A Novel Membrane Reactor for Direct Hydrogen Production from Coal Page: 3 of 20
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ABSTRACT
Gas Technology Institute is developing a novel concept of membrane gasifier for high
efficiency, clean and low cost production of hydrogen from coal. The concept
incorporates a hydrogen-selective membrane within a gasification reactor for direct
extraction of hydrogen from coal-derived synthesis gases. The objective of this project is
to determine the technical and economic feasibility of this concept by screening, testing
and identifying potential candidate membranes under high temperature, high pressure,
and harsh environments of the coal gasification conditions. The best performing
membranes will be selected for preliminary reactor design and cost estimates.
To evaluate the performances of the candidate membranes under the gasification
conditions, a high temperature/high pressure hydrogen permeation unit has been
constructed in this project. The unit is designed to operate at temperatures up to 1100 C
and pressures to 60 atm for evaluation of ceramic membranes such as mixed ionic
conducting membrane. Several perovskite membranes based on the formulations of BCN
(BaCeo.sNdo.203.,) and BCY (BaCeo.sYo.203.x) were prepared by GTI and successfully
tested in the new permeation unit.
During this reporting period, two different types of membranes, Eu-doped SrCeO3 (SCE)
and SrCeo.95Tmo.osO3 (SCTm) provided by the University of Florida and the University of
Cincinnati, respectively were tested in the high pressure permeation unit. The SCTm
membrane, with a thickness of 1.7 mm, showed the highest hydrogen permeability
among the perovskite membranes tested in this project so far. The hydrogen flux
measured for the SCTm membrane was close to 0.8 cc/min/cm2 at a hydrogen feed
pressure of about 4 bar at 950 C.
SEM and EDX analysis for the tested SCTm membrane showed a separate Ce-rich phase
deposited along the grain boundaries in the region towards the feed side of the
membrane. No such phase separation was observed towards the permeate side. Partial
reduction of the SCTm perovskite material by the high pressure hydrogen, especially in
the feed side of the membrane, was postulated to be the possible reason for the phase
separation. Further investigation of the stability issue of the perovskite membrane is
needed.
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Shain Doong, Estela Ong; Atroshenko, Mike; Lau, Francis & Robers, Mike. A Novel Membrane Reactor for Direct Hydrogen Production from Coal, report, December 31, 2004; United States. (https://digital.library.unt.edu/ark:/67531/metadc873971/m1/3/: accessed April 22, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.