CHA-type zeolite SAPO-34 membranes were synthesized on a tubular porous α-alumina support using a secondary growth method and evaluated for the separation of water/acetic acid mixtures by vapor permeation. The effects of SiO2 molar fraction in the preparation gel on the membrane formation process and the separation properties of SAPO-34 membranes were studied. The SiO2 molar fraction in the synthesis gel substantially influenced the separation properties of prepared membranes. The membrane synthesized using a gel with a composition of 1.0 Al2O3:0.9 H3PO4:0.6 SiO2:0.8 TEAOH:100 H2O demonstrated a high separation factor of 140 with water permeance of 2.2 x 10-7 mol/m-s-Pa. Prepared SAPO-34 membranes showed resistance against acetic acid.
ASJC Scopus subject areas
- 化学 (全般)