论文部分内容阅读
用离子静电势、弱酸中毒法及红外光谱法表征了交换型和浸渍型碱金属离子沸石的酸碱性,并将其与对二甲苯-甲醇的侧链烷基化反应的活性和选择性相关联。结果表明,反应活性和选择性与催化剂酸碱性之间有较好的关系。Rb~+,Cs~+浸渍的LiX,NaX,KX沸石,通过Rb~+,Cs~+离子与体系的相互作用,被“诱发”成为有明显碱性功能的沸石催化剂。从红外光谱观察到碱金属离子沸石有一定强度的碱中心吸收带。还观察到LiX,NaX沸石上的呲啶吸附中心。
The acidity and basicity of the exchangeable and impregnated alkali metal ion zeolites were characterized by ion electrostatic potential, weak acidosis and infrared spectroscopy and correlated with the activity and selectivity of side-chain alkylation of p-xylene-methanol United The results show that there is a good relationship between the reactivity and selectivity and the acidity and basicity of the catalyst. LiX, NaX, KX zeolite impregnated with Rb ~ +, Cs ~ + is “induced” into a zeolite catalyst with obvious basic function through the interaction of Rb ~ + and Cs ~ + ions with the system. Alkali metal ion zeolites have a certain intensity of alkali absorption bands observed from infrared spectroscopy. Pyridine adsorption centers on LiX, NaX zeolites were also observed.