Long term performance cobalt oxide silica membrane module for high temperature H2 separation

Yacou, Christelle; Smart, Simon; Costa, João C. Diniz da

doi:10.1039/c2ee03247c

Cited by 94 publications

(89 citation statements)

References 54 publications

(80 reference statements)

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“…The lowest gas purity in these isotherms were for the lowest retentate gas mixture which increased sequentially until the last point for a pure single gas (either 100% He or H 2 ). First, a similarity between both oxidising and reduction conditions is that the gas purity was independent of temperature, a finding consistent with recent reports [9,34] for cobalt oxide silica membranes. Therefore, these results further support the production of high quality membranes with a clear narrow pore size distribution based on molecular sieving dimensions.…”

Section: Fig 1 the Volumetric Adsorption Systemsupporting

confidence: 78%

“…Hence, Ar was used as a substitute molecule to maintain a binary gas mixture of H 2 /Ar instead of a quaternary and most likely highly transient gas mixture. In addition, Ar (d k =3.41Å) and [33] have similar kinetic diameters showing similar permeation performance through silica membrane [9]. Fig.…”

Section: Fig 1 the Volumetric Adsorption Systemmentioning

confidence: 91%

“…In principle, the silica amorphous structure tends to remain the same as H 2 reduces only the metal oxide. Further, the cobalt oxide particles have dimensions ~5 nm [9], which are too large compared with the average pore size of ~3Å of TEOS derived silica membranes. Hence, it is reasonable to say that the cobalt oxide particle is embedded into the silica matrix rather than being contained inside the pores.…”

Section: Fig 1 the Volumetric Adsorption Systemmentioning

confidence: 99%

“…As such, a cobalt oxide silica membrane was used in membrane reactors for processing H 2 from the water gas shift reaction [8]. Another example is gas separation reaching very high H 2 /Ar permselectivities closer to 1000 [9], thus illustrating that cobalt oxide silica membranes gas separation capabilities reached levels previously afforded only by CVD silica membranes [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Improved pore connectivity by the reduction of cobalt oxide silica membranes

Ji¹,

Smart²,

Bhatia³

et al. 2015

Separation and Purification Technology

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This work investigated the permeation of binary gas mixtures in non-reducing (He/CO 2 ) and reducing (H 2 /Ar) conditions at temperatures ranging from 200 to 500 ºC. A common performance aspect under both non-reducing and reducing conditions was that the He and H 2 purity in the permeate stream was independent of temperature for the tested binary gas mixtures, except at very high He/CO 2 or H 2 /Ar concentrations (≥90/10) in the retentate stream. Under non-reducing conditions, the transport of gases was consistent with molecular sieving properties of silica derived membranes, and He permeance was constant irrespective of the He/CO 2 binary concentration tested.An anomalous H 2 transport was observed under reduced conditions, as unexpectedly the H 2 permeance was higher for gas mixtures instead of single gas. Further tests showed that H 2 permeance increased 170% as the gas mixture changed from single H 2 gas to H 2 /Ar gas mixtures.This was attributed to the experimental procedure, as the membranes were partially reduced each day and tested for gas permeation from pure H 2 to lower H 2 concentration in gas mixtures. Under these partial reducing conditions, H 2 slowly reacts with the surface of the dense Co 3 O 4 particle, thus 2 forming a porous CoO region. The increase in H 2 permeance was therefore attributed to improved pore connectivity between the silica structure and the porous CoO region.

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Section: Fig 1 the Volumetric Adsorption Systemsupporting

confidence: 78%

Section: Fig 1 the Volumetric Adsorption Systemmentioning

confidence: 91%

Section: Fig 1 the Volumetric Adsorption Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved pore connectivity by the reduction of cobalt oxide silica membranes

Ji¹,

Smart²,

Bhatia³

et al. 2015

Separation and Purification Technology

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“…The membranes were tested at the University of Queensland in Australia using a steel pressurised vessel. Special graphite seals [33] were used to seal the membrane tubes, thus allowing high temperature permeation tests at a feed pressure of 300 kPa. Additional defect-free membranes were tested in a simulated syngas atmosphere.…”

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confidence: 99%

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

Deonarine

Smart

et al. 2017

Fuel Processing Technology

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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.

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Thin‐Film Ceramic Membranes

Yacou

Wang

Motuzas

et al. 2013

Encyclopedia of Membrane Science and Technology

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Ceramic membranes have undergone a concerted research development in the past two decades, since their initial development for uranium isotope processing for the nuclear industry in 1940s. The diversity of inorganic materials, such as ceramics, metals, and nonpolymeric carbons, has allowed researchers to build membranes by a number of processes ranging from simple sol‐gel dip coating to chemical vapor deposition and complex plasma coatings among many others. This article specifically covers all the major preparation methods currently employed in the preparation of thin‐film ceramic membranes derived from silica, zeolites, titania, hierarchical structures, and perovkites.

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Long term performance cobalt oxide silica membrane module for high temperature H2 separation

Cited by 94 publications

References 54 publications

Improved pore connectivity by the reduction of cobalt oxide silica membranes

Improved pore connectivity by the reduction of cobalt oxide silica membranes

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

Thin‐Film Ceramic Membranes

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