Pore-size-controlled silica membranes with disiloxane alkoxides for gas separation

Lee, Hye Ryeon; Shibata, Toshinobu; Kanezashi, Masakoto; Mizumo, Tomonobu; Ohshita, Joji; Tsuru, Toshinori

doi:10.1016/j.memsci.2011.08.046

Cited by 38 publications

(23 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These organic pendant groups covalently linked to the silica backbone are hydrophobic in nature which is believed to confer some structural stability to the silica matrix. Recently, hybrid silica derived from organic-inorganic groups such as hexaethoxy disiloxane15, bis(triethoxysilyl)methane16, bis(triethoxysilyl)ethane171819, and 1,1,3,3-tetraethoxy-1,3-dimethyl disiloxane20 have also been used. The organic bridging groups that are linked between the silica atoms are commonly known as the organic spacers.…”

mentioning

confidence: 99%

Reversible Redox Effect on Gas Permeation of Cobalt Doped Ethoxy Polysiloxane (ES40) Membranes

Miller

Wang

Smart

et al. 2013

Sci Rep

View full text Add to dashboard Cite

This work reports the remarkable effect of reversible gas molecular sieving for high temperature gas separation from cobalt doped ethoxy polysiloxane (CoES40) membranes. This effect stemmed from alternating the reducing and oxidising (redox) state of the cobalt particles embedded in the ES40 matrix. The reduced membranes gave the best H2 permeances of 1 × 10−6 mol m−2 s−1 Pa−1 and H2/N2 permselectivities of 65. The reduction process tailored a molecular gap attributed to changes in the specific volume between the reduced cobalt (Co(OH)2 and CoO) particles in the ES40 structure, thus allowing for the increased diffusion of gases. Upon re-oxidation, the tailored molecular gap became constricted as the particles reversed to Co3O4 resulting a lower gas diffusion, particularly for the larger gases ie. CO2 and N2. The ES40 matrix proved to be structurally rigid enough to withstand the reversible redox effect of cobalt particles across multiple cycles.

show abstract

mentioning

confidence: 99%

Reversible Redox Effect on Gas Permeation of Cobalt Doped Ethoxy Polysiloxane (ES40) Membranes

Miller

Wang

Smart

et al. 2013

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Further, both He and H 2 gases have been reported to exhibit permeances of the same order of magnitude through micro-porous silica membranes [34,35]. With respect to tar compounds, benzene, toluene and naphthalene have been used as tar models for catalytic studies [36] and for elucidating the interactions between tars and solid oxide fuel cell anodes [37].…”

Section: Simulated Syngas Testingmentioning

confidence: 99%

Ultra-microporous membrane separation using toluene to simulate tar-containing gases

Deonarine

Smart

et al. 2017

Fuel Processing Technology

View full text Add to dashboard Cite

This study investigates the performance of ultra-microporous cobalt oxide silica membranes for processing simulated gas streams containing toluene as a model tar compound in gasification. The performance of the membranes was initially investigated for He (simulating H 2 ), CO 2 , N 2 and Ar in a range of temperatures. Subsequently, toluene was added to a gas mixture containing He and tested to 2 simulate the effect of toluene as a tar compound in gasification. The membranes delivered molecular sieving features, showing activated transport as the permeation of the smaller molecular gas He increased with temperature whilst the permeation decreased for the other larger molecular gases. Prior to toluene exposure, He permeance increased by almost twofold from 3.6 × 10 -8 to 7.1 × 10 -8 mol m -2 s -1 Pa -1 as the temperature was raised from 50 to 200 °C. Under a feed gas containing 0.24 mol% toluene, He permeance decreased by an average value of 17%. Upon regeneration of the membrane by heat, He permeance was not fully recovered, a clear indication of tar fouling. A toluene balance calculation showed toluene being retained by the membrane.

show abstract

“…Layer-I [15]: In the original configurational model as shown in Eq. (7), the molecular size is not explicitly incorporated based on the assumption that the size of the gas is small enough.…”

Section: Layer-iiimentioning

confidence: 99%

“…The normalized Knudsen-based permeance (NKP) method, which is based on the activated Knudsen model originally proposed by Xiao and Wei [9] and by Shelekhin et al [6], was proposed for the determination of membrane pore sizes of less than 1 nm [15,21]. NKP is the permeance ratio of the i th component ( , …”

Section: Calculation Of the Nickel-layer Pore Mean Diametermentioning

confidence: 99%

CFD modeling of the H 2 /N 2 separation with a nickel/α-alumina microporous membrane

Benguerba

Amer

Ernst

2015

Chemical Engineering Science

View full text Add to dashboard Cite

Pore-size-controlled silica membranes with disiloxane alkoxides for gas separation

Cited by 38 publications

References 34 publications

Reversible Redox Effect on Gas Permeation of Cobalt Doped Ethoxy Polysiloxane (ES40) Membranes

Reversible Redox Effect on Gas Permeation of Cobalt Doped Ethoxy Polysiloxane (ES40) Membranes

Ultra-microporous membrane separation using toluene to simulate tar-containing gases

CFD modeling of the H 2 /N 2 separation with a nickel/α-alumina microporous membrane

Contact Info

Product

Resources

About