关键词：复合材料;膜;制氢;退火;煤气化
摘 要：The synthesis of composite Pd membranes has been modified by the addition of a Al(OH)3 graded layer and sequential annealing at high temperatures to obtain membranes with high permeance and outstanding selectivity stability for over 4000 hours at 450DGC. Most of the membranes achieved in this work showed H2 flux well above 2010 DOE targets and in some case, also above 2015 DOE targets. Similar composite membranes were tested in water gas shift reaction atmospheres and showed to be stable with high CO conversion and high hydrogen recovery for over 1000 hours. The H2 permeance of composite Pd-Au membranes was studied as well as its resistance in H2S containing atmospheres. H2S poisoning of Pd-based membranes was reduced by the addition of Au and the loss undergone by membranes was found to be almost totally recoverable with 10-30 wtAu. PSA technique was studied to test the possibility of H2S and COS removal from feed stream with limited success since the removal of H2S also led to the removal of a large fraction of the CO2. The economics of a WGS bundle reactor, using the information of the membranes fabricated under this project and integrated into an IGCC plant were studied based on a 2D reactor modeling. The calculations showed that without a government incentive to impose a CO2 tax, application of WGS membrane reactors in IGCC would be not as economically attractive as regular pulverized coal plants.