Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 100 for “"gas separation"”.
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Novel inorganic membranes for gas separation
… state-of-the-art membrane systems for CO₂/CH₄ separation which is critical in the natural gas industry. The systems that were reviewed included zeolite, carbon, polymeric, mixed matrix, amorphous silica, and supported ionic liquid membranes. Supported ionic liquid CO₂/CH₄ selective membranes …
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Polyacrylonitrile hollow fibre membranes for gas separation
… solution, and appeared to be more suitable for gas separation studies. The permeability of the PAN hollow fibre membranes to single gases was studied. The experimental results showed that the calculated pore radius on the surface of the fibre was in the range of 4- 32 nm. After coating with …
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Layered graphene nanomaterials for gas separation membrane applications
Membrane-based gas separation technologies have attracted great interest because of their potential to improve separation performance, lower energy and capital costs, reduce the equipment size, minimize the environmental footprint, and provide easier operation. The performance of gas separation …
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Gas Separation Using Nanoporous Single-Layer Graphene Membranes
… as a highly promising membrane material for gas separation due to its atomic thickness. When single-layer graphene contains a high density of gas sieving nanoscale pores, it can exhibit both a high gas permeance and a high selectivity, which is beneficial for reducing the cost of gas …
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Gas separation by membranes : technology and business assessment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1985.
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Engineering nanoporous materials for application in gas separation membranes
… and nanostructured surfaces for applications in gas separation membranes. Tunable methods have been developed to create inorganic hydroxide nanostructures on zeolite surfaces, and used to control the inorganic/polymer interfacial morphology in zeolite/polymer composite membranes. The study of the …
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Immobilized liquid membranes for facilitated transport and gas separation
Separation and purification of gas mixtures is a major area of activity in chemical engineering. Gas separation using facilitated transport membranes has been the subject of considerable research for many years. Immobilized liquid membranes (ILMs) are an important class of facilitated transport …
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Development of macroscopic nanoporous graphene membranes for gas separation
Separating components of a gas from a mixture is a critical step in several important industrial processes including natural gas purification, hydrogen production, carbon dioxide sequestration, and oxy-combustion. For such applications, gas separation membranes are attractive because they offer …
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ADVANCED MATERIALS AND PROCESSES FOR GAS SEPARATION AND STORAGE APPLICATIONS
… future requires departure from thermally driven separation processes. In that regard, development of new materials that exhibit high adsorption capacity and selectivity, fast kinetics, and long-term durability under multicomponent conditions is becoming attractive for the applications in clean …
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Molecular dynamics simulation of nanoporous graphene for selective gas separation
… pores has the potential to act as a filter for gas separation with considerable efficiency gains compared to traditional technologies. Nanoporous graphene membranes are expected to yield high selectivity through molecular size exclusion effects, while achieving high permeability due to the very …
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The preparation and characterization of hollow fibre membranes for gas separation
… of hollow fibre membranes suitable for gas separation applications, has been reproduced on a laboratory scale. Polysulphone hollow fibres were spun from a variety of solvents and their gas transport properties were characterized using equipment built during the course of the research. …
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Poly (2,6-dimethyl-1,4-phenylene oxide) hollow fibres for gas separation.
Hollow fibres used for gas separation applications need to have good mechanical strength and excellent gas separation properties. The production of hollow fibres by the dry-wet spinning process involves many variables, each having the potential to affect these properties. This is a systematic study …
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Reverse-selective gas-separation membranes prepared by atom transfer radical polymerization
… reforming of hydrocarbons followed by the water gas shift reaction. However, this process gives ∼25 mol% CO<sub>2</sub> as a byproduct, and the energy and capital–intensive pressure swing adsorption (PSA) procedures for CO<sub>2</sub> removal exhibit some unavoidable H<sub>2</sub> loss. …
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Synthesis and Characterization of Novel Polyimide Gas Separation Membrane Material Systems
… thermogravimetric analysis (TGA) and selective gas permeation methods, as well as other techniques. The O2 permeation and O2/N2 selectivity values obtained for materials prepared in this thesis are discussed in relation to the concept of an "upper bound", as defined in the literature concerning …
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Synthesis and Characterization of High Performance Polymers for Gas Separation Membranes
… polybenzoxazoles and polybenzimidazoles for gas separation applications. An abundance of monomers and novel polymers were synthesized and fabricated into membranes. Thermally rearranged polybenzoxazoles and their precursor polyimides were systematically studied with regard to size of pendant …
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Advanced Polymeric Membranes and Multi-Layered Films for Gas Separation and Capacitors
… focus on materials for polymeric capacitors and gas separation membranes. There is a need for polymeric capacitors with improved energy storage density and thermal stability. In this work, the affect of polymer molecular structure and symmetry on Tg, breakdown strength, and relative permittivity …
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