稀土含量(La)对USY分子筛性能及其焦炭选择性的影响  

Influence of the rare earth content(La) on the performance and coke selective of USY molecular sieve

作　　者：唐莉[1,2] 朱学梅[1,2] 孙雪芹 高雄厚 刘丛华 张亮[1,2] 

机构地区：[1]兰州交通大学化工学院,甘肃兰州730070 [2]中国石油兰州化工研究中心,甘肃兰州730060

出　　处：《应用化工》2012年第9期1661-1663,共3页Applied Chemical Industry

摘　　要：采用XRD、固定床微反装置、快速精密定炭仪研究了用高温水蒸气法及稀土LaCl3改性NaY分子筛后分子筛的稳定性、活性及其焦炭选择性。结果表明,随着USY分子筛La含量的增加,其晶胞常数增大,活性增加,结晶度减小,老化后的533峰保留率降低,结晶度的降低并不是真正意义上的分子筛减少,而是稀土干扰导致的。综合比较稀土含量和晶胞的作用,可知晶胞大小可能是影响稳定性的最主要因素,而后才是稀土的影响。La含量增加,积炭含量增加,其焦炭选择性变差。The techniques such as XRD, MAT, the rapid precision instrument for carbon were used to in- Vestigate the stability, activity and selectivity coke of the NaY molecular sieve modified with high tempera- ture steam method and rare earth. The results showed that with the increase of the content of La, the crys- tal cell constant and activity of molecular sieve are all increased;the crystaUinity and the 533 peak after aging of molecular sieve are all decreased. The crystallinity of molecular sieve decreased, which does not means molecular sieve decreased, but it＇ s rare earth interference. Comprehensive comparison the influ- ence of rare earth content with crystal cell on the stability of molecular sieve, it can be seen that the crys- tal cell size may be the most important factor, and then it＇ s the rare earth. With the increased of La con- tent, the carbon content increased, and the coke selective becomes poor.

关 键 词：USY分子筛 稀土La 性能 焦炭选择性 

分 类 号：TE621[石油与天然气工程—油气加工工程] TE6