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利用脉冲色谱技术,结合程序升温脱附法(TPD),以甲苯歧化和异丙苯裂化为指示反应,用吡啶和位阻吡啶为碱性毒剂,考察了缺铝丝光沸石(ADHM)催化剂表面酸性质,探讨了反应条件下表面酸性、强度分布与其活性的关系,得出了甲苯歧化和异丙苯裂化是受不同酸中心催化的结果。
The effects of toluene disproportionation and cumene cracking on the indicated reaction were investigated by pulse-chromatographic techniques coupled with temperature-programmed desorption (TPD). The surface acidity of ADHM catalyst was investigated using pyridine and hindered pyridine as basic toxicants The relationship between the surface acidity and the intensity distribution under the reaction conditions was discussed. The results showed that toluene disproportionation and cumene cracking were catalyzed by different acid sites.