Release Time:2022-10-28  Hits:

Date of Publication: 2022-10-10

Journal: 催化学报

Volume: 33

Issue: 9

Page Number: 1558-1564

ISSN: 0253-9837

Abstract: High performance mordenite zeolite membranes in fluoride media with organic-free template were prepared on macroporous alpha-Al2O3 tubes by secondary growth. The seeding method was used hot dip-coating and could form a thin and compact layer. The effects of NaF content and Si/Al ratio on the morphology and pervaporation properties of the as-synthesized membranes were studied. The prepared membranes with a molar composition 6Na(2)O:1.2Al(2)O(3):30SiO(2):780H(2)O:1.5NaF for pervaporation experiments were carried out at 70 degrees C and vacuum pressure 400 Pa in a 91.5% EtOH/H2O system. The results indicated that the separation factor reached 6872 with flux 0.51 kg/(m(2).h). The H2O concentration of permeation side for pervaporation of IPA/H2O, acetic acid/H2O systems can reach 100% (limit in GC detection). The membranes almost keep high selectivity as before after acid test with 1 mol/L acetic acid in the H2O/EtOH system. The membranes may have potential applications as membrane reactors in acetic ether production with a higher transformation ratio.

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