Abstract (EN):
The permeance of a 50 mm thick PdAg (25 wt.% of silver) tubular membrane towards
hydrogen was evaluated for hydrogen feed streams or binary mixtures of industrial relevance,
namely of H2/CO or H2/CO2.
It was proposed a rearrangement of the SievertseLangmuir (SL) equation to account for
the inhibition effect on the membrane permeance towards H2 due to the presence of CO or
CO2. Such modification is based on the average partial pressure of CO or CO2 and the
logarithm-mean driving-force to account for concentration gradients along the axial length
of the tubular membrane. Comparison with the original SL equation evidenced relative
deviations < 10.7%. The experimental data showed good agreement with the SL model.
It was found that carbon monoxide has a much stronger inhibition effect on hydrogen
permeation than carbon dioxide. Considering the values obtained for the adsorption
enthalpy of each gas, it was concluded that both CO and CO2 adsorb physically on the
membrane surface.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Nº de páginas:
8