Open AccessSynthesis of silicalite-1 zeolite membranes for vapor-permeation separation of dichlorobenzene Isomers
Author(s) -
Qiuping He,
Yong Zou,
Pengfei Wang,
Xiaoming Dou
Publication year - 2021
Publication title -
nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.926
H-Index - 203
eISSN - 1361-6528
pISSN - 0957-4484
DOI - 10.1088/1361-6528/ac1d09
Subject(s) - permeation , permeance , selectivity , membrane , materials science , zeolite , chemical engineering , adsorption , gas separation , dichlorobenzene , chromatography , organic chemistry , chemistry , catalysis , biochemistry , engineering
Silicalite-1 zeolitic membranes have been successfully fabricated on the porous α -Al 2 O 3 support by templated and template-free protocol, respectively, for vapor permeation separation of dichlorobenzene (DCB) isomers. After proving the high quality of the membranes by single gas permeation (He and SF 6 ) performance, the vapor-permeation of DCB isomers over two types of the silicalite-1 membrane was then investigated. The separation results clearly indicated that under the lower partial pressure and higher temperature, the effect of DCB isomer adsorption on the permeance could be kept at a sufficiently low level and sharp selectivity become more important. Thus, high p- DCB selectivity could be achieved. Comparatively, the template-free silicalite-1 zeolite has a much higher p-DCB selectivity due to the relatively fewer inter-crystalline gaps. Under certain separation conditions, the highest selectivity of p -DCB for p- / m- DCB and p- / o- DCB binary systems could reach 165 and 113, respectively.