离子交换对L沸石的钾含量及酸性质的影响  

Effects of Ion Exchange for Zeolite L on the Potassium Content and Acidity

作　　者：陈宜俍[1] 史晓红[1] 郭士岭[1] 秦建昭[1] 徐军[1] 詹予忠[1] 孙绍辉[1] 赵俊红[1] 

机构地区：[1]郑州大学化工学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2007年第4期24-27,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省科技攻关计划资助项目(0424220182)

摘　　要：为优化L沸石在石油催化裂化中的应用,以不同的离子交换方式对L沸石进行改性.并考察了不同的离子交换方式对降低L沸石钾含量的影响,以及改性后L沸石酸性质的变化.结果表明,离子交换和水蒸汽处理相结合对降低L沸石的钾含量更为有效,经过三次离子交换和三次水蒸汽处理的L沸石样品氧化钾含量可降至0.82%.NH3-TPD程序升温脱附实验结果表明改性后的L沸石表面酸中心的强度提高,酸强度分布变宽,总酸量下降.从红外吡啶吸附谱图可以看出改性后L沸石表面出现了B酸中心和L酸中心.Zeolite L was modified by various ion exchanges to improve its use in the FCC. The effects of various ion exchanges on reducing the K20 content and the changing of acidity of zeolite L were investigated. It was found that the combined use of ion exchanges with thermal treatments can reduce the potassium content of zeolite L remarkabl.y . The K20 of the modified zeolite which was treated by this method was reduced to 0. 82%. The results of the NH3 - TPD showed that the acid intensity increased, the acid distribution extended and the total acid amount of modified zeolite L decreased. Bronsted acid sites and Lewis acid sites can be found in Pyridine- adsorption- IR spectrum.

关 键 词：L沸石 离子交换 氧化钾含量 酸性 酸量 酸强度 

分 类 号：O643.36[理学—物理化学]