Preparation of organosilica membranes on hydrophobic intermediate layers and evaluation of gas permeation in the presence of water vapor

Ren, Xiuxiu; Kanezashi, Masakoto; Nagasawa, Hiroki; Tsuru, Toshinori

doi:10.1016/j.memsci.2015.08.050

Cited by 24 publications

(13 citation statements)

References 32 publications

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“…The high thermal and oxidation stability of BTESE-derived membranes was confirmed after air treatment at 550°C due to the rearrangement of Si-C 2 H 4 -Si, which might have formed a SiC structure. [44][45][46][47] The least amount of change in the permeance ratio was used to certify that the pore size of the separation (BTESE) layer remained stable even after exposure to SO 3 . The O 2 flow rates in the retentate and permeate were measured after CaO absorber and SO 2 /SO 3 compositions were analyzed via FT-IR.…”

Section: O 2 /So 3 Separation Via a Btesederived Membrane Prepared mentioning

confidence: 99%

“…Generally, the separation layer consists of the smallest pores in a porous membrane, has the highest permeation resistance, and dominates the separation properties. [44][45][46][47] The least amount of change in the permeance ratio was used to certify that the pore size of the separation (BTESE) layer remained stable even after exposure to SO 3 . Meanwhile, the decrease in gas permeance of the BTESE/SiO 2 -ZrO 2 (Si/Zr = 7/3)/α-Al 2 O 3 membrane can probably be ascribed to the formation of sulphate in the intermediate layer since the BTESE layer (Si-O-Si and SiC) and α-Al 2 O 3 remained stable in SO 3 .…”

Section: O 2 /So 3 Separation Via a Btesederived Membrane Prepared mentioning

confidence: 99%

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Evaluating the chemical stability of metal oxides in SO₃ and applications of SiO₂‐based membranes to O₂/SO₃ separation

Meng

Nagasawa

et al. 2019

J Am Ceram Soc

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The decomposition of sulfur trioxide to produce sulfur dioxide and oxygen using a catalytic membrane reactor is technology that promises to improve the economic viability of the thermochemical water‐splitting Iodine‐Sulfur (IS) process for large‐scale CO2‐free hydrogen production. The chemical stability of membrane materials under SO3, however, is a significant challenge for this strategy. In this study, microporous membranes with a layered structure that consisted of a membrane support prepared from α‐Al2O3, an intermediate layer prepared from silica‐zirconia, and a top layer prepared from bis (triethoxysilyl)ethane‐derived organosilica sols, were examined for stability under SO3 and for use in SO3/O2 separation. An α‐Al2O3 support that features SiO2–ZrO2 intermediate layers with large pore sizes and a high Si/Zr molar ratio showed excellent resistance to SO3, which was confirmed by N2 adsorption, Energy Dispersive X‐ray Spectroscopy (EDS), and Scanning Electron Microscopy (SEM). These membranes also demonstrated a negligible change in gas permeance before and after SO3 exposure. Subsequently, in binary‐component gas separation at 550°C, microporous organosilica‐derived membranes achieved an O2/SO3 selectivity of 10 (much higher than the Knudsen selectivity of 1.6) while maintaining a high O2 permeance of 2.5 × 10−8 mol m–2 s–1 Pa–1.

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Section: O 2 /So 3 Separation Via a Btesederived Membrane Prepared mentioning

confidence: 99%

Section: O 2 /So 3 Separation Via a Btesederived Membrane Prepared mentioning

confidence: 99%

Evaluating the chemical stability of metal oxides in SO₃ and applications of SiO₂‐based membranes to O₂/SO₃ separation

Meng

Nagasawa

et al. 2019

J Am Ceram Soc

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“…In the nanofiltration of hexane from polyolefin oligomers, the permeability of hexane reached to 2.0–7.58×10 −11 m 3 m − 2 s − 1 Pa − 1 . In addition, Me–SiO 2 with a nanometer pore size prepared by TEOS and MTMS (methyltrimethoxysilane) was used as hydrophobic intermediate layers instead of hydrophilic intermediate layer such as SiO 2 –ZrO 2 to prepare BTESE and BTESO membranes for gas separation in humid process, as shown in Figure 9 [103,104,105]. The CO 2 gas permeance was around 10 −7 mol m −2 s −1 Pa −1 for both BTESE(O)/Me–SiO 2 and BTESE(O)/SiO 2 –ZrO 2 membranes in dry case.…”

Section: Hybrid Organosilica Membranementioning

confidence: 99%

Organosilica-Based Membranes in Gas and Liquid-Phase Separation

Ren

Tsuru

2019

Membranes

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Organosilica membranes are a type of novel materials derived from organoalkoxysilane precursors. These membranes have tunable networks, functional properties and excellent hydrothermal stability that allow them to maintain high levels of separation performance for extend periods of time in either a gas-phase with steam or a liquid-phase under high temperature. These attributes make them outperform pure silica membranes. In this review, types of precursors, preparation method, and synthesis factors for the construction of organosilica membranes are covered. The effects that these factors exert on characteristics and performance of these membranes are also discussed. The incorporation of metals, alkoxysilanes, or other functional materials into organosilica membranes is an effective and simple way to improve their hydrothermal stability and achieve preferable chemical properties. These hybrid organosilica membranes have demonstrated effective performance in gas and liquid-phase separation.

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“…The higher surface roughness will correspond with the larger membrane surface area, thereby resulting in higher water permeance. 52 On the other hand, loading higher than 1.0 wt% NP-CDs negatively affected the roughness because of agglomeration of the nanoparticles.…”

Section: Characterization Of Tfn Membranesmentioning

confidence: 99%

Influence of nitrogen/phosphorus-doped carbon dots on polyamide thin film membranes for water vapor/N₂ mixture gas separation

et al. 2019

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Preparation of organosilica membranes on hydrophobic intermediate layers and evaluation of gas permeation in the presence of water vapor

Cited by 24 publications

References 32 publications

Evaluating the chemical stability of metal oxides in SO₃ and applications of SiO₂‐based membranes to O₂/SO₃ separation

Evaluating the chemical stability of metal oxides in SO₃ and applications of SiO₂‐based membranes to O₂/SO₃ separation

Organosilica-Based Membranes in Gas and Liquid-Phase Separation

Influence of nitrogen/phosphorus-doped carbon dots on polyamide thin film membranes for water vapor/N₂ mixture gas separation

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Preparation of organosilica membranes on hydrophobic intermediate layers and evaluation of gas permeation in the presence of water vapor

Cited by 24 publications

References 32 publications

Evaluating the chemical stability of metal oxides in SO3 and applications of SiO2‐based membranes to O2/SO3 separation

Evaluating the chemical stability of metal oxides in SO3 and applications of SiO2‐based membranes to O2/SO3 separation

Organosilica-Based Membranes in Gas and Liquid-Phase Separation

Influence of nitrogen/phosphorus-doped carbon dots on polyamide thin film membranes for water vapor/N2 mixture gas separation

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Product

Resources

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Evaluating the chemical stability of metal oxides in SO₃ and applications of SiO₂‐based membranes to O₂/SO₃ separation

Evaluating the chemical stability of metal oxides in SO₃ and applications of SiO₂‐based membranes to O₂/SO₃ separation

Influence of nitrogen/phosphorus-doped carbon dots on polyamide thin film membranes for water vapor/N₂ mixture gas separation