L型沸石的离子交换与脱铝改性研究  

Study on the ion exchange and dealuminization of L zeolites

作　　者：陈宜俍[1] 史晓红[1] 郭士岭[1] 詹予忠[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：《工业催化》2008年第9期41-45,共5页Industrial Catalysis

摘　　要：为了改善L型沸石的催化性能,优化其在FCC中的应用,对L沸石进行离子交换和脱铝的改性研究。考察离子交换时间和离子交换方式对降低L沸石中氧化钾含量的影响及水热焙烧和化学脱铝对提高L沸石硅铝物质的量比的影响。结果表明,L型沸石离子交换时间不易过长,较适宜的时间为3 h。离子交换和水蒸汽处理相结合对降低L型沸石的钾含量更有效,离子交换和水蒸汽处理交替进行3次的样品氧化钾质量分数可降至0.82%。水热焙烧和化学脱铝能使L型沸石显著脱铝,其中,经过700℃水蒸汽处理1 h,再进行盐酸处理而制得改性L型沸石样品的硅铝物质的量比可达21.91,相对结晶度高于80%。L zeolite was modified by ion exchange and dealumination for improvement on its FCC behaviors. The influence of ion exchange time and ways on the reduction of K2O content in L zeolite and the influence of dealumination by hydrothermal and chemical methods on the increase in silica/alumina molar ratio were investigated. The results showed that the appropriate ion exchange time was 3 h. Combination of ion exchange and hydrothermal method was more effective to reduction of K2O content in L zeolite. K2O content in the zeolite modified by the combined method 3 times was reduced to 0.82%. L zeolite could be remarkably dealuminated by hydrothermal and chemical methods. Silica/alumina molar ratio of 21.91 was attained after hydrothermal treatment under 700℃ for 1 h followed by hydrochloric acid treatment, with relative erystallinity of over 80%.

关 键 词：催化化学 L型沸石改性 离子交换 焙烧 脱铝 氧化钾含量 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]