Fuel Clean-Up System: Poisoning of Palladium-Silver Membranes by Gaseous Impurities

Pure hydrogen production in a membrane reformer: Demonstration, macro-scale and atomic scale modeling

“…This is evident from comparing DG/2 of dissociative hydrogen adsorption and that of CO. This is in agreement with several experimental work that reported dramatic reduction of the hydrogen permeance flux when carbon monoxide was added to the feed stream [29,30] [and Ref. within].…”

Methanol Steam Reforming Over NiAl and Ni (M) Al Layered Double Hydroxides (M = Au, Rh, Ir) Derived Catalysts

“…Noble metal ions were evidenced to be incorporated into NiAl-LDH framework, showing the textural features of LDHs as checked by XRD, TGA and TEM technique. The catalyst without modification presented high selectivity to CO 2 and H 2 , therefore largely reducing the risk of deterioration in the efficiency and lifetime of metal permeable membranes due to the high amount of CO in the reformate [23,24]. This catalyst shows the potential to be used in the integrated-membrane reactor for the methanol steam reforming in the temperature range 300-400°C.…”

Effect of CO and CO2 on H2 permeation through finger-like Pd–Ag membranes

“…membrane, 10% of CO 2 in the feed stream and operated at higher temperature (647 K). Differently, for a thicker membrane (250 mm) Chabot et al [15] reported that a mixture containing 9% of CO 2 and 9.5% of H 2 balanced with He slightly affects H 2 permeation (although much less significantly than CO), particularly at temperatures below 423 K. In this work, it was found that H 2 permeance could be considerably reduced due to CO 2 presence; as shown in Fig. 6, the hydrogen flux can be reduced by as much as 40%, for a CO 2 content in the feed of 20% at 473 K. In this case, however, the effect of temperature is not as pronounced as noticed for CO (c.f.…”