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CO2 Selective Ceramic Membrane for Water-Gas-Shift Reaction With Concomitant Recovery of CO2, Quarterly Report: October - December 2004
Our CO{sub 2}-affinity material synthesis activities thus far have offered two base materials suitable for hydrogen production via low temperature water gas shift reaction (LTS-WGS) with concomitant removal of CO{sub 2} for sequestration. They include (i) a nanoporous CO{sub 2}-affinity membrane and (ii) a hydrotalcite based CO-affinity adsorbent. These two materials offer a commercially viable opportunity for implementing an innovative process concept termed the hybrid adsorbent-membrane reactor (HAMR) for LTS-WGS, proposed by us in a previous quarterly report. A complete mathematical model has been developed in this quarter to describe the HAMR system, which offers process flexibility to incorporate both catalysts and adsorbents in the reactor as well as permeate sides. In comparison with the preliminary mathematical model we reported previously, this improved model incorporates ''time'' as an independent variable to realistically simulate the unsteady state nature of the adsorptive portion of the process. In the next quarterly report, we will complete the simulation to demonstrate the potential benefit of the proposed process based upon the performance parameters experimentally obtained from the CO{sub 2}-affinity adsorbent and membrane developed from this project.
Date:
January 31, 2005
Creator:
Liu, Paul K. T.
System:
The UNT Digital Library
CO2 Selective Ceramic Membrane for Water-Gas-Shift Reaction With Concomitant Recovery of CO2, Quarterly Report: January-March 2005
In this quarter, we have focused on the completion of the loose ends of the experimental study. A series of CO{sub 2}-affinity membranes (carbonaceous base) prepared previously were characterized and evaluated for their suitability for the proposed application The CO{sub 2} permeance and selectivity are 0.5 to >3 m{sup 3}/m{sub 2}/hr/bar and 4 to 10 for CO{sub 2} over nitrogen respectively. Based upon its performance dependence on temperature and pore size, we conclude that this type of CO{sub 2} affinity membrane shows significant surface affinity to CO{sub 2} over nitrogen even at the temperature as high as 220 C, which is within the typical operating condition for LTS-WGS. Future study should focus on mixture separations for CO/CO{sub 2}/H{sub 2} to establish the selectivity of CO{sub 2} over CO and H{sub 2} which are present in the WGS reaction of the coal gasifier off-gas.
Date:
June 1, 2005
Creator:
Liu, Paul K.T.
System:
The UNT Digital Library