载钴沸石上的丙烯二聚和芳构化作用

Study on the Acidity and Catalytic Properties of Co-Loaded Zeolit E Dimerization and Arom atization

采用IR技术,研究一系列不同钴含量的ZSM-5沸石样品,结果表明,钴改性ZSM-5沸石试样,B酸下降,L酸增多,L/B比值随钴含量增加而增加。浸渍载钴沸石样品,除1545cm^(-1),1490cm^(-1),1450cm^(-1)峰外,还出现1616cm^(-1)峰,它表征一类缺电子中心,说明它在合适的微环境条件下,有利于二聚产物环化、脱氢芳构化。

A Series of different Co-content ZSM-5 was studied by IR,Potentiometric titration. The results show that B-acid decreases while L-acid increases, and L/B ratio increases with Co-content on these samples. On impregnated ones, besides 1545,1490,1450cm^(-1) bands, there is another kind of electron-deficient site characterized by 1616cm^(-1)band, which favors dehydro-cyclo——aromatization of dimer.