Polymer Composite Membrane with Penetrating ZIF-7 Sheets Displays High Hydrogen Permselectivity.
Angew Chem Int Ed Engl
; 58(45): 16156-16160, 2019 Nov 04.
Article
em En
| MEDLINE
| ID: mdl-31509315
ABSTRACT
Oriented and penetrating molecular sieving membranes display enhanced separation performance. A polyimide (PI) solution containing highly dispersed ZIF-7(III) sheets in CHCl3 was deposited on a glass side and subjected to flat-scraping with a membrane fabricator. In this way we developed a novel oriented and penetrating ZIF-7@PI mixed matrix membrane (MMM) with 50â
wt. % ZIF-7 loading. Because the height of the ZIF-7 sheets (5â
µm) is higher than the film thickness, every ZIF-7 sheet penetrates both surfaces of the polyimide film. Since the ZIF-7 channels are the dominant pathway for gas permeation, the ZIF-7@PI MMM displays a high molecular sieve performance for the separation of H2 (0.29â
nm) from larger gas molecules. At 100 °C and 2â
bar, the mixture separation factors of H2 /CO2 and H2 /CH4 are 91.5 and 128.4, with a high H2 permeance of about 3.0×10-7 â
mol m-2 s-1 Pa-1 , which is promising for hydrogen separation by molecular sieving.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
China