异丙苯在不同硅含量SAPO-5分子筛上的裂化反应特征  

The Features of Cumene Cracking Reaction on SAPO-5 Molecular Sieves with Varying Si Contents

作　　者：高大维[1] 赵天琦[1] 黄彦[1] 孙铁[1] 杨胥微[1] 

机构地区：[1]吉林大学化学系,长春130023

出　　处：《吉林大学自然科学学报》1997年第1期79-82,共4页Acta Scientiarum Naturalium Universitatis Jilinensis

摘　　要：在ESR－GC－Computer联机的动态装置下，用固定床微型石英催化反应器，研究不同硅含量SAPO－5（22），SAPO－5（19），SAPO－5（5）及AlPO4－5和HY分子筛对异丙苯裂化反应的催化活性、ESR幅值特征．并测定催化剂的积炭量．结果表明，催化剂的催化活性、ESR幅值及积炭量大小之排序一致，均为HY》SAPO－5（22）＞SAPO－5（19）＞SAPO－5（5）》AlPO4－5．在SAPO－5和AlPO4－5催化剂上，异丙苯反应前后吸附吡啶的IR谱证实，异丙苯在SAPO－5催化剂上的裂化反应是在B酸中心进行的．The feature of catalytic activity and ESR amplitude of SAPO-5 (22), SAPO-5 (19),SAPO-5(5), AlPO4-5 and HY molecular sieves were studied for cumene cracking reaction at 450℃ ina fixed-bed micro-type quartz reactor under the condition of dynamic state by means of combined ESRGC-computer. The coke contents of the above mentioned catalysts were determined using TG-DTA.The results show that the order of catalytic activity of the catalysts is in accordance with those of ESRamplitude and coke contents as follows: HY>>SAPO-5 (22)>SAPO-5 (19)>SAPO-5(5)>>AlPO4-5.The features of IR spectra of pyridine adsorbed on SAPO-5 and AlPO4-5 before and after cumenecracking reaction were observed. It was proved that the cumene cracking reaction was carried out onthe Bronsted acid sites in SAPO-5 catalyst.

关 键 词：异丙苯 裂化反应 磷酸硅铝 分子筛 硅 

分 类 号：O625.11[理学—有机化学]