Hydrogen separation and purification using crosslinkable PDMS/zeolite A nanoparticles mixed matrix membranes (original) (raw)
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Preparation and characterization of Pd-zeolite composite membranes for hydrogen separation
Desalination, 2002
Zeolite A membranes have been synthesised by secondary growth on the surface of macroporous t~-alumina and stainless steel tubular supports, previously seeded with zeolite A crystals. The membranes thus obtained were used in the separation ofH2/N 2 and H2/C3H s mixtures. Stainless steel supports appeared to be more adequate for the development of zeolite A membranes by secondary growth, as evidenced by the results of XRD analysis and by higher values of selectivity and gas permeance obtained. The resulting membranes were further modified by CVD ofa Pd compound or impregnation with a Pd salt solution, in order to minimize the non-selective defects by Pd deposition. Permeation measurements carried out under pressure gradient did not show any apparent beneficial effect of Pd over H2/N 2 separation. However, in permeation tests carried out using a sweep gas, higher separation factors were achieved (e.g., ideal selectivity H2/C3H8 of 17.35 at 323 K, and H2/C3H s separation factor of 7.28 at the same temperature).
Hydrogen separation and purification using polysulfone acrylate-zeolite mixed matrix membranes
Journal of Membrane …, 2010
Mixed matrix membranes were prepared from derivatized polysulfone and zeolite particles. Aminopropyltrimethoxysilane was used as coupling agent to covalently link zeolite particles with the acrylate modified polymer. The mixed gas selectivity for H 2 /CO 2 separation increased from 1.53 for pure polysulfone to 3.57 at 40% zeolite loading. The results suggest that the covalent linkage of polymer and filler results in defect free membranes. The effect of different operating conditions (feed pressure, temperature and CO 2 feed concentration) was also studied.
Journal of Industrial and Engineering Chemistry
Polymeric membrane technology has received extensive attention in the field of gas separation, recently. However, the tradeoff between permeability and selectivity is one of the biggest problems faced by pure polymer membranes, which greatly limits their further application in the chemical and petrochemical industries. To enhance gas separation performances, recent works have focused on improving polymeric membranes selectivity and permeability by fabricating mixed matrix membranes (MMMs). Inorganic zeolite materials distributed in the organic polymer matrix enhance the separation performance of the membranes well beyond the intrinsic properties of the polymer matrix. This concept combines the advantages of both components: high selectivity of zeolite molecular sieve, and mechanical integrity as well as economical processability of the polymeric materials. In this paper gas permeation mechanism through polymeric and zeolitic membranes, material selection for MMMs and their interacti...
Chemical Engineering Science, 2012
This work concerns the preparation and characterization of ITQ-29 zeolite crystals with high Si/Ge ratio (100-N) and different particle size for obtaining mixed matrix membranes. The Si/Ge molar ratio and seeding content of the synthesis gel appeared to have an effect on the final crystal size, and particles of 2.5 mm were obtained for pure silica composition with good crystallinity. These were introduced, at 4, 8 and 12 wt% loadings, into a commercial polysulfone matrix to prepare mixed matrix membranes that showed promising results in the separation of H 2 /CH 4 mixtures (highest H 2 permeability 21.9 Barrer and a separation factor of 118 for the 4 wt% ITQ-29/polysulfone membrane). The thermal treatment of the membranes and the type of solvent were also optimized to provide good interaction between the zeolite and the polymer, limiting aggregation of the particles in the matrix, and removing all residual solvent that hinders gas permeation performance.
IRJET, 2022
Mixed matrix membranes (MMM) with moderate filler loading have been shown to improve the transport properties of polymers and their blends for many gas separations. Currently, the main focus of the research is to invent new membranes materials and their combinations for gas separation. PES/PSF (80/20%) blend with dispersed inorganic porous zeolite 4A MMM were fabricated at 10, 20, and 30% ZIF-4A loading For the pure gas permeation, the effect of zeolite 4A loading at 2 bar on permeability (Barrer) and selectivity were investigated. The addition of 10 % zeolite 4A into the polymer blend, increased the permeability about two times for gases O2 and N2, while the ideal selectivity shows a slight increase for pure PES/ PSF blend membrane. For the higher zeolite 4A loadings (≥ 30 %) permeability's were oxygen increasing but Nitrogen started to reduce rapidly due to agglomeration of nanoparticles, but it was found that still, the selectivity improved and increase with the addition of filler into the glassy polymer blend up to 25% and 30% loading
Heterogeneous membranes based on zeolites for separation of small molecules
Reactive and Functional Polymers, 2001
Heterogeneous zeolite-based membranes with polymeric binder were tested for the separation of hydrogen and methane. The separation process was characterized by parameters such as permeability, selectivity, and diffusion flux. The prepared membranes are superior to homogeneous polymeric membranes in permeability and diffusion flux. For H / CH separation 2 4 selectivity equal to 10 was attained.
Truly combining the advantages of polymeric and zeolite membranes for gas separations
Science
Mixed-matrix membranes (MMMs) have been investigated to render energy-intensive separations more efficiently by combining the selectivity and permeability performance, robustness, and nonaging properties of the filler with the easy processing, handling, and scaling up of the polymer. However, truly combining all in one single material has proven very challenging. In this work, we filled a commercial polyimide with ultrahigh loadings of a high–aspect ratio, CO 2 -philic Na-SSZ-39 zeolite with a three-dimensional channel system that precisely separates gas molecules. By carefully designing both zeolite and MMM synthesis, we created a gas-percolation highway across a flexible and aging-resistant (more than 1 year) membrane. The combination of a CO 2 -CH 4 mixed-gas selectivity of ~423 and a CO 2 permeability of ~8300 Barrer outperformed all existing polymer-based membranes and even most zeolite-only membranes.
Novel Zeolite-polyurethane membrane for environmental applications and gas separations
Matériaux & Techniques
This research work investigates the effect of polyurethane polymer on the separation of CO2, CH4 and C3H8 through a zeolite/polyurethane mixed matrix membrane. A methodology based on the modification of porous ceramic inorganic support with the aim to achieve high selectivity for the hydrocarbons has been developed. Polyurethane-zeolite nanoparticles were prepared by combined blending and casting method. The physical properties of the zeolite/polyurethane mixed matrix membrane were investigated by Scanning Electron Microscope (SEM), Fourier Transform Infra-Red spectroscopy (FTIR) and Nitrogen physisorption (BET). These confirmed the homogenous and nanoscale distribution of zeolite particles in the polyurethane-zeolite membrane. The Nitrogen physisorption measurements showed the hysteresis isotherm of the membrane corresponding to type IV and V that is indicative of a mesoporous membrane. The surface area and the pore size determined using the Barrett, Joyner, Halenda (BJH) desorption method showed a pore diameter of 3.320 nm, a pore volume of 0.31 ccg-1 and surface area of 43.583 m 2 g-1. Single gas permeation tests were carried out at a pressure range of 0.01 to 0.1 MPa. The membrane showed the permeance of CH4 to be in the range of 5.189 x 10-7 to 1.78 x 10-5 mol s-1 m-2 Pa-1 and a CH4/C3H8 selectivity of 3.5 at 293 K. On the basis of the results obtained it can be concluded that for the recovery of volatile organic compounds the addition of polyurethane polymer to the zeolite membrane did not increase the performance of the membrane.
Chemical Engineering & Technology, 2012
Interfacial void-free mixed-matrix membranes (MMMs) of polyimide (PI)/ zeolite were developed using 13X and Linde type A nano-zeolites and tested for gas separation purposes. Fabrication of a void-free polymer-zeolite interface was verified by the decreasing permeability developed by the MMMs for the examined gases, in comparison to the pure PI membrane. The molecular sieving effect introduced by zeolite 13X improved the CO 2 /N 2 and CO 2 /CH 4 selectivity of the MMMs. Separation tests indicated that the manufactured nanocomposite membrane with 30 % loading of 13X had the highest permselectivity for the gas pairs CO 2 /CH 4 and CO 2 /N 2 at the three examined feed pressures of 4, 8 and 12 atm.
In the recent years, zeolite T has been demonstrated as a potential materials for adsorption, catalysis, pervaporation as well as gaseous separation processes. However, the reported literature on the application of zeolite T as inorganic filler for the fabrication of mixed matrix membranes (MMMs) in CO 2 /CH 4 separation is not available. Therefore, in the present work, different loadings of zeolite T particles are embedded in 6FDA-durene polyimide. The morphology and structural properties of the resultant membranes were investigated using different analytical tools and the performance of the membranes in CO 2 and CH 4 gases separation were tested. The results showed that CO 2 permeability of 843.6 Barrer and CO 2 /CH 4 ideal selectivity of 19.1 were obtained using 1 wt% loaded zeolite T/6FDA-durene MMM, which were 80% and 172% higher than the CO 2 permeability and CO 2 /CH 4 ideal selectivity attained using pristine 6FDA-durene. Besides, the membrane showed improvement in CO 2 plasticization resistant up to 20 bar as compared to pristine 6FDA-durene membrane, which showed only 5 bar. Overall, zeolite T/6FDA-durene mixed matrix membranes fabricated in this work exhibited significant enhancement in CO 2 /CH 4 separation, which makes them an attractive candidate for industrial gas separation especially for natural gas purification.