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Haihui Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of pt layer on the hydrogen Permeation Property of la5 5w0 45nb0 15mo0 4o11 25 δ membrane
Journal of Membrane Science, 2018Co-Authors: Yan Chen, Yanying Wei, Libin Zhuang, Huiqie Xie, Haihui WangAbstract:Abstract Catalytic Pt layers are coated on the surface of the mixed proton-electron conductive membranes based on La5.5W0.45Nb0.15Mo0.4O11.25-δ (LWNM) aiming to promote the hydrogen surface exchange, and effect of the Pt layer on the hydrogen Permeation flux through the LWNM membrane has been investigated. A hydrogen Permeation flux of 0.483 mL/min∙cm2 is achieved at 1000 °C fed with a mixture of 50% H2 − 50% He under wet condition with catalytic Pt layers on both sides of the LWNM membrane, which is twice as much as that of the uncoated membrane, indicating that the Pt layers on the membrane surface exhibit obvious positive effect on the hydrogen Permeation. The increase of the hydrogen Permeation flux is resulted from the enhancement of hydrogen dissociation/combination on the membrane surface by the Pt layer, which promotes the hydrogen surface exchange process. Moreover, it is more effective when the Pt layer is coated on the sweep side, which demonstrates that the hydrogen surface reaction on the sweep side of the membrane plays a predominant role compared with that on the feed side.
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niobium and molybdenum co doped la5 5wo11 25 δ membrane with improved hydrogen permeability
Journal of Membrane Science, 2016Co-Authors: Yan Chen, Shunfan Cheng, Li Chen, Yanying Wei, Peter J Ashman, Haihui WangAbstract:Abstract A mixed protonic–electronic conductor made of La 5.5 W 0.45 Nb 0.15 Mo 0.4 O 11.25− δ (LWNM) has been developed by partial co-substitution of W with Nb and Mo in La 5.5 WO 11.25 − δ aiming to improve the hydrogen Permeation Property. A hydrogen Permeation flux of 0.195 mL/min⋅cm 2 was obtained at 1000 °C with a mixture of 50% H 2 –50% He as the feed gas under dry condition. More importantly, there was no obvious decline of the hydrogen flux during 80 h operation even with CO 2 in the feed gas.
Azeman Mustafa - One of the best experts on this subject based on the ideXlab platform.
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Fabrication and characterization of mullite ceramic hollow fiber membrane from natural occurring ball clay
Applied Clay Science, 2019Co-Authors: Mohd Haiqal Abd Aziz, Mohd Hafiz Dzarfan Othman, Nur Awanis Hashim, Mohd Ridhwan Adam, Azeman MustafaAbstract:Abstract This work aims to study the physico-chemical and Permeation properties of ceramic hollow fiber microfiltration (MF) membranes. Ball clay from Perak, Malaysia was used as an alternative starting material for membrane preparation. The membranes were prepared at various solid loadings (37.5 to 50 wt%) and sintering temperatures (1150 to 1300 °C) via phase inversion-based extrusion/sintering method. Prior to membrane fabrication, the as-received ball clay underwent pre-treatment and was characterized using thermal gravimetric analysis (TGA), laser diffraction particle size analyzer (Metasizer 3000), field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). Sintered hollow fiber membranes were characterized in terms of crystalline phase using thin-film XRD, surface morphology via scanning electron microscope (SEM), mechanical Property using 3-point (3p) method, wall thickness, porosity, pore size distribution and Permeation Property. XRD patterns show that the ball clay contains 85.9% kaolinite, 9.5% illite, 3.6% quartz and 1% maghemite. After sintering, the major phase of the hollow fiber membranes transformed into mullite (91 to 94%) with minor traces of quartz. The membranes' properties strongly depend on both solid loading and sintering temperature. Moreover, when the hollow fiber membrane with solid loading of 47.5 wt% was sintered at 1250 °C, its mechanical strength (55.8 ± 5.8 MPa) was comparable to that of purity-based ceramic hollow fiber membranes. The membrane has an average porosity and pore size of about 50.5 ± 2.1% and 0.61 μm, respectively, which are within microfiltration range, and has an average pure water flux of 1286 ± 181 L/m2.hr. Compared with its high purity metal oxide ceramic counterparts, this alternative ball clay-based hollow fiber membrane can be sintered at lower sintering temperature while exhibiting comparable mechanical strength and water flux.
Tatsumi Ishihara - One of the best experts on this subject based on the ideXlab platform.
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Oxygen Permeation Property in Nd Deficient Nd2NiO4 Mixed Oxide Doped with Cu and Ga
Electrochemical and Solid State Letters, 2010Co-Authors: Akihiro Kawahara, Tatsumi IshiharaAbstract:Oxygen Permeation Property in Nd deficient Nd 2 NiO 4 was studied. The oxygen Permeation rate increases with increasing Ga. Nd deficiency in Nd 2 NiO 4 is also useful for increasing the oxygen Permeation rate. The improved oxygen Permeation rate could be assigned to the increased amount of excess oxygen and stabilizing a tetragonal structure at a low temperature. The oxygen Permeation rate of Nd 1.9 (Ni 0.75 Cu 0.25 ) 0.95 Ga 0.05 O 4 achieved a value of 3.6 cm 3 /min cm 2 from air to He at 1273 K with 0.5 mm thickness and this value belongs to the highest class in the reported oxygen Permeation rate.
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defect chemistry and oxygen Permeation Property of pr2ni0 75cu0 25o4 oxide doped with ga
Solid State Ionics, 2008Co-Authors: Tatsumi Ishihara, Kunihiko Nakashima, Sachio Okada, Makiko Enoki, Hiroshige MatsumotoAbstract:Abstract Mixed conductivity and oxygen Permeation Property in Pr2Ni0.75Cu0.25Ga0.05O4 were investigated. After examining various Ga concentrations, it was found that cation excess composition of Pr2Ni0.75Cu0.25Ga0.05O4 achieved the highest oxygen permeability of 298 μmol·min− 1·cm− 2 (6.68cc·min− 1·cm− 2) at 1273 K from air to He with a 0.5 mm thickness. The oxygen permeability of Pr2Ni0.75Cu0.25Ga0.05O4 increased with increasing the activity of surface catalyst and the highest Permeation was achieved when La0.9Sr0.1Co0.8Fe0.2O3 was used for the surface catalyst. The oxygen nonstoichiometry was further studied by using thermogravimetry. It was confirmed that the excess amount of oxygen was introduced at high PO2 range, which might be the origin of the high oxygen Permeation rate in this oxide.
Xiaohuai Hou - One of the best experts on this subject based on the ideXlab platform.
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the gas Permeation Property in trimethylsilyl substituted ppo and triphenylsilyl substituted ppo
Journal of Membrane Science, 1994Co-Authors: Jian Zhang, Xiaohuai HouAbstract:Abstract In this work, poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) was modified by trimethylchlorosilane and triphenylchlorosilane, and the gas Permeation properties in silyl-substituted PPO were studied by changing the substitution group, substitution position, and substitution value. The substituent group on phenylene of the polymer main chain affects the gas permeability in modified PPO more significantly than that on the methylside group. Gas permeability and some permselectivity in trimethylsilyl-substituted PPO increase, but the permeability and permselectivity in triphenylsilyl-substituted PPO both decrease as the substitution value increases. Because of similar values of gas solubility but various diffusivities among PPO and modified PPO, the difference in gas permeabilities in the polymers is caused mainly by the change in their gas diffusivities. The correlation between gas permeability and polymer molecular structure is summarised, and it is inferred that the gas permeability in the polymer may increase but permselectivity is not reduced if a moderate content of a bulky free group is introduced into a suitable position of the molecular backbone
Yan Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of pt layer on the hydrogen Permeation Property of la5 5w0 45nb0 15mo0 4o11 25 δ membrane
Journal of Membrane Science, 2018Co-Authors: Yan Chen, Yanying Wei, Libin Zhuang, Huiqie Xie, Haihui WangAbstract:Abstract Catalytic Pt layers are coated on the surface of the mixed proton-electron conductive membranes based on La5.5W0.45Nb0.15Mo0.4O11.25-δ (LWNM) aiming to promote the hydrogen surface exchange, and effect of the Pt layer on the hydrogen Permeation flux through the LWNM membrane has been investigated. A hydrogen Permeation flux of 0.483 mL/min∙cm2 is achieved at 1000 °C fed with a mixture of 50% H2 − 50% He under wet condition with catalytic Pt layers on both sides of the LWNM membrane, which is twice as much as that of the uncoated membrane, indicating that the Pt layers on the membrane surface exhibit obvious positive effect on the hydrogen Permeation. The increase of the hydrogen Permeation flux is resulted from the enhancement of hydrogen dissociation/combination on the membrane surface by the Pt layer, which promotes the hydrogen surface exchange process. Moreover, it is more effective when the Pt layer is coated on the sweep side, which demonstrates that the hydrogen surface reaction on the sweep side of the membrane plays a predominant role compared with that on the feed side.
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niobium and molybdenum co doped la5 5wo11 25 δ membrane with improved hydrogen permeability
Journal of Membrane Science, 2016Co-Authors: Yan Chen, Shunfan Cheng, Li Chen, Yanying Wei, Peter J Ashman, Haihui WangAbstract:Abstract A mixed protonic–electronic conductor made of La 5.5 W 0.45 Nb 0.15 Mo 0.4 O 11.25− δ (LWNM) has been developed by partial co-substitution of W with Nb and Mo in La 5.5 WO 11.25 − δ aiming to improve the hydrogen Permeation Property. A hydrogen Permeation flux of 0.195 mL/min⋅cm 2 was obtained at 1000 °C with a mixture of 50% H 2 –50% He as the feed gas under dry condition. More importantly, there was no obvious decline of the hydrogen flux during 80 h operation even with CO 2 in the feed gas.