scholarly journals Hydrothermal Stability and Performance of Silica-Zirconia Membranes for Hydrogen Separation in Hydrothermal Conditions.

2001 ◽  
Vol 34 (4) ◽  
pp. 523-530 ◽  
Author(s):  
KAZUHIRO YOSHIDA ◽  
YOSHIO HIRANO ◽  
HIRONORI FUJII ◽  
TOSHINORI TSURU ◽  
MASASHI ASAEDA
Keyword(s):  
Hydrothermal Stability ◽  
Hydrogen Separation ◽  
Hydrothermal Conditions ◽  
And Performance

A novel strategy to enhance hydrothermal stability of Pd-doped organosilica membrane for hydrogen separation

2017 ◽  
Vol 253 ◽  
pp. 55-63 ◽  
Author(s):  
Jiaojiao Lei ◽  
Huating Song ◽  
Yibin Wei ◽  
Shuaifei Zhao ◽  
Hong Qi
Keyword(s):  
Hydrothermal Stability ◽  
Hydrogen Separation ◽  
Novel Strategy

Design of Silica Networks for Development of Highly Permeable Hydrogen Separation Membranes with Hydrothermal Stability

2009 ◽  
Vol 131 (2) ◽  
pp. 414-415 ◽  
Author(s):  
Masakoto Kanezashi ◽  
Kazuya Yada ◽  
Tomohisa Yoshioka ◽  
Toshinori Tsuru
Keyword(s):  
Hydrothermal Stability ◽  
Hydrogen Separation ◽  
Separation Membranes

Design and Performance Analysis of a 1 MW Solid Oxide Fuel Cell System for Combined Production of Heat, Hydrogen, and Power

2011 ◽  
Author(s):  
William L. Becker ◽  
Robert J. Braun ◽  
Michael Penev
Keyword(s):  
Fuel Cell ◽  
Hydrogen Production ◽  
Capital Investment ◽  
Energy Requirement ◽  
Unit Cost ◽  
Hydrogen Separation ◽  
Hydrogen Gas ◽  
Performance Estimation ◽  
Pure Hydrogen ◽  
And Performance

SOFC systems with co-generation exhibit high overall efficiency. Fuel cell-based co-generation studies have typically focused on electricity and heat; pure hydrogen gas can also be generated in these systems as an energy co-product resulting in the combined production of heat, hydrogen, and power (CHHP). Co-locating a distributed generation SOFC CHHP plant with fueling stations for fuel cell vehicles enables use of lower scale (200 kg/day) hydrogen production and leverages the capital investment among all co-products, thereby lowering the unit cost of hydrogen and offering a potentially promising transition pathway to a hydrogen economy. This work focuses on the design and performance estimation of a methane-fueled 1 MW SOFC CHHP system operating at steady-state. System design and modeling are carried out employing Aspen Plus™ software where performance characteristics of the SOFC and the balance-of-plant are estimated from industry and literature sources. Analysis of the SOFC CHHP system indicates that the SOFC electrochemical performance is independent of the heat recovery and hydrogen production processes because the latter two subsystems are downstream of the SOFC power module. The system is configured such that it can preferentially produce hydrogen or low-temperature thermal energy (80 °C) as needed. Two methods of hydrogen purification and recovery from the SOFC tail-gas were analyzed: pressure swing adsorption (PSA) and electrochemical hydrogen separation (EHS). The recovered hydrogen is compressed to 425 bar for storage. The SOFC electrical efficiency at rated power is estimated at 48.1% (LHV) and the overall CHHP efficiency is 84.4% (LHV) for the EHS design concept. The amount of hydrogen recovery (85–90%) with EHS is higher than PSA for typical SOFC effluent gas compositions. The hydrogen separation energy requirement of 2.7 kWh/kg H2 for EHS is found to be about three times lower than PSA in this system. Increasing the amount of hydrogen production can be independently controlled by flowing excess methane into the system, effectively decreasing SOFC fuel utilization yet still reforming the fuel to a hydrogen-rich syngas. A case study for hydrogen overproduction is given. Operating the system to produce excess hydrogen increases the efficiency for both hydrogen separation design concepts.

The Hydrothermal Stability of Alkali-Activated Fly Ash/Slag Pastes by the Incorporation of Cement Kiln Dust

2019 ◽  
Vol 296 ◽  
pp. 15-20 ◽  
Author(s):  
Dana Kubátová ◽  
Alexandra Rybová ◽  
Anežka Zezulová
Keyword(s):  
Fly Ash ◽  
Sodium Hydroxide Solution ◽  
Hydrothermal Process ◽  
Hydrothermal Stability ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Hydrothermal Conditions ◽  
Alkaline Activator ◽  
Thermal Dilatometry ◽  
Kiln Dust

This paper deals with hydrothermal stability of inorganic aluminosilicate polymers, which were prepared by mixing blast furnace slag, fly ash and cement kiln dust in ratio 4:2:1. Cement kiln dust was used as alkaline activator with 4M sodium hydroxide solution. Samples were cured under hydrothermal conditions up to 170 °C for 24h and changes in mechanical properties, phase composition and porosity were monitored. During the hydrothermal process, the formation of zeolite from cancrinite group was monitored. The effect of the change of composition on the thermal expansion/shrinkage was studied by thermal dilatometry. Autoclaved samples were subjected to significant irreversible shrinkage during heating to 900 °C.

Stability of Pd nanoparticles on carbon-coated supports under hydrothermal conditions

2018 ◽  
Vol 8 (4) ◽  
pp. 1151-1160 ◽  
Author(s):  
Jiajie Huo ◽  
Robert L. Johnson ◽  
Pu Duan ◽  
Hien N. Pham ◽  
Deyny Mendivelso-Perez ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Biomass Conversion ◽  
Pd Nanoparticles ◽  
Hydrothermal Stability ◽  
Hydrothermal Conditions ◽  
Carbon Coated

Hydrothermal stability is one of the major challenges facing heterogeneous catalysis in biomass conversion to chemicals or fuels.

scholarly journals Templated nanostructure silica membrane versus template free one: synthesis, characterization and performance for hydrogen separation

2019 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Asieh Jabbari Gargari ◽  
Farnaz Assa ◽  
Ali Akbar Babaluo ◽  
Kamran Ghasemzadeh
Keyword(s):  
Hydrogen Separation ◽  
Silica Membrane ◽  
Template Free ◽  
And Performance

Scalable Polymeric Few-Nanometer Organosilica Membranes with Hydrothermal Stability for Selective Hydrogen Separation

ACS Nano ◽  
2021 ◽  
Author(s):  
Lingxiang Zhu ◽  
Liang Huang ◽  
Surendar R. Venna ◽  
Adrienne K. Blevins ◽  
Yifu Ding ◽  
...  
Keyword(s):  
Hydrothermal Stability ◽  
Hydrogen Separation

scholarly journals Morphologically Tunable MnO2 Nanoparticles Fabrication, Modelling and Their Influences on Electrochemical Sensing Performance toward Dopamine

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 323 ◽  
Author(s):  
Quanguo He ◽  
Guangli Li ◽  
Xiaopeng Liu ◽  
Jun Liu ◽  
Peihong Deng ◽  
...  
Keyword(s):  
Spatial Models ◽  
Modified Electrodes ◽  
Electrochemical Sensing ◽  
Oxide Glass ◽  
Hydrothermal Conditions ◽  
Glass Carbon Electrode ◽  
Dopamine Detection ◽  
Nanoparticle Structure ◽  
And Performance ◽  
Sensing Performance

The morphology or shape of nanomaterials plays an important role in functional applications, especially in the electrochemical sensing performance of nanocomposites modified electrodes. Herein, the morphology-dependent electrochemical sensing properties of MnO2-reduced graphene oxide/glass carbon electrode (MnO2-RGO/GCE) toward dopamine detection were investigated. Firstly, various morphologies of nanoscale MnO2, including MnO2 nanowires (MnO2 NWs), MnO2 nanorods (MnO2 NRs), and MnO2 nanotubes (MnO2 NTs), were synthesized under different hydrothermal conditions. Then the corresponding MnO2-RGO/GCEs were fabricated via drop-casting and the subsequent electrochemical reduction method. The oxidation peak currents increase with the electrochemical activity area following the order of MnO2 NWs-RGO/GCE, MnO2 NTs-RGO/GCE, and MnO2 NRs-RGO/GCE. The spatial models for MnO2 NWs, MnO2 NTs, and MnO2 NRs are established and accordingly compared by their specific surface area, explaining well the evident difference in electrochemical responses. Therefore, the MnO2 NWs-RGO/GCE is selected for dopamine detection due to its better electrochemical sensing performance. The response peak current is found to be linear with dopamine concentration in the range of 8.0 × 10−8 mol/L–1.0 × 10−6 mol/L and 1.0 × 10−6 mol/L–8.0 × 10−5 mol/L with a lower detection limit of 1 × 10−9 mol/L (S/N = 3). Finally, MnO2 NWs-RGO/GCE is successfully used for the determination of dopamine injection samples, with a recovery of 99.6–103%. These findings are of great significance for understanding the relationship between unlimited nanoparticle structure manipulation and performance improvement.

Design and performance of asymmetric supported membranes for oxygen and hydrogen separation

2020 ◽  
Author(s):  
Vladislav A. Sadykov ◽  
Nikita F. Eremeev ◽  
Yulia E. Fedorova ◽  
Alexey V. Krasnov ◽  
Ludmilla N. Bobrova ◽  
...  
Keyword(s):  
Hydrogen Separation ◽  
Supported Membranes ◽  
And Performance
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