摘要
采用XRD特征峰高加和法测定了5A分子筛样品的相对结晶度,并与正己烷吸附量进行了关联。研究了8种有机添加剂在较小添加量情况下对A型分子筛晶化过程、5A分子筛吸附性能和晶体尺寸的影响。结果表明:晶化过程中样品的相对结晶度与正己烷吸附量线性相关。K12、TWEEN-80和PEG使诱导期缩短,而TEA和SCMC使诱导期延长。K12、CTAB、TEA、TWEEN-80、PEG、OP和HMTA的加入均不同程度地降低了晶体生长速率。K12、CTAB、TEA、TWEEN-80、OP和HMTA有助于增加A型晶体在晶化体系中的稳定性。SCMC的加入使5A分子筛吸附速率增加。TEA、PEG和HMTA的加入使晶体尺寸增加且分布变窄。
The influences of eight organic additives on the crystallization behaviors and the properties of Zeolite A were studied. Results show that the amount of n hexane adsorption is linearly dependent on the relative crystallinity. K12, TWEEN-80 and PEG would shorten the inducing period of crystal growth and TEA and SCMC prolong the inducting stage. K12, CTAB, TEA, TWEEN-80, PEG,OPand HMTA are found to hinder the crystal growth. The stability of the crystals increases when K12, CTAB, TEA, TWEEN-80, OP or HMTA was added. SCMC would increase the rate of adsorption, while TEA,PEG and HMTA would increase the crystal size and decrease the size distribution.
出处
《华东理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第2期172-177,共6页
Journal of East China University of Science and Technology
关键词
有机添加剂
XRD
吸附量
晶化过程
晶体尺寸
organic additives
XRD
adsorption amounts
crystallizing process
size of crystals
