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 23 for “"Membrane reactors"”.
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Dry reforming of associated natural gas using catalytic membrane reactors.
… into the atmosphere. In this thesis, a catalytic membrane reactor has been used to carry out experiments on the conversion of reactants, product selectivity and distribution, catalyst selection and activity. Interpretation of the reaction mechanism and kinetics of this important reaction are also …
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Engineering polymeric hollow fiber membrane reactors for sustainable chemical transformation reactions
… and metal nanoparticles on continuous-flow microreactors offers an efficient catalytic system that exploits and enhances the advantages of both nanocatalysis and flow chemistry, the so-called flow nanocatalysis approach. Various approaches have been developed for the development of …
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Oxygen Transport Membrane Reactors for Oxy-Fuel Combustion and Carbon Capture Purposes
<p>This thesis investigates oxygen transport membrane reactors (OTMs) for the application of oxy-fuel combustion. This is done by evaluating the material properties and oxygen permeability of different OTM compositions subjected to a variety of operating conditions. The scope of this work consists …
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Catalytic membrane reactors for synthesis gas production from natural gas via partial oxidation.
… oil. For the production of synthetic gas, membrane technology presents an attractive advantage improving conversion efficiency by operating as catalyst support, which then also increases the catalyst dispersion, resulting in optimal catalyst load and complete consumption of oxygen and …
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Computational Fluid Dynamics of High Temperature Shift Reaction of Reformate Gas in Fixed Bed and Membrane Reactors
… The conduction of the WGS reaction in a membrane reactor (MR) is a process intensive technology that not only increases hydrogen yield and purity but also reduces costs due to lesser energy required and lesser number of process units required compared to the traditional WGS approach. The …
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Analysis of a duo-selecting membrane reactor for the water-gas shift
… cells (phosphoric acid and polymer electrolyte membrane fuel cells) and must therefore be removed. The reaction is limited by thermodynamic equilibrium at higher temperatures, while kinetics are unfavorable at the lower temperatures. Current commercial technology uses at least two adiabatic beds …
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DEVELOPMENT OF NOVEL CATALYSTS AND PROCESSES FOR SUSTAINABLE HYDROGEN TECHNOLOGIES
… and efficiency. Additionally, integrating membrane reactors is proposed to enhance hydrogen recovery. Thermodynamic assessments were conducted across PDH, DRM, CDM, ammonia decomposition, and methylcyclohexane dehydrogenation to guide the development of commercially viable and sustainable …
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Influence of synthesis parameters on the properties of MXenes: a comparative study of ammonium bifluoride and HCl-LiF etching methods for membrane reactor applications
… hold immense potential for applications in membrane technology due to their unique structural and functional properties. This thesis explores the synthesis of MXenes from Ti3AlC2 MAX phase using various etching methods, including NH4HF2, HCl-LiF, and sonication-assisted techniques. The study …
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Catalytic membrane reactor-separator for environmental applications.
Flow-through catalytic membrane reactors offer the potential for improved conversions at reduced operating temperature due to product separation and catalyst activity. An experimental work dealing with a forced flow-through membrane reactor is the subject of this thesis. The focus is on the …
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Bijels For Continuous Reactive Separations
… systems have been studied: emulsion-based and membrane-based systems. However, the efficiency of these systems can be further enhanced. Significantly, all emulsion-based systems comprise a continuous phase and a droplet phase; the discrete nature of the droplets makes the supply or reagent or …
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Synthesis and characterization of thermally stable palladium-based composite membranes for high temperature applications
… in electroless-plated palladium-based composite membranes has been revisited. Palladium was doped with a higher melting point element such as ruthenium or platinum and the rate of increase of the nitrogen leak in the temperature range of 500-600 ºC was determined. The results showed that doping …
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Studies of the Ethanol Steam Reforming Reaction in a Membrane Reactor
… of this dissertation is advanced inorganic membranes and their application in membrane reactors (MRs). The reaction studied is the ethanol steam reforming (ESR) reaction using Co-Na/ZnO catalysts, chosen because of their high activity and stability. The Co-Na/ZnO catalysts were prepared by a …
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Catalytic Membrane Reactor for Extraction of Hydrogen from Bioethanol Reforming
… explores a novel application of catalytic membrane reactors for high- purity hydrogen extraction from bioethanol reforming. Conventional membrane systems employ hydrogen permselective materials such as palladium, polymer membranes, which present several material challenges including …
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Experimental study and modeling analysis of ion transport membranes for methane partial oxidation and oxyfuel combustion
… such as intermediate-temperature ceramic membranes, operating under reactive conditions, promise to ameliorate both. Challenges include the long term stability of the material, reactor design and integration into the overall system. The goal of this thesis is to develop a framework for the …
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Design and testing of an integrated catalytic membrane reactor for deoxygenating water using hydrogen for down-hole injection and process applications.
… this can be seen to be achievable by employing membrane technology. Membrane technologies provide compactness and are already applicable in other water treatments like reverse osmosis. In this study, inorganic tubular ceramic membranes with highly dispersed catalytic metals: palladium and …
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Combined Hydrogen and Oxygen transport membranes in the activation of Methane
Dense ceramic membranes have been extensively studied for gas separation and as reaction supports for significant environmental processes. In the work presented in this thesis, yttrium/zirconia doped barium cerate (BaCe0.8Y0.2O3-δ- BCY20 and BaCe0.6Zr0.2Y0.2O3-δ- BCZY) powders were synthesised …
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Composite inorganic membranes for hydrogen reaction, separation and purification.
Silica-alumina composite membranes for hydrogen separation and high temperature chemical reactions were prepared using both conventional and modified dip-coating techniques. These were deposited on commercially available a.-alumina macroporous support of 10 millimetre (mm) outer diameter, 7 mm …
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Hydrogen Production by Water Gas Shift Reaction Following Dry Reforming of Biogas Methane in Membrane and Packed Bed Tubular Reactors
… optimization of the catalyst, application in a membrane reactor and kinetic studies of the water gas shift reaction. A portfolio of ternary oxide catalysts with a nominal composition of 3Ni5Cu/CeZrM (where M = La, Mg, Y, Gd, Ca) were developed and prepared by surfactant assisted route. A binary …
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Crystalization studies in hollow fiber devices
… ratio, a task never performed before in membrane reactors. Porous hollow fiber emulsion crystallization (PHFEC) of a system with an immiscible solvent-antisolvent pair, salicylic acid in 1-octanol and water, encountered difficulties. While an emulsion of droplets smaller than 50 um was …
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