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Published byIrene Farthing Modified about 1 year ago

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Research Subject 2 Development of New Inorganic Membranes Membranes – Ceramic membranes for H 2 separation – Ceramic membranes for CO 2 separation – Studies address mechanism of permeation Prediction of permeation properties

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Membrane preparation Experimental and modeling studies of membrane reactors Steam reforming CH 4 + H 2 O 2CO + 2H 2 Ethanol reforming C 2 H 5 OH + 3H 2 O 6H 2 + 2CO 2 Support Selective layer Research Subject 2 Studies of Membrane Reactors

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Applications and New Concepts Reforming of Natural Gas Water-gas shift (HTS o C, LTS – 200 o C) CO + H 2 O CO 2 + H 2 Product purification with pressure swing adsorption or cryogenic distillation Steam reforming of methane ( o C) CH 4 + H 2 O CO + 3 H 2 Feed cleanup Steam reforming Shift HTS LTS H2OH2O CH 4 Product H 2 purification CO 2 removal Condensate P. Hacarlioglu, Y. Gu, S. T. Oyama J. Nat. Gas Chem. 2006, 15,

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Membrane Reactor Studies: Separator Combines reaction and separation CH 4 + H 2 O CO + 3 H 2 Catalyst bed Quartz chips Membrane Quartz wool Dense tube Quartz liner Purge gas

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Tube side: Shell side: For a one-dimensional model Tube side: Shell side: For a two-dimensional model Reactor Modeling where F = molar flow C = concentration

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Pressure Dependence of MSR Pressure (atm) Flow rate of CH 4 (cm 3 (NTP) min -1 ) D model 2-D model CH 4 + H 2 OCO + 3H 2

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Radial and Axial Profiles of Hydrogen Flow T = 873 K P = 1 atm T = 873 K P = 10 atm T = 873 K P = 20 atm Bed side Empty tube side Membrane

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When Should a 2-D Model be Used? Criterion: Order Estimation Parameter R = volumetric rate ρ = density u = flow velocity C o = concentration P = permeance P = pressure r = radius Pe = Peclet number For our conditions gradients begin when P > 10 atm T = 873 K P = 10 atm Gradients expected when: Reaction rate > flow rate > Pe dPLdPL uC o ρRρR 2 Permeance rate > diffusion rate PΔP DΔC/r > Order estimation parameter uC o ρRρR 2 Pe dPLdPL PΔPPΔP DΔC/r > 0.01

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Operability Level Coefficient (OLC) = 1/DaPe Model I Model II Model I Model II Correlation independent of kinetics OLC dependent on reaction rates and permeances

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Hollow Fiber Membranes High surface area/volume ratio Easily processed Broad use

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