MFI/∗BEA hybrid coating on aluminum alloys

Synthesis of mono- and bi-layer MFI zeolite films on macroporous alumina tubular supports: Application to nanofiltration

“…The coated alumina tube with a monolayer of ZSM-5 zeolite film (MFI structure type) was placed for 1 hour in a cationic polymer solution (poly(diallyldimethylammonium) chloride 1 wt % aqueous solution, Aldrich) to reverse the negative charge of the MFI layer surface (by dip coating) [8,9,49] section. After the hydrothermal step, the substrates were rinsed abundantly with distilled water, placed in an ultrasonic bath for a few minutes to remove the loosely attached crystals and dried at 70 °C.…”

“…For example, high-silica zeolites (HSZ) are used for their sorption properties or good corrosion resistance while complementary sorption or antimicrobial properties of low-silica zeolite (LSZ) such as Y zeolite (FAU) [47] or modified zeolite A (LTA) [48] are exploited. Indeed, the combination of several zeolite layers in the same film raises more and more interest for the volatile organic compound (VOC) removal and the pollutants adsorption, including on-orbit decontamination [7][8][9]49]. Different aims are followed when synthesizing multi-layer zeolite membranes: 1) improved separation selectivity by repeated crystallizations of the same zeolite, 2) novel properties by combination of layers of different zeolite types [8,9,42,43,49].…”

“…Indeed, the combination of several zeolite layers in the same film raises more and more interest for the volatile organic compound (VOC) removal and the pollutants adsorption, including on-orbit decontamination [7][8][9]49]. Different aims are followed when synthesizing multi-layer zeolite membranes: 1) improved separation selectivity by repeated crystallizations of the same zeolite, 2) novel properties by combination of layers of different zeolite types [8,9,42,43,49]. Recently, Wang et al [50] and Dong et al [51] prepared a flat and a tubular asymmetric bilayer MFI membrane respectively, used as WGS membrane reactors.…”

Synthesis of Binderless ZK-4 Zeolite Microspheres at High Temperature

“…Synthetic aluminosilicate zeolites are among the most widely produced zeolites and used in many applications in research and industry [ 5 , 6 , 7 , 8 ]. However, commercialized powder zeolites often present a low molecular sieve performance limiting the mass transfer of reactant and product molecules and causing deactivation of adsorbents [ 9 , 10 , 11 , 12 , 13 , 14 ]. A secondary dust contamination due to particles breeding could also occur [ 12 , 13 , 14 ].…”

Synthesis of Binderless ZK-4 Zeolite Microspheres at High Temperature

“…Synthetic aluminosilicate zeolites are among the most widely produced zeolites and used in many applications in research and industry [5][6][7][8]. However, commercialized powder zeolites often present a low molecular sieve performance limiting the mass transfer of reactant and product molecules and causing deactivation of adsorbents [9][10][11][12][13][14]. A secondary dust contamination due to particles breeding could also occur [12][13][14].…”