高校化学工程学报Issue(1)：32-37,6.DOI:10.3969/j.issn.1003-9015.2013.01.006
正己烷在成型无黏结剂5A分子筛上脱附特性研究
Desorption Characteristic of n-Hexane Adsorbed on Binder-free 5A Zeolites
摘要
Abstract
The crystal structures of binder-free 5A zeolite pellets (5A-1, 5A-6) were determined by XRD, and the results show that the 5A-1 and 5A-6 zeolite pellets have strong XRD characteristic peaks of 5A zeolite and no other miscellaneous peak. The relative crystallinity of 5A-1 zeolite is 64% compared to that of the 5A-6 zeolite. The apparent desorption activation energy and desorption parameters of n-hexane adsorbed on binder-free 5A zeolite pellets were studied by thermo gravimetric differential analyzer (TG-DTA). The helium purging desorption curves of n-hexane adsorbed on 5A-1 and 5A-6 zeolite pellets were studied by a dynamic adsorption and desorption experimental equipment. The TG-DTA profiles of n-hexane adsorbed on 5A-1 and 5A-6 zeolite pellets show two desorption peaks:the activation energies of the first desorption peak on 5A-1 and 5A-6 zeolite pellets are 33.44 kJ⋅mol−1and 39.35 kJ⋅mol−1, respectively, while the activation energies of the second desorption peak are 52.21 kJ⋅mol−1 and 67.48 kJ⋅mol−1, respectively. The suitable desorption temperatures of n-hexane adsorbed on 5A-1 and 5A-6 zeolite pellets all exceed 200℃. The n-hexane adsorbed on 5A-1 and 5A-6 zeolite pellets can completely desorbed by being purged with helium at 200℃, and the 5A-1 zeolite pellet has better desorption performance than that of 5A-6.关键词
正己烷/成型无黏结剂5A分子筛/脱附活化能/氦气/吹扫Key words
n-hexane/binder-free 5A zeolite/desorption activation energy/helium/sweep分类
化学化工引用本文复制引用
杜旭东,唐芸,崔群,王海燕,姚虎卿..正己烷在成型无黏结剂5A分子筛上脱附特性研究[J].高校化学工程学报,2013,(1):32-37,6.基金项目
国家自然科学基金(20876074) （20876074）
中石化项目(J106002) （J106002）
