Fig. 7 shows the hydrogen permeation through the Pd/Al2O3
composite hollow fibre membranes (Pd-1.0/HF-1300, Pd-3.3/
HF-1300, Pd-1.0/HF-1400 and Pd-3.3/HF-1400) at different
temperatures and transmembrane pressures.
As expected,hydrogen permeation flux increases with the elevated temperatures
and transmembrane pressures.
Moreover, the mass transfer resistance of the substrate will not represent major limitations since its gas permeability (as shown in Fig. 5) is more than 20 times higher than the composite membranes.
According to Irfan Hatim et al.
, resistance for hydrogen permeation through a Pd composite membrane combines three major parts, i.e. resistance from coated Pd membrane, substrate and an intermediate layer formed due to Pd penetration
(during the course of ELP).
The resistance of the coated Pd membrane and porous substrates has been well investigated.
However, the contribution of the penetrated Pd in hydrogen permeation is still unclear.
Penetrated Pd can fill and block all the packed-pore network of the intermediate layer, thus increasing the actual thickness of the Pd membrane, or reduce the porosity or pore size of the substrate, therefore increasing the gas permeation resistance of this layer.
Fig. 7 shows the hydrogen permeation through the Pd/Al2O3composite hollow fibre membranes (Pd-1.0/HF-1300, Pd-3.3/HF-1300, Pd-1.0/HF-1400 and Pd-3.3/HF-1400) at differenttemperatures and transmembrane pressures.As expected,hydrogen permeation flux increases with the elevated temperaturesand transmembrane pressures. Moreover, the mass transfer resistance of the substrate will not represent major limitations since its gas permeability (as shown in Fig. 5) is more than 20 times higher than the composite membranes.According to Irfan Hatim et al., resistance for hydrogen permeation through a Pd composite membrane combines three major parts, i.e. resistance from coated Pd membrane, substrate and an intermediate layer formed due to Pd penetration(during the course of ELP). The resistance of the coated Pd membrane and porous substrates has been well investigated.However, the contribution of the penetrated Pd in hydrogen permeation is still unclear. Penetrated Pd can fill and block all the packed-pore network of the intermediate layer, thus increasing the actual thickness of the Pd membrane, or reduce the porosity or pore size of the substrate, therefore increasing the gas permeation resistance of this layer.
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