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Mahecha-Botero A.,University of British Columbia | Boyd T.,Membrane Reactor Technologies MRT Ltd. | Gulamhusein A.,Membrane Reactor Technologies MRT Ltd. | Grace J.R.,University of British Columbia | And 6 more authors.
International Journal of Hydrogen Energy | Year: 2011

A fluidized-bed membrane reformer was operated in two independent laboratories to map various operating conditions, to investigate the effects of changing the composition of the natural gas feed stream and to verify earlier experimental trials. Two feed natural gases were tested, containing either 95.5 or 90.1 mol% of methane (3.6 or 9.9 mol% of other gaseous higher hydrocarbons). Experimental tests investigated the influence of total membrane area, reactor pressure, permeate pressure and natural gas feed rates. A permeate-H 2-to reactor natural gas feed molar ratio >2.3 was achieved with six two-sided membrane panels under steam reforming conditions and a pressure differential across the membranes of 785 kPa. The total cumulative reforming time reached 395 h, while hydrogen purity exceeded 99.99% during all tests. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Andres M.-B.,University of British Columbia | Boyd T.,Membrane Reactor Technologies MRT Ltd. | Grace J.R.,University of British Columbia | Grace J.R.,Membrane Reactor Technologies MRT Ltd. | And 6 more authors.
International Journal of Hydrogen Energy | Year: 2011

A novel pilot fluidized-bed membrane reformer (FBMR) with permselective palladium membranes was operated with a limestone sorbent to remove CO 2 in-situ, thereby shifting the thermodynamic equilibrium to enhance pure hydrogen production. The reactor was fed with methane to fluidize a mixture of calcium oxide (CaO)/limestone (CaCO3) and a Ni-alumina catalyst. Experimental tests investigated the influence of limestone loading, total membrane area and natural gas feed rates. Hydrogen-permeate to feed methane molar ratios in excess of 1.9 were measured. This value could increase further if additional membrane area were installed or by purifying the reformer off-gas given its high hydrogen content, especially during the carbonation stages. A maximum of 0.19 mol of CO2 were adsorbed per mole of CaO during carbonation. For the conditions studied, the maximum carbon capture efficiency was 87%. The reformer operated for up to 30 min without releasing CO2 and for up to 240 min with some degree of CO2 capture. It was demonstrated that CO2 adsorption can significantly improve the productivity of the reforming process. In-situ CO2 capture enhanced the production of hydrogen whose purity exceeded 99.99%. © 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source

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