Measurement and modeling of hydrogen transport through high-flux Pd membranes

The permeability of H2-selective palladium membranes fabricated with microsystem technology has been studied. The permeation experiments have been carried out at temperatures between 623 and 873 K at H2 feed partial pressures of 0.2–1.0 bar. At 823 K, a permeance based on the free membrane area of 18 mol H2/m2 s bar0.58 has been measured for a Pd membrane with a thickness of 0.5 μm. From the permeation experiments the rate determining transport step and the stability of the membranes have been determined. At 873 K the H2/He selectivity decreases rapidly, indicating the formation of pinholes at higher temperatures. From a combination of experiments and computer simulations the limiting transport step has been determined to be H-atom diffusion through the membrane at elevated temperatures and H2 surface reactions at the retentate side at lower temperature

Modeling of a fixed bed adsorptive drying of chlorine

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Maxwell-Stefan modelling of ion transport in a Nafion membrane

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Hydrodynamics of high gas-liquid ratio flows in a rotor-stator spinning disc reactor

The rotor-stator Spinning Disc Reactor (rs-SDR) is a versatile continuous flow reactor aiming at intensification of (micro)mixing and intensification of mass and heat transfer rates for both single and multiphase processes [e.g. 1,2]. For such transfer processes the hydrodynamics of the fluids govern the performance of the reactor. While for a single liquid flow the hydrodynamics in the rs-SDR are relatively well understood [3], for gas-liquid flows only low gas-liquid volumetric flow ratios (φv,G/φv,L≤1) have been described [2]. However, in many applications (such as boiling/condensing fluids, gas absorption) much higher gas-liquid flow ratios are encountered. To be able to perform (and more important, to control) such processes using a rs-SDR, the current work presents gas-liquid hydrodynamics (using high-speed image analysis), and the accompanying pressure drop, for high gas-liquid flow ratios (φv,G/φv,L = 120)

Maxwell-Stefan modelling of ion transport in a Nafion membrane

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