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Effects of exposure to water and ethanol on silicalite-1 membranes
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0003-1053-4623
2008 (engelsk)Inngår i: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 313, nr 1-2, s. 120-126Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The effects of long exposures to ethanol, water and 0.1 M aqueous solutions of ammonia, sodium hydroxide, tetrapropylammonium hydroxide (TPAOH) and hydrochloric acid on thin TPA-silicalite-1 membranes were studied. Single gas permeation experiments, porosimetry and scanning electron microscopy were used to characterize the membranes. It was found that a short exposure (24 h) will only dissolve synthesis residues and will not affect membrane quality negatively. The only medium that had an effect after 24 h was sodium hydroxide, which almost dissolved the film completely. After exposing TPA-silicalite-1 membranes for 30 days in the various liquids, the membrane quality decreased in the order ethanol < 0.1 M hydrochloric acid < 0.1 M TPAOH < water < 0.1 M ammonia < 0.1 M sodium hydroxide due to dissolution of the silicalite-1 crystals. This study has shown that prolonged exposure to aqueous solutions will lead to dissolution of silicalite-1 crystals causing an increase in micro- and mesopores in the film. The amount and size of the pores will depend on the pH of the aqueous medium. Higher pH gives a higher dissolution and hence more non-zeolitic pores in the silicalite-1 film. Ethanol has no effect on the dissolution of the zeolite film even after 30 days. This finding has an effect in membrane preparation and in several membrane applications such as pervaporation and separation of hydrocarbons isomer mixtures.

sted, utgiver, år, opplag, sider
2008. Vol. 313, nr 1-2, s. 120-126
HSV kategori
Forskningsprogram
Kemisk teknologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-15700DOI: 10.1016/j.memsci.2007.12.070ISI: 000255208900013Scopus ID: 2-s2.0-40849106142Lokal ID: f3ece7c0-0fa6-11dd-ab53-000ea68e967bOAI: oai:DiVA.org:ltu-15700DiVA, id: diva2:988675
Merknad

Validerad; 2008; 20080421 (bajo)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2021-10-15bibliografisk kontrollert

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