2H NMR studies of binary adsorption in silicalite
2H NMR studies of binary adsorption in silicalite
复制标题
DOI：
10.1039/ft9959100963
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
R. Portsmouth;L. Gladden;M. Duer
中科院分区：
文献类型：
--
作者：
R. Portsmouth;L. Gladden;M. Duer
本文首次报道了苯-对二甲苯和苯-环己烷在沸石-硅沸石上的二元吸附的~2H核磁共振研究。结果表明，第二组分的共吸附显著影响了纯苯在相同硅沸石结构中的吸附特性。对硅沸石中苯和对二甲苯等摩尔二元混合物的研究表明，苯和对二甲苯在各自的单组分吸附过程中访问最有利的位置，两种物种沿着沸石结构的直线通道形成被吸附物种的链。相反，苯和环己烷的混合物表现出竞争吸附现象。较大的环己烷分子优先进入硅沸石骨架内的直线通道，从而迫使通常会访问相同吸附位置的苯分子占据正弦通道和通道交叉点内的位置。
This paper reports the first 2H NMR studies of the binary adsorption of benzene–p–xylene and benzene–cyclohexane in the zeolite silicalite. The results demonstrate that the co-adsorption of a second component significantly influences the adsorption characteristics associated with pure benzene adsorbed within the same silicalite structure. Studies of equimolar, binary mixtures of benzene and p-xylene in silicalite indicate that benzene and p-xylene access the sites most favoured during the respective single-component adsorption process, with the two species forming chains of sorbed species along the straight channels of the zeolite structure. In contrast, mixtures of benzene and cyclohexane demonstrate the phenomenon of competitive adsorption. The larger cyclohexane molecules preferentially enter the straight channels within the silicalite framework, thereby forcing the benzene molecules, which would normally access the same adsorption sites, to take up positions in sites within the sinusoidal channels and channel intersections.