A novel intermittent hydrothermal method was applied to synthesize mordenite zeolite membrane.The membrane was synthesized in a template-free synthetic solution using commercially available,economical,macropo-rous α-Al2O3 tube as the substrate.The out surface of the substrate was coated with a mordenite seed layer via a hot-dip coating procedure.The influences of the traditional continuous heating method and the novel intermittent heat-ing method on the morphology,microstructure and pervaporation performance for isopropanol dehydration of the mordenite membranes were compared.The impacts of molar ratios of Na2O/SiO2,SiO2/Al2O3,and NaF/SiO2 in the synthetic solution on the preparation of mordenite zeolite membranes under intermittent hydrothermal synthesis were investigated.The as-synthesized mordenite zeolite membrane showed maximum pervaporation performance for isopropanol dehydration under optimized synthetic solution composition with the molar ratios of Na2O/SiO2,SiO2/Al2O3,and NaF/SiO2 were 0.24,16.7 and 0.25,respectively.The maximum water permeation flux was 5.60 kg·m-2· h-1 and the separation factor was greater than 10 000,respectively,in the dehydration of isopropanol/water mixture(9∶1,w/w)at 75 ℃.
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