碱源对MCM-22分子筛合成的影响  

The Influence of Different Base Sources on MCM-22 Zeolite Synthesis

作　　者：史建公[1] 卢冠忠[2] 曹钢[3] 

机构地区：[1]中国石化催化剂北京燕山分公司,北京102400 [2]华东理工大学工业催化研究所,上海200237 [3]中国石化北京燕山分公司,北京102500

出　　处：《中外能源》2011年第11期78-84,共7页Sino-Global Energy

基　　金：国家"973"重大科技攻关项目资助;项目编号:2004C671950000

摘　　要：研究了氧化铝在碱性环境中的溶解热力学,在n(SiO2)/n(Al2O3)=60、n(H2O)/n(SiO2)=24.5、n(HMI)/n(SiO2)=0.1的条件下,分别以NaOH、KOH和Ba(OH)2为碱源合成分子筛。以NaOH为碱源、当n(Na+)/n(Al2O3)的比值小于0.049时,合成产物为无定型物;当该比值大于等于0.049、小于等于0.123时,合成产物为MCM-22分子筛;而当该比值等于0.245时,合成产物转化为ZSM-35分子筛。以KOH为碱源时,在研究的范围内,即n(K+)/n(SiO2)的比值在0.0031～0.0873范围内时,合成产物均为无定型物。以Ba(OH)2为碱源,当n(Ba2+)/n(SiO2)的比值小于等于0.0031时,合成产物为无定型物;当该比值大于等于0.0062、小于等于0.0488时,合成产物均为Ba-ZSM-35分子筛,且结晶度随该比值的升高而逐渐降低。在一定条件下,Na+的存在对MCM-22分子筛的合成是必不可少的。This article analyzes the thermodynamics of alumina dissolution in alkaline solution.Researchers synthesized zeolites using NaOH,KOH and Ba（OH）2 as alkali sources respectively with n（SiOE）/n（Al2O3）=60,n （HEO）/n（SiO2）=24.5 and n（HMI）/n（SiO2）=0.1.When NaOH was used as the alkali source and n（Na＋）/n（Al2O3）〈 0.049,the synthetic product was amorphous,and the product was MCM-22 zeolite when 0.049≤n （Na^＋）/n （Al2O3） ≤0. 123.The product obtained was ZSM-35 zeolite, however, when n （Na^＋）In （Al2O3）=0.245.When KOH was used as the alkali source and within the range of research,i.e.n（K^＋）/n（SiO2）=0.0031-0.0873,the products were all amorphous.When Ba （OH）2 was used as the alkali source and n （Ba^2＋）/n （SiO2）≤0.0031,the product was amorphous.When 0.0062≤n （Ba2＋）/n （SiO2）≤0.0488,all the products synthesized were Ba-ZSM-35 zeolites,and the crystallinity of Ba-ZSM-35 decreases with the increase of the value of n（Ba^2＋）/n（SiO2）.The results showed that Na^＋ is essential to the synthesis of MCM-22 zeolite under certain conditions.

关 键 词：碱源 MCM-22分子筛 水热合成 氧化铝 六亚甲基亚胺 热力学 

分 类 号：O643.36[理学—物理化学]