H2/CO2 Gas Separation Characteristic of Zeolite Membrane at High Temperature

2007 ◽  
Vol 26-28 ◽  
pp. 267-270
Author(s):  
Woo Teck Kwon ◽  
Soo Ryong Kim ◽  
Eun Bi Kim ◽  
Seong Youl Bae ◽  
Y. Kim
Keyword(s):  
Gas Separation ◽  
Coal Gasification ◽  
Hydrothermal Reaction ◽  
Low Cost ◽  
Porous Alumina ◽  
Hydrogen Permeability ◽  
Combined Cycle ◽  
Zeolite Membrane ◽  
Alumina Support ◽  
Zeolite Membranes

Due to the need for CO2 sequestration associated with H2 production from fossil fuels, zeolite membrane are very promising due to their low cost, high stability and high permeance. Recently, the faujasite(FAU), the silica/aluminophophate(SAPO-4) framework family of zeolite have been studied for CO2 gas separation. In our study, ZSM-5 membrane was prepared on the porous alumina support using a hydrothermal technique. The thickness of zeolite membrane was controlled by the hydrothermal reaction time and temperature. The prepared zeolite membranes were characterized with SEM and thin film XRD. The hydrogen permeability and selectivity toward carbon dioxide gas were 0.6x 10-6 mole/m2.s.pa and 3.16, respectively. The hydrogen selective zeolite membranes show promising application in hydrogen separation from coal gasification such as Integrated Gasification Combined Cycle (IGCC).

Hydrogen Separation Characteristics of SiC Nanoporous Membrane at High Temperature

2007 ◽  
Vol 26-28 ◽  
pp. 271-274 ◽  
Author(s):  
Y. Kim ◽  
Eun Bi Kim ◽  
Soo Ryong Kim ◽  
Moo Hyun Suh ◽  
Doo Jin Choi ◽  
...  
Keyword(s):  
High Temperature ◽  
Pore Size ◽  
Coal Gasification ◽  
Hydrogen Permeability ◽  
Hydrothermal Condition ◽  
Ceramic Membranes ◽  
Combined Cycle ◽  
Hydrogen Separation ◽  
Alumina Support ◽  
Good Thermal Stability

Ceramic membranes having less than 1nm size pores have great potential for gas separation at high temperature due to their good thermal stability. Moreover, nanoporous silicon carbide membrane has potential application under hydrothermal condition at high temperature since it is highly stable at high temperature. In this research, nanoporous SiC membrane has been developed on porous alumina support using preceramic polymer. Pore size of the SiC membrane was controlled using polystylene(PS) as the pore forming agent. The SiC membrane having controlled pore size was characterized with SEM, EDS, FT-IR, XRD and pore size measurement. The hydrogen permeability and selectivity toward nitrogen gas of the developed membrane were 0.3 x 10-6 mole/m2.s.pa and 4.1, respectively. The nanoporous hydrogen selective SiC membrane shows promising application in membrane reactor for steam reforming reacti on of natural gas, water gas shift reactions and hydrogen separation from coal gasification such as Integrated Gasification Combined Cycle (IGCC).

Synthesis of MCM-22 Zeolite Membrane on a Porous Alumina Support

2014 ◽  
Vol 805 ◽  
pp. 272-278 ◽  
Author(s):  
Antonielly dos S. Barbosa ◽  
Antusia dos S. Barbosa ◽  
Meiry Glaucia F. Rodrigues
Keyword(s):  
Porous Alumina ◽  
Mercury Porosimetry ◽  
Secondary Growth ◽  
Molecular Size ◽  
Zeolite Membrane ◽  
X Ray Diffraction ◽  
Alumina Support ◽  
X Ray ◽  
Ceramic Support ◽  
Separation Of Mixtures

Much interest has been aroused in the application in industrial processes using zeolite membrane, due to its crystalline structure, and narrow pore diameters. These features enable the continuous separation of mixtures based on differences in molecular size and shape and also based on different adsorption properties. This paper reports the synthesis of MCM-22 zeolite membrane, using the method of secondary growth. The MCM-22 zeolite was synthesized by the hydrothermal method and characterized by spectroscopy Energy Dispersive X-ray (EDX), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).The ceramic support (α-alumina) was prepared using the technique of forming powder and then subjected to the sintering temperature of 1400 °C/1h and characterized by XRD. The zeolite membrane preparation was performed by the method of secondary growth and characterized by XRD, SEM and mercury porosimetry. The obtained zeolite membrane could be confirmed by X-ray diffraction. From, the obtained SEM pictures it was possible to observe the formation of a homogeneous film on the zeolite surface of the ceramic support (α-alumina).

Recent development on the effect of water/moisture on the performance of zeolite membrane and MMMs containing zeolite for gas separation; review

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 42943-42961 ◽  
Author(s):  
K. C. Khulbe ◽  
T. Matsuura ◽  
C. Y. Feng ◽  
A. F. Ismail
Keyword(s):  
Water Vapour ◽  
Gas Separation ◽  
Gas Permeation ◽  
Zeolite Membrane ◽  
Gas Separations ◽  
Zeolite Membranes ◽  
Effect Of Water

Understanding the effects of water vapour on gas permeation and separation properties of zeolite membranes especially at lower temperatures is important for the applications of these zeolite membranes for gas separations involving water vapour.

scholarly journals Prevention in Thermal Crack Formation in Chabazite (CHA) Zeolite Membrane by Developing Thin Top Zeolite and Thick Intermediate Layers

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2113
Author(s):  
Min-Zy Kim ◽  
Syed Fakhar Alam ◽  
Devipriyanka Arepalli ◽  
Aafaq ur Rehman ◽  
Won-Youl Choi ◽  
...  
Keyword(s):  
Intermediate Layer ◽  
Secondary Growth ◽  
Particle Diameter ◽  
Zeolite Membrane ◽  
Average Particle ◽  
Alumina Support ◽  
Infiltration Process ◽  
Zeolite Membranes ◽  
Thermal Cracks ◽  
Intermediate Layers

Chabazite (CHA) zeolite membranes with an intermediate layer of various thicknesses were prepared using planetary-milled seeds with an average particle diameter of 300, 250, 200, 140, and 120 nm. The 120 nm seed sample also contained several smaller particles with a diameter of 20 nm. Such small seeds deeply penetrated into the pore channels of the α-alumina support during the vacuum-assisted infiltration process. During the secondary growth, the penetrated seeds formed a thick intermediate layer exiting between the zeolite layer and support. A decrease in seed size increased the penetration depth of seeds and the thickness of the intermediate layer, while the thickness of seed coating and zeolite layers was decreased. CHA zeolite membranes with a thin top zeoliate layer and a thick intermediate layer showed an excellent water/ethanol separation factor (>10,000) for 90 wt.% ethanol at 70 ℃ with a total flux of 1.5 kg m−2 h−1. There was no observation of thermal cracks/defects on the zeolite separation layer. The thick intermediate layer effectively suppressed the formation of thermal cracks during heating, since the tensile stress induced in the zeolite layer was well compensated by the compressive stress on the support. Therefore, it was successfully proven that controlling the microstructure of top surface and intermediate layers is an effective approach to improve the thermal stability of the CHA zeolite membrane.

scholarly journals CO2 Capture from IGCC by Low-Temperature Synthesis Gas Separation

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 515
Author(s):  
David Berstad ◽  
Geir Skaugen ◽  
Simon Roussanaly ◽  
Rahul Anantharaman ◽  
Petter Nekså ◽  
...  
Keyword(s):  
Low Temperature ◽  
Gas Separation ◽  
Co2 Capture ◽  
Synthesis Gas ◽  
Coal Gasification ◽  
Combined Cycle ◽  
Point Sources ◽  
Specific Power ◽  
Power Requirement ◽  
The Impact

Capture conditions for CO2 vary substantially between industrial point sources. Depending on CO2 fraction and pressure level, different capture technologies will be required for cost- and energy-efficient decarbonisation. For decarbonisation of shifted synthesis gas from coal gasification, several studies have identified low-temperature CO2 capture by condensation and phase separation as an energy- and cost-efficient option. In the present work, a process design is proposed for low-temperature CO2 capture from an Integrated Gasification Combined Cycle (IGCC) power plant. Steady-state simulations were carried out and the performance of the overall process, as well as major process components, were investigated. For the baseline capture unit layout, delivering high-pressure CO2 at 150 bar, the net specific power requirement was estimated to 273 kJe/kgCO2, and an 85% CO2 capture ratio was obtained. The impact of 12 different process parameters was studied in a sensitivity analysis, the results of which show that compressor and expander efficiencies, as well as synthesis gas separation temperature, have the highest impact on power requirements. Modifying the process to producing cold liquid CO2 for ship transport resulted in 16% increase in net power requirements and is well suited for capturing CO2 for ship transport.

The Development of Integrated Coal-Gasification Power Plants With Clean Combustion in Germany

1985 ◽  
Author(s):  
H. H. Finckh ◽  
R. Mueller
Keyword(s):  
Capital Investment ◽  
Power Plants ◽  
Coal Gasification ◽  
Modular Design ◽  
Low Cost ◽  
Electrical Energy ◽  
Gas Production ◽  
Combined Cycle ◽  
Fuel Gas ◽  
Electrical Energy Production

As advances are made in flue-gas clean-up systems, such as electrostatic precipitators, wet and dry desulfurization techniques and deNOX catalysers, the environmental impact of conventional steam turbine power plants fired with pulverized coal can be reduced at great expense in the form of additional capital investment and lowered station efficiency. The clean fuel gas obtainable from various coal-gasification processes, however, can be used to generate electricity with excellent efficiency and low-pollution emissions in low-cost unfired combined-cycle power plants of modular design. These are termed GUD power plants from the German designation “Gas und Dampf” meaning gas and steam. The overall efficiency is appreciably enhanced by closely integrating the gas-production process with the power generating cycle. Such an integrated coal-gasification combined-cycle installation should thus allow China to exploit its vast coal reserves for electrical energy production in both the most economical and environmentally acceptable way.

Improved AlPO-18 membranes for light gas separation

2015 ◽  
Vol 3 (23) ◽  
pp. 12205-12212 ◽  
Author(s):  
Bin Wang ◽  
Na Hu ◽  
Huamei Wang ◽  
Yihong Zheng ◽  
Rongfei Zhou
Keyword(s):  
Gas Separation ◽  
High Performance ◽  
Low Cost ◽  
Polymeric Membranes ◽  
Zeolite Membranes ◽  
Alumina Supports

AlPO-18 membranes synthesized using low-cost symmetric alumina supports showed high performance for light gas separation beyond polymeric membranes and most zeolite membranes.

scholarly journals Computational Molecular Modeling of Transport Processes in Nanoporous Membranes

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 124 ◽  
Author(s):  
Kevin Hinkle ◽  
Xiaoyu Wang ◽  
Xuehong Gu ◽  
Cynthia Jameson ◽  
Sohail Murad
Keyword(s):  
Molecular Modeling ◽  
Temporal Resolution ◽  
High Performance ◽  
Low Cost ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Nanoporous Materials ◽  
Transport Processes ◽  
Zeolite Membrane ◽  
Nanoporous Membranes

In this report we have discussed the important role of molecular modeling, especially the use of the molecular dynamics method, in investigating transport processes in nanoporous materials such as membranes. With the availability of high performance computers, molecular modeling can now be used to study rather complex systems at a fraction of the cost or time requirements of experimental studies. Molecular modeling techniques have the advantage of being able to access spatial and temporal resolution which are difficult to reach in experimental studies. For example, sub-Angstrom level spatial resolution is very accessible as is sub-femtosecond temporal resolution. Due to these advantages, simulation can play two important roles: Firstly because of the increased spatial and temporal resolution, it can help understand phenomena not well understood. As an example, we discuss the study of reverse osmosis processes. Before simulations were used it was thought the separation of water from salt was purely a coulombic phenomenon. However, by applying molecular simulation techniques, it was clearly demonstrated that the solvation of ions made the separation in effect a steric separation and it was the flux which was strongly affected by the coulombic interactions between water and the membrane surface. Additionally, because of their relatively low cost and quick turnaround (by using multiple processor systems now increasingly available) simulations can be a useful screening tool to identify membranes for a potential application. To this end, we have described our studies in determining the most suitable zeolite membrane for redox flow battery applications. As computing facilities become more widely available and new computational methods are developed, we believe molecular modeling will become a key tool in the study of transport processes in nanoporous materials.

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