A novel model equation for the permeation of hydrogen in mixture with carbon monoxide through Pd–Ag membranes

Barbieri, Giuseppe; Scura, Francesco; Lentini, F.; Luca, Giorgio De; Drioli, Enrico

doi:10.1016/j.seppur.2007.10.010

Cited by 76 publications

(69 citation statements)

References 19 publications

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“…1 and 2. These figures are obtained by simulating the behaviour of a real membrane taken from the literature [2,8] under the operating conditions reported in Table 1. The increasing continuous line is the permeance calculated in presence of polarization and inhibition at the same time (real case).…”

Section: Resultsmentioning

confidence: 99%

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On the role of the coupled effect of Inhibition by CO and Concentration Polarization on Hydrogen Permeation through Pd-based Membranes

Caravella

Scura

Barbieri

et al. 2011

Trans. Mat. Res. Soc. Japan

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In this work, H 2 permeation through Pd-based membranes is analyzed and discussed in presence of inhibition by CO and concentration polarization. Here, a complex hydrogen permeation model is used to evaluate the combined effect of these two phenomena by means of the following coefficients: Concentration Polarization Coefficient (CPC), Inhibition Coefficient (IC) and a novel overall Permeation Reduction Coefficient (PRC). The latter (PRC) takes into account the permeation rate decrease due to mass transfer resistance (polarization) and competitive CO adsorption (inhibition) on the active sites on membrane surface. According to their definition, when polarization and/or inhibition are relevant, CPC and/or IC tend to the unity, pushing also PRC to the same behaviour. On the contrary, when both are negligible, PRC approaches to zero. An important aspect arising from this study is that the polarization and inhibition effects on the overall permeance reduction are not simply additive, because it is found that CPC is lower in presence of inhibition. The present approach is general and provides a useful method to distinguish and quantify the negative effects of polarization and inhibition. Therefore, it can be applied also to other membrane-aided separation systems different from the here-considered one.

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Section: Resultsmentioning

confidence: 99%

“…In order to calculate quantitatively IC, the same complex model used for evaluating CPC is solved. The details of calculation of CPC and IC are not reported here, but can be found in the specialized literature [2,[6][7][8][9].…”

Section: Inhibition Coefficient (Ic)mentioning

confidence: 99%

On the role of the coupled effect of Inhibition by CO and Concentration Polarization on Hydrogen Permeation through Pd-based Membranes

Caravella

Scura

Barbieri

et al. 2011

Trans. Mat. Res. Soc. Japan

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“…(9) , Sieverts' equation is widely used for estimating the hydrogen permeation flux. Meanwhile, for a mixture containing the inhibiting gas (CO etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, for a mixture containing the inhibiting gas (CO etc.) (9) , the additional equations or terms have been coupled with the Sieverts' equation (9)- (11) . For instance, Israni and Harold introduced a model to consider the competitive adsorption of non-H 2 species on a 3.9μm thick tubular Pd/Ag membrane (23wt.% Ag), for methanol steam reforming application (10)- (11) .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Feed Flow Rate of Hydrogen Mixture on Hydrogen Permeation for Flat Sheet Pd/Ag Membrane with Stagnating Flow

Faizal

Kizu

Kawamura

et al. 2013

JTST

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The effect of feed flow rate of hydrogen mixture on the H 2 permeation for a flat sheet Pd/Ag membrane with stagnating flow at the upstream side was investigated experimentally and theoretically. A 77wt.% Pd/23wt.% Ag flat sheet membrane with 25μm thickness and 0.02m diameter was used. The permeation rate of H 2 was investigated under various feed flow rates (1.489 × 10 -5 -2.976 × 10 -4 mol/s), for pressures of 0.20-0.30MPa and reference membrane temperatures of 523-723K. Experimental results demonstrated that when the feed flow rate is decreased, the H 2 permeation rate decreases. This is supposed to be due to the phenomena of hydrogen concentration decrease at the membrane surface of the upstream side, as a result of the effect of H 2 permeation itself. When a theoretical equation that takes into account the effect of H 2 permeation is used, the H 2 permeation mole flux can be predicted quantitatively by using the concentration of H 2 of the feed mixture. This shows that the diffusive transport effect plays an important role as well as the convective transport effect when determining H 2 concentration at the membrane surface. In addition, the normalization of the theoretical results shows that the trend of the decrease in the H 2 permeation mole flux with respect to the feed mole flux follows the first order lag function, regardless of the inlet H 2 partial pressures.

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Fundamental of Chemical Membrane Reactors

Barbieri

Scura

2009

Membrane Operations

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A novel model equation for the permeation of hydrogen in mixture with carbon monoxide through Pd–Ag membranes

Cited by 76 publications

References 19 publications

On the role of the coupled effect of Inhibition by CO and Concentration Polarization on Hydrogen Permeation through Pd-based Membranes

On the role of the coupled effect of Inhibition by CO and Concentration Polarization on Hydrogen Permeation through Pd-based Membranes

Effect of Feed Flow Rate of Hydrogen Mixture on Hydrogen Permeation for Flat Sheet Pd/Ag Membrane with Stagnating Flow

Fundamental of Chemical Membrane Reactors

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