渗铝高硅沸石的酸性中心及其催化性能  

Acid Sites and Catalytic Performance of Aluminated HighSilica Zeolites

作　　者：吕万成[1] 陈玉玲[1] 左丽华[1] 

机构地区：[1]石油化工科学研究院

出　　处：《工业催化》1999年第3期58-63,共6页Industrial Catalysis

摘　　要：本文在高温水蒸汽条件下对ＺＳＭ－５类型的高硅沸石进行渗铝研究。通过氨吸附的酸性测定、２７Ａｌ和２９ＳｉＮＭＲＭＡＳ谱、ＸＲＤ、ＸＰＳ和ＩＲ等多种分析测试手段对高硅沸石ＨＺＳＭ－５、ＡｌＺＳＭ－５、ＫＺＳＭ－５和ＡｌＫＺＳＭ－５进行了表征，并对ＨＺＳＭ－５和ＫＺＳＭ－５渗铝前后的酸性中心变化规律进行研究。结果表明，渗铝改性后的ＡｌＺＳＭ－５总酸量的增加可达２００％，强酸部分的增加可高达８００％以上，明显地改善了ＨＺＳＭ－５的酸性性质和酸中心的高温水热稳定性。Ｃ１４裂解活性表明，渗铝后的ＡｌＺＳＭ－５裂解活性增加了７５ｗｔ％，渗铝后ＡｌＫＺＳＭ－５较渗铝前ＫＺＳＭ－５仍然保留较多的弱酸，强酸也有所增加，出现了羰基离子反应中心，与标样ＨＺＳＭ－５相比，催化裂化活性提高２０ｗｔ％左右。Alumination of ZSM5 highsilica zeolites was studied under high temperature steam condition. Aluminated highsilica zeolites were characterized by NH3 adsorption (for acidity measurement),Al and 29SiNMR,XRD,XPS and IR.Change in acid sites of HZSM5 and KZSM5 before and after alumination was also studied. Results indicated that,after modification by alumination,total acidity of AlZSM5 can be increased by 200% and strong acidity even increased by 800%,which evidently improved acid property of HZSM5 and high temperature hydrothermal stability of acid sites. C14cracking activity of AlZSM5 was increased by 75%(weight) after alumination.

关 键 词：ZSM-5 高硅沸石 渗铝 酸性 裂解 活性 催化 沸石 

分 类 号：TQ424.25[化学工程] TQ426.7