KONG Qingqing, ZHANG Chun, WANG Xuerui, et al. Preparation of MFI zeolite membranes in fluoride media and separation performance for ethanol/water mixture[J]. CIESC Journal, 2014, (12): 5061-5066.
KONG Qingqing, ZHANG Chun, WANG Xuerui, et al. Preparation of MFI zeolite membranes in fluoride media and separation performance for ethanol/water mixture[J]. CIESC Journal, 2014, (12): 5061-5066.DOI: 10.3969/j.issn.0438-1157.2014.12.056.
MFI zeolite membranes were synthesized on seeded yttria stabilized zirconia (YSZ) hollow fiber substrates by using ammonium fluoride as mineralizing agent and tetrapropylammonium bromide as template. The as-synthesized membranes were tested for separation of ethanol/water mixture. The influences of nNH4F/nSiO2 ratio and synthesis time on separation performance were investigated. High-performance MFI zeolite membrane was synthesized at nNH4F/nSiO2=0.8 and synthesis time of 8 h
which showed a permeation flux of 8.2 kg·m-2·h-1 and ethanol/water separation factor of 47. The stability of MFI zeolite membranes in ethanol/water mixture was investigated. No Si—OH was detected on the surface of the as-synthesized MFI zeolite membranes
which could avoid decreased membrane separation performance by the reaction between Si—OH and ethanol.