Influence of the Synthesis Parameters on the Morphology and Dehydration Performance of High-Silica Chabazite Membranes

Hasegawa, Yasumichi; Abe, Chie; Ikeda, Takuji; Sato, Koichi; Imasaka, Satoshi; Itakura, Masaya; Yano, Kazuhiro

doi:10.1166/apm.2016.1104

Cited by 6 publications

(9 citation statements)

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“…The XRD pattern of the membrane contained both the peaks of the support tube and seed particles, as shown in Figure 3 . These are identical to those reported previously [ 36 , 37 , 38 ]. This suggests that the polycrystalline CHA-type zeolite layer could be formed on the porous α-Al 2 O 3 tube with high reproducibility.…”

Section: Resultssupporting

confidence: 92%

“…The CO 2 /CH 4 selectivity was 171 at 295 K [28]. Some high-silica A high-silica CHA-type zeolite membrane was prepared on the outer surface of a porous α-Al 2 O 3 support tube by the combination of the secondary growth of seed particles and the structure conversion of FAU-type zeolite [36][37][38]. The seed particles were prepared by mixing sodium hydroxide (FUJIFILM Wako, Tokyo, Japan), sodium aluminate (FUJIFILM Wako, Tokyo, Japan), a N,N,N-trimethyl-1-adamantammonium hydroxide solution (SDA, 25%, Sachem Asia, Osaka, Japan), and ultra-stable Y-type zeolite particles (HSZ-390HUA, Tosoh, Tokyo, Japan).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we developed the rapid preparation technique for high-silica CHA-type zeolite membranes using the structure conversion of Y-type zeolite [ 36 , 37 , 38 ]. The influence of preparation conditions on the separation performances were studied, and the high reproducible procedures were determined [ 37 ]. The dehydration performances were determined for several organic solutions in our previous report [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

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Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

et al. 2021

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The polycrystalline CHA-type zeolite layer with Si/Al = 18 was formed on the porous α-Al2O3 tube in this study, and the gas permeation properties were determined using single-component H2, CO2, N2, CH4, n-C4H10, and SF6 at 303–473 K. The membrane showed permeation behavior, wherein the permeance reduced with the molecular size, attributed to the effect of molecular sieving. The separation performances were also determined using the equimolar mixtures of N2–SF6, CO2–N2, and CO2–CH4. As a result, the N2/SF6 and CO2/CH4 selectivities were as high as 710 and 240, respectively. However, the CO2/N2 selectivity was only 25. These results propose that the high-silica CHA-type zeolite membrane is suitable for the separation of CO2 from CH4 by the effect of molecular sieving.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

et al. 2021

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“…A CHA-type zeolite membrane was prepared by the secondary growth of seed particles [ 9 , 10 ]. The seed particles were synthesized using sodium aluminate (FUJIFILM Wako), sodium hydroxide (FUJIFILM Wako) , N , N , N -trimethyl-1-adamantammonium hydroxide solution (SDA, 25 wt%, Sachem), and ultrastable Y-type zeolite particles (Tosoh Corp., HSZ-390HUA).…”

Section: Methodsmentioning

confidence: 99%

“…We could form polycrystalline chabazite (CHA) type zeolite layers with various Si/Al ratios on porous α-Al 2 O 3 tubes previously [ 5 , 6 , 7 , 8 , 9 , 10 ]. In particular, the membrane with Si/Al = 18 showed the extremely high acid resistance [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Pervaporative Dehydration of Organic Solvents Using High-Silica CHA-Type Zeolite Membrane

2021

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A high-silica chabazite (CHA) type zeolite membrane was prepared on the porous α-Al2O3 support tube by the secondary growth of seed particles. The dehydration performances of the membrane were determined using methanol, ethanol, 2-propanol, acetone, acetic acid, methyl ethyl ketone (MEK), tetrahydrofuran (THF), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and N-methyl-2-pyrolidone (NMP) at 303–373 K. As a result, the dehydration performances of the membrane were categorized to following three types: (1) 2-propanol, acetone, THF, and MEK; (2) ethanol and acetic acid; and (3) methanol, DMF, and DMSO, and NMP. The adsorption isotherms of water, methanol, ethanol, and 2-propanol were determined to discuss the influences of the organic solvents on the permeation and separation performances of the membrane. For 2-propanol, acetone, MEK, and THF solutions, the high permeation fluxes and separation factors were obtained because of the preferential adsorption of water due to molecular sieving. In contrast, the permeation fluxes and separation factors were relatively low for methanol, DMF, and DMSO, and NMP solutions. The lower dehydration performance for the methanol solution was due to the adsorption of methanol. The permeation fluxes for ethanol and acetic acid solution were ca. 1 kg m−2 h−1. The significantly low flux was attributed to the similar molecular diameter to the micropore size of CHA-type zeolite.

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