Synthesis of pure silica STT-type zeolite membrane

Kida, Koji; Maeta, Yasushi; Yogo, Katsunori

doi:10.1016/j.matlet.2017.07.098

Cited by 17 publications

(14 citation statements)

References 8 publications

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“…The membrane prepared with H2O/SiO2 ratio of 54 had a showed H2/SF6 permeance ratio of 400 at 25 . The STT-type zeolite prepared in this study also showed high H2/SF6 permeance ratio at 40 5) . This result suggested that pinhole or crack formation was prevented by high water content in the synthesis gel.…”

Section: Synthesis Of Si-stt Zeolite Membranementioning

confidence: 63%

“…Zeolites generally contain silicon (Si), aluminum (Al), oxygen, and cations, such as protons, sodium ions, or calcium ions. The Si/Al ratio of the zeolite affects the physicochemical properties, and the hydrophobicity, thermal stability, and acid tolerance increase with higher Si/Al ratio 4), 5) . In addition, the number of cations in the zeolite framework decreases and the pore volume increases with lower Al content.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, zeolite membrane with high Si/Al ratio provides superior mass transfer compared to zeolite membrane with low Si/Al ratio. The characteristics of mass transfer affect the membrane permeance and selectivity 5) . Therefore, many studies have investigated the preparation and characterization of zeolite membranes with high Si/Al ratios 5) 7) .…”

Section: Introductionmentioning

confidence: 99%

“…However, preparation of STT-type zeolite membranes has rarely been reported. Pure silica STT-type zeolite (Si-STT) membrane was prepared by Kida et al 5) . However, the effects of the synthesis time, water, and structuredirecting agent (SDA) on the membrane preparation were not clear.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Gas Permeation Properties of STT-type Zeolite Membranes

Imasaka

Nakai

Araki

et al. 2018

J. Jpn. Petrol. Inst.

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Zeolite membranes can be used for separation and purification of natural gas. Natural gas contains mainly methane and carbon dioxide, but also contains acidic gases, such as hydrogen sulfide, and water. The application of conventional zeolite membranes containing aluminum to these separation processes is difficult because of poor acid durability and reduced flux in the presence of water. Pure silica zeolite membranes have high acid stability and are hydrophobic. In this study, STT-type zeolite was chosen as a membrane material for the relatively high pore volume and pure silica STT-type zeolite can be prepared. STT-type zeolite was milled in a ball mill for 8 h, and then coated on a porous alumina substrate. STT-type zeolite membranes were prepared by the secondary growth method. Times for synthesis of the STT-type zeolite particles and ball milling were optimized. The effects on permeance of synthesis time, and of the structure-directing agent/SiO2 and H2O/SiO2 ratios for secondary growth were investigated. STT-type zeolite membrane prepared from gel with a mole ratio of 1.0 SiO2 : 0.25 N,N,N-trimethyl-1-adamantane ammonium hydroxide : 54 H2O with hydrothermal synthesis for 8 days at 150 had high permeance ratio (169) for hydrogen to sulfur hexafluoride (SF6).

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Section: Synthesis Of Si-stt Zeolite Membranementioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and Gas Permeation Properties of STT-type Zeolite Membranes

Imasaka

Nakai

Araki

et al. 2018

J. Jpn. Petrol. Inst.

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“…With comparison with the standard XRD pattern, it can be found that another zeolite related to the STT type is formed when the TMAdaOH concentration is increased(x>0.5). The formation of the impure-phase zeolite is presumable because TMAdaOH is suitable for both directing the crystallization of CHA and STT zeolites at high temperature [24] . On the contrary, negligible crystals in CHA zeolite are produced with TEAOH as the single template[Fig.…”

Section: Synthesis Of Ssz-13 Membrane With Single Templatementioning

confidence: 99%

Synthesis Optimization of SSZ-13 Zeolite Membranes by Dual Templates for N2/NO2 Separation

Rong

Chen

et al. 2021

Chem. Res. Chin. Univ.

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igh-silica SSZ-13 zeolite membranes are promising in industrial separations of light gases and continuous membranes are highly demanded for better separation performances. Herein, pure-phase, continuous and thin SSZ-13 zeolite membranes were synthesized using dual templates of N,N,Ntrimethtyl-1-adamantammonium hydroxide(TMAdaOH) and tetraethylammonium hydroxide(TEAOH). Systematical investigations of TMAdaOH/TEAOH ratios and their concentrations show that TMAdaOH acts as the main structure-directing agent in the formation of the SSZ-13 zeolite. TMAdaOH cooperatively plays with TEAOH in promoting the SSZ-13 crystal intergrowth to form a continuous polycrystalline membrane. Additionally, appropriate introduction of TEAOH is able to adjust the membrane thickness to the crystal-comparable size of ca. 2.0 μm. The SSZ-13 membranes are further applied for N2/NO2 separation, which is firstly reported on zeolite membranes. The gas permeation results show that the SSZ-13 membrane synthesized by the dual-template approach exhibits selective separation of N 2 over NO 2 with N 2 /NO 2 separation factor of 7.6 and N 2 permeance of 1.66×10 -8 mol•m -2 •s -1 •Pa -1 .

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