论文部分内容阅读
根据层状四水硫酸锆和Hβ沸石各自的催化性能和结构特点 ,设计并制备得到Hβ负载锆 (Zr Hβ)催化剂。以异丙苯歧化反应为目标体系 ,研究了Zr Hβ的催化性能。利用吡啶吸附程序升温脱附和低温氮吸附等方法研究了Zr Hβ和Hβ的表面酸性和孔结构 ,与反应性能进行关联。结果表明 ,Zr Hβ较Hβ弱酸强度更弱、强酸强度更强 ,导致其歧化反应活性较Hβ大大提高 ,歧化选择性较Hβ略有提高 ,但其初始歧化选择性较Hβ降低 ;Zr Hβ和Hβ的最可几孔径基本一致 ,因而Zr Hβ催化异丙苯歧化反应产物中间位 对位 二异丙苯的摩尔比与Hβ的基本一致
According to the catalytic properties and structural characteristics of the layered tetrasulfated zirconium sulfate and Hβ zeolite, the Hβ-supported zirconium (Zr Hβ) catalyst was designed and prepared. The cumene disproportionation reaction was taken as the target system to study the catalytic performance of Zr Hβ. The surface acidity and pore structure of Zr Hβ and Hβ were studied by pyridine adsorption procedure such as temperature-programmed desorption and low-temperature nitrogen adsorption, which were correlated with the reaction performance. The results showed that Zr Hβ was weaker than Hβ and strong acid, which led to its disproportionation activity being much higher than that of Hβ. The selectivity of disproportionation was slightly higher than that of Hβ. However, the initial disproportionation selectivity of Zr Hβ was lower than that of Hβ. The most probable pore size is basically the same, so Zr Hβ catalyzed disproportionation of cumene disproportionation product of the median para-diisopropyl benzene molar ratio and Hβ basically the same