Facile build-up of acid-resistance layer using organosilica BTESE for
LTA zeolite membrane
Abstract
Low acid resistance of LTA zeolite membranes has restricted their wider
application in dehydration of organics. Herein, an effective and facile
route was proposed to enhance the acid stability of LTA zeolite
membrane. Organosilica BTESE layer was deposited on the surface of the
defective LTA zeolite membrane aiming at combining the high
hydrophilicity of LTA zeolite membrane with good acid resistance and
selectivity of BTESE. FT-IR, SEM, XRD and EDX showed that BTESE layer
was coated on the surfaces of LTA membrane. The effects of coating
circle and concentration of BTESE sol on the separation performance were
investigated in detail. The obtained BTESE/LTA composite membrane
maintained stable and high separation performance within 240 min for the
separation of 90 wt% ethanol/water mixture at pH=3, indicating the
BTESE/LTA membrane would be potential candidate for dehydration of
organics in acidic condition.