Hydrogen Permeability of NiO-Doped Alumina with Nickel Composites Membrane

2012 ◽  
Vol 724 ◽  
pp. 213-216 ◽  
Author(s):  
Bo Young Shon ◽  
Mie Won Jung
Keyword(s):  
Hydrogen Permeation ◽  
Thermal Evolution ◽  
Sol Gel ◽  
Hydrogen Permeability ◽  
Organic Additive ◽  
Hot Press ◽  
Sol Gel Process ◽  
Increase Surface Area ◽  
Nickel Composites ◽  
Hot Press Sintering

NiO-doped Al2O3was synthesized with 20 wt% of nickel nitrate using the sol-gel process. P123 as an organic additive added to increase surface area of powder. The phase transformation, thermal evolution and surface morphology of the powder were characterized by XRD, TG-DTA and FE-SEM. The 20 wt% NiO-doped Al2O3/10 wt% Ni composite membrane was prepared by hot press sintering (HPS) following with a mechanical alloying process. Hydrogen permeation flux for 20 wt% NiO-doped Al2O3/10 wt% Ni membrane was obtained as 0.1 mol/m2s at 673K.

Preparation and Hydrogen Permeation on Al2O3-CuO-ZnO (ACZ)/Co Membrane by Hot Press Sintering (HPS)

2011 ◽  
Vol 695 ◽  
pp. 251-254 ◽  
Author(s):  
Saet Byol Rim ◽  
Kyeong Il Kim ◽  
Tae Whan Hong ◽  
Mie Won Jung
Keyword(s):  
Room Temperature ◽  
Hydrogen Permeation ◽  
Sol Gel ◽  
Hydrogen Permeability ◽  
Permeation Rate ◽  
Nitrate Hexahydrate ◽  
Distilled Water ◽  
Hot Press ◽  
Sol Gel Process ◽  
Hot Press Sintering

The Al2O3-CuO-ZnO (ACZ) was synthesized from sol-gel process with aluminum isopropoxide, copper (II) nitrate hemi pentahydrate, Zn (II) nitrate hexahydrate and primary distilled water. The ACZ synthesized powders were analyzed by TG/DTA, XRD, BET and FE-SEM. The ACZ-Co composites membrane was prepared by hot press sintering (HPS). Hydrogen permeability was characterized by Sievert's type hydrogen permeation membrane equipment. The hydrogen permeation rate was measured 0.0496 mol m-2 s-1 at room temperature under 2 bar of H2 atmosphere.

Fabrication and Characterization of CeO2-NiO/SiC Membranes for Hydrogen Permeation

2014 ◽  
Vol 353 ◽  
pp. 143-147 ◽  
Author(s):  
Ji Hye Park ◽  
Mie Won Jung
Keyword(s):  
Mixed Oxides ◽  
Hydrogen Permeation ◽  
Sol Gel ◽  
Hot Press ◽  
Reaction Enthalpy ◽  
Sol Gel Process ◽  
Fabrication And Characterization ◽  
Hot Press Sintering ◽  
Permeation Test

In order to enhance the hydrogen permeation, Silicon carbide (SiC) was prepared with CeO2-NiO mixed oxides via sol-gel process and the SiC membranes with various contents of χ wt% mixed oxides (χ = 20, 40, 60 and 80) were fabricated by hot-press sintering (HPS) at 1173 K under vacuum condition. The effect of the CeO2-NiO mixed oxides was studied in terms of properties on hydrogen permeation. All the membranes were characterized by XRD, FE-SEM and BET instrument. The hydrogen permeation test was carried out at various temperatures under 0.1 MPa. Hydrogen permeation flux of the 80 wt% CeO2-NiO/SiC membrane, which has the highest value, was obtained at 2.92×10-6mol/m2sPa, 323 K. The reaction enthalpy (ΔH°) was calculated as - 4.95 J/mol by Arrhenius’s plot.

Evaluations of Hydrogen Permeation on γ-Al2O3 Synthesized by Sol-Gel Process

2009 ◽  
Vol 620-622 ◽  
pp. 25-28
Author(s):  
Ji Hee Park ◽  
Mie Won Jung ◽  
Tae Whan Hong
Keyword(s):  
Room Temperature ◽  
Ceramic Membrane ◽  
Hydrogen Permeation ◽  
Thermal Evolution ◽  
Sol Gel ◽  
Alumina Ceramic ◽  
Distilled Water ◽  
Ceramic Support ◽  
Sol Gel Process ◽  
Metal Ceramic

The purpose of this work was hydrogen permeation of ceramic or metal/ceramic membrane using γ-Al2O3 by synthesizing. The γ-Al2O3 was synthesized by using the sol-gel process with aluminum isopropoxide and primary distilled water as the precursor and solvent. The γ-Al2O3-based membranes were prepared using HPS. The phase transformation, thermal evolution, surface are and morphology of γ-Al2O3 and γ-Al2O3-based membranes were characterized by XRD, TG-DTA, BET and FE-SEM. The hydrogen permeation of γ-Al2O3-based membranes was examined at room temperature comparing with other paper using nickel composited membrane on alumina ceramic support.

Evaluations of Hydrogen Permeation on TiN-20wt.%Co Membrane by Hot Press Sintering

2010 ◽  
Vol 297-301 ◽  
pp. 549-554
Author(s):  
Kyeong Il Kim ◽  
Sang Hern Kim ◽  
Whan Gi Kim ◽  
Soon Chul Ur ◽  
Tae Whan Hong
Keyword(s):  
Hydrogen Permeation ◽  
Operating Temperature ◽  
Hydrogen Permeability ◽  
Hydrogen Separation ◽  
Hot Press ◽  
New Materials ◽  
Practical Applications ◽  
Metal Ceramic ◽  
Polymer Metal ◽  
Hot Press Sintering

Nowadays, the most promising methods for high purity hydrogen production are membranes separation such as polymer, metal, ceramic and composites. It is well known that Pd and Pd-alloys membranes have excellent properties for hydrogen separation. However, it has hydrogen embrittlement and high cost for practical applications. Therefore, most scientists have studied new materials instead of Pd and Pd-alloys. On the other hand, TiN powders are great in resistance to acids and chemically stable under high operating temperature. In order to get specimens for hydrogen permeation, the TiN powders synthesized were consolidated together with pure Co powders by hot press sintering. During the consolidation of powders at HPS, heating rate was 10K/min and the pressure was 10MPa. It was characterized by XRD, SEM, and BET. Also, we estimated the hydrogen permeability by Sievert's type hydrogen permeation membrane equipment.

The Properties of YSZ-Ni-Cr Cermet Fabricated by Sol-Gel Method

2012 ◽  
Vol 535-537 ◽  
pp. 787-790
Author(s):  
Shu Lan Guo ◽  
Min Wang ◽  
Su Hua Lv ◽  
Jia Li ◽  
Xian Chang Du
Keyword(s):  
Particle Size ◽  
Sol Gel ◽  
Hot Press ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Increasing Temperature ◽  
Hot Press Sintering

The properties of YSZ-Ni-Cr cermet fabricated by Sol-Gel Method（YSZ-Ni-Cr powder was synthesized by coprecipitation method at 850°C for 2 h and was processed into YSZ-Ni-Cr cermet by hot-press sintering at 1350°C for 1 h）was explored. The identification of phases was carried out using a X-ray diffractometer (XRD). The particle size and morphology was determined by electron microscopys(SEM/TEM) The conductivity had a tendency to decrease with increasing temperature. This behavior can be accounted for that there are two conduction paths through the cermet, an electronic path through the (Ni,Cr) metal phase and an ionic path through the ZrO2-Y2O3 phase.

CHARACTERIZATION ON SILICA FROM WASTE SUGARCANE BAGASSE FOR MEMBRANE FABRICATION

2016 ◽  
Vol 78 (5-4) ◽  
Author(s):  
Hamizah Mokhtar ◽  
Ramlah M. T. ◽  
Aida Isma M. I. ◽  
Nabilah Huda A. H. ◽  
Noor Sa’adah A. H. ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Sol Gel ◽  
Organic Additive ◽  
Precipitation Method ◽  
Gravimetric Analysis ◽  
Oh Groups ◽  
Membrane Fabrication ◽  
Sol Gel Process ◽  
Characterization Test ◽  
Silica Oxide

The used of additive enhance the surface of the membrane layer and can be choose from various material. Examples of commonly used additive in membrane are Polyethylene glycol, silica oxide, cellulose acetate and Polyvinylpyrrolidone. Silica oxide was proven have ability to minimize the fouling problem hence increase hydrophobic properties of membrane. Silica also can be extracted from rice husk ash, sugarcane bagasse, sorghum vularae seed and kenaf by precipitation method, biodigestion and sol-gel process. Silica extraction from sugarcane bagasse was chosen as the organic additive for membrane formation. In order to investigate the suitability of the material, several characterization test have been conducted. There are thermal, microscopic and spectroscopic analyses. Thermal gravimetric analysis was performed on sugarcane bagasse to determine the amount of silica that can be extracted from it. Results of TGA on sugarcane bagasse show that the peak temperature at 315.70 °C are defined as crystalline melt. After the melt transition, the baseline takings to a slightly lower position than the pre-melt baseline. The post-melt baseline changes slope as the sample begins decomposition while TGA extrapolated onset temperature of 241.56 °C as this sample decomposes. The analysis of microscopic shows that the addition of silica from sugarcane bagasse changed the surface structure of the membrane especially at top layer and sub layer. Sugarcane bagasse show bands for carboxylate (COO-) and hydroxyl (OH-) groups. The availability of negatively charged groups at the surface of sugarcane bagasse shows potential to be used as additive in membrane fabrication.

Phase structure and thermal evolution in coatings and powders obtained by the sol-gel process: Part I. ZrO2−11.3 mol% Y2O3

1997 ◽  
Vol 12 (2) ◽  
pp. 493-500 ◽  
Author(s):  
P. C. Rivas ◽  
M. C. Caracoche ◽  
J. A. Martínez ◽  
A. M. Rodríguez ◽  
R. Caruso ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Thermal Evolution ◽  
Sol Gel ◽  
Correlation Spectroscopy ◽  
Cubic Phase ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Heating And Cooling ◽  
Sol Gel Process ◽  
Fast Movement ◽  
Zirconia Powders

Yttria-stabilized cubic zirconia powders and coatings produced by the sol-gel method have been investigated by Perturbed Angular Correlation Spectroscopy (PAC). Results indicate that the metastable cubic phase is retained during heating and cooling cycles. The hyperfine interaction that describes this cubic phase, once crystallized, exhibits two components in a constant ratio of 4 : 1. The components represent different vacancy configurations. For the fast movement of oxygen vacancies starting at 750 °C, which is reflected by the damping of the hyperfine pattern, an activation energy of 0.96 eV was determined.

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