643.36[理学—物理化学]