Experimental and Simulation Studies of Effects of Operating Conditions and Membrane Properties on the Performance of Zeolite Membrane Reactors for High Temperature Water Gas Shift Reaction
Seok-Jhin Kim, Shaowei Yang, Junhang Dong
Department of Chemical & Materials Engineering, University of Cincinnati, Cincinnati, OH 45220, USA
Modified microporous MFI-type zeolite membranes have been studied as high temperature water gas shift (WGS) membrane reactors (MR) using a cerium-doped ferrite (Fe/Ce) catalyst. The effects of the reaction conditions and the membrane separation properties on the CO-conversion (cCO) in the MR were investigated experimentally and by simulations using a simple one-dimensional model which was validated by the experimental data. The experimental results have demonstrated that the zeolite MRs with moderate H2 separation performance are capable of overcoming the equilibrium CO-conversion (cCO,e) existing in traditional packed-bed reactors at operating temperatures of >500oC where CO reaction rate is rapid enough to effectively minimize the permeation of the unreacted CO. The model calculations have shown that near-completion CO-conversion (cCO>99.5%) may be achieved under realistic operating temperature, pressure, space velocity and catalyst load even for membranes with moderate H2 selectivity, e.g. (aH2/CO2<50) and H2permeance (<3×10-7mol/s·m2·Pa).
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