物理化学学报 >> 2007, Vol. 23 >> Issue (04): 503-507.doi: 10.3866/PKU.WHXB20070410

研究论文 上一篇    下一篇

ZSM-5、ZSM-57分子筛和丝光沸石间的转晶规律

刘百军; 曾贤君; 王辉; 黄永; 汪梅   

  1. 中国石油大学(北京)CNPC 催化重点实验室, 北京 102249
  • 收稿日期:2006-09-26 修回日期:2006-11-08 发布日期:2007-04-05
  • 通讯作者: 刘百军 E-mail:bjliu@cup.edu.cn

Crystal Transformation among ZSM-5, ZSM-57 andMordenite

LIU Bai-Jun; ZENG Xian-Jun; WANG Hui; HUANG Yong; WANG Mei   

  1. Key Laboratory of Catalysis of CNPC, China University of Petroleum, Beijing 102249, P. R. China
  • Received:2006-09-26 Revised:2006-11-08 Published:2007-04-05
  • Contact: LIU Bai-Jun E-mail:bjliu@cup.edu.cn

摘要: 考察了硅铝比、碱度、有机胺模板剂、晶化时间及温度等合成条件对ZSM-5、ZSM-57 分子筛和丝光沸石之间相互转晶的影响. 发现较高的碱度、较长的晶化时间有利于合成丝光沸石;较低的碱度、较高的诱导晶化温度、较长的晶化时间有利于合成低硅铝比的ZSM-57 分子筛;合成低硅铝比的ZSM-5分子筛则需要在能合成丝光沸石和ZSM-57 分子筛的碱度区间内精确调节碱度, 缩短晶化时间、降低诱导晶化温度、加入适当晶种, 有利于合成低硅铝比的ZSM-5 分子筛. 合成条件稍微改变, 会导致各种沸石之间发生转晶, 晶化产物出现两种或两种以上的晶型.

关键词: ZSM-5, ZSM-57, 丝光沸石, 转晶

Abstract: The crystal transformation among ZSM-5, ZSM-57, and mordenite was studied under different conditions, such as SiO2/Al2O3 molar ratio, alkalinity, n-butylamine template, crystallization time, and temperature. The results showed that higher alkalinity and longer crystallization time were of benefit to mordenite; lower alkalinity and higher induction temperature of crystallization were in favor of ZSM-57 with low n(SiO2)/n(Al2O3) ratio; alkalinity was required to be adjusted accurately to synthesize ZSM-5 with low n(SiO2)/n(Al2O3) ratio, shortening of crystallization time, decrease in induction temperature of crystallization, and the addition of seed crystal were all in favor of ZSM-5 with low n(SiO2)/n(Al2O3) ratio. A slight change in the above conditions would result in the transformation among the three crystals, and two or more crystal phases could be observed in the products.

Key words: Zeolite ZSM-5, Zeolite ZSM-57, Mordenite, Crystal transformation

MSC2000: 

  • O643