Dense inorganic membranes for production of hydrogen from methane and coal with carbon dioxide sequestration

Mundschau, M.; Xie, Xiaobing; Evenson, Carl R.; Sammells, Anthony F.

doi:10.1016/j.cattod.2006.01.042

Cited by 119 publications

(54 citation statements)

References 13 publications

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“…Mundschau et al [3] observed a similar surface morphology with numerous pinholes in pure Pd membrane after exposure to a 20 ppm H 2 S/H 2 mixture at 320 o C for over 120…”

Section: Surface Studies Of Poisoned Pd Surfacesmentioning

confidence: 80%

“…Mundschau et al [3] saw that FCC Pd/Cu alloys only had a 20% permeance decline when exposed to 20 ppm H 2 S. Kulprathipanja et al [5] found an almost linear correlation at 450ºC, regardless Figure 1. Pd-Cu phase diagram [8].…”

Section: Introductionmentioning

confidence: 99%

“…At 350ºC, a concentration of 4 ppm H 2 S/H 2 was sufficient to reduce the H 2 permeance of a Pd foil by 70% [2]. At 320ºC, a 20 ppm H 2 S/H 2 mixture was sufficient to convert a Pd foil to a Pd 4 S scale [3]. Pd 4 S scale formation was shown to drastically reduce the selectivity of a Pd membrane due to the change in lattice parameter [4,5], causing irreversible structural damage to the membrane.…”

Section: Introductionmentioning

confidence: 99%

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Sulfur Tolerant Pd/Cu and Pd/Au Alloy Membranes for H2 Separation with High Pressure CO2 for Sequestration

Hua¹,

Pomerantz²,

Chen³

2008

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The effect of H 2 S poisoning on Pd, Pd/Cu, and Pd/Au alloy composite membranes prepared by the electroless deposition method on porous Inconel supports was investigated to provide a fundamental understanding of the durability and preparation of sulfur tolerant membranes. X-ray photoelectron spectroscopy (XPS) studies showed that the exposure of pure Pd to 50 ppm H 2 S/H 2 mixtures caused bulk sulfide formation at lower temperatures and surface sulfide formation at higher temperatures. Lower temperatures, longer exposure times, and higher H 2 S concentrations resulted in a higher degree of sulfidation. In a Pd membrane, the bulk sulfide formation caused a drastic irrecoverable H 2 permeance decline and an irreparable loss in selectivity.Pd/Cu and Pd/Au alloy membranes exhibited permeance declines due to surface sulfide formation upon exposure to 50 ppm H 2 S/H 2 gas mixtures. However in contrast to the pure Pd membrane, the permeances of the Pd/Cu and Pd/Au alloy membranes were mostly recovered in pure H 2 and the selectivity of the Pd alloy layers remained essentially intact throughout the characterization in H 2 , He and H 2 S/H 2 mixtures which lasted several thousand hours. The amount of irreversible sulfur poisoning decreased with increasing temperature due to the exothermicity of H 2 S adsorption. Longer exposure times increased the amount of irreversible poisoning of the Pd/Cu membrane but not the Pd/Au membrane.Pd/Au coupon studies of the galvanic displacement method showed that higher Au 3+ concentrations, lower pH values, higher bath temperatures and stirring the bath at a rate of 200 rpm yielded faster displacement rates, more uniform depositions, and a higher Au content within the layers. While 400ºC was found to be sufficient to form a Pd/Au alloy

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“…Mundschau et al [3] observed a similar surface morphology with numerous pinholes in pure Pd membrane after exposure to a 20 ppm H 2 S/H 2 mixture at 320 o C for over 120…”

Section: Surface Studies Of Poisoned Pd Surfacesmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sulfur Tolerant Pd/Cu and Pd/Au Alloy Membranes for H2 Separation with High Pressure CO2 for Sequestration

Hua¹,

Pomerantz²,

Chen³

2008

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“…Additionally, this type of membranes provides the best selectivity-flux combination of all the membrane classes [20]. The drawback with Pd-alloy membranes is, however, that they are to various degrees prone to reduced H2 permeation rates (poisoning) by the presence of strongly adsorbing species such as CO and sulphur, that block the H2 dissociation sites [22]- [29], or even to complete deterioration of the membrane as in case of sulphur [30]- [32]. Sulphur removal after coal gasification is therefore critical for utilizing the full potential of Pd-alloy based membrane technology.…”

Section: H2 Separation Using Pd-alloy Membranesmentioning

confidence: 99%

High-purity H2 production with CO2 capture based on coal gasification

Jordal

Anantharaman

Peters

et al. 2015

Energy

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A novel hybrid concept is proposed, combining Pd-alloy membrane and low temperature separation technology, to produce pure H2 from gasified coal and capture the main part of the generated CO2. 75% of the H2 produced from gasification and water-gas shift is separated from the shifted syngas through H2-selective Pd-alloy membranes. After water removal, the H2-depleted, CO2-rich retentate stream is compressed and cooled, after which CO2 is condensed out at a purity level of ~99%. The "waste" volatiles from the low-temperature CO2 separation constitute a low heating value syngas that is burnt in a gas turbine. The gas turbine with a steam bottoming cycle generates a surplus of electricity that could be employed for H2 liquefaction. Altogether, the concept has the potential to be developed into a stand-alone high-purity H2 production unit with CO2 capture, suitable e.g. for remote areas from where H2 and possibly also CO2 must be transported by ship. However, the investigations of three different process alternatives, as well as three membrane separator parameters, illustrate that there are many degrees of freedom in the proposed concept that require further analysis, both individually and how they interact, in order to establish an optimized and purposeful stand-alone H2 production concept.

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“…Especially, it showed the maximum fragility and sensibility in sulfides even if these sulfides were extremely low in content [11]. Though the sulfides could be desorbed using zinc oxide powder or high-temperature sulphur adsorbent [12,13], great damage was caused to the Pd membrane used in highly-pure hydrogen preparation [14]. Based on the development trend of the Pd membrane with sulfuration resistance, high hydrogen permeation and low cost [15][16][17][18][19][20][21][22], the study of the influence mechanisms of sulfides on the Pd membrane surface was necessary.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen Sulfide and Redox Reactions on the Surface Properties and Hydrogen Permeability of Pd Membranes

et al. 2018

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Although hydrogen sulfide (H 2 S) was always a negative factor leading to the reduction of hydrogen permeability of palladium (Pd) membranes, its proper application could result in a positive effect. In this study, pure Pd membranes were firstly reacted with H 2 S at 23-450 • C, and then treated by redox reactions. Afterwards, the hydrogen permeability was tested under different reaction conditions using a hydrogen penetrant testing device. Moreover, both products and morphology changes occurred on the Pd membrane surface were analyzed using XRD, XPS and SEM. The results showed that H 2 S was dissociated to produce sulfides at 23 • C. With a rise of temperature, a regular change took place in the reaction products, morphology of the Pd membrane surface and hydrogen permeability. Adsorbed impurities such as sulfides and free carbon on the Pd membrane surface were removed by the redox treatment. The hydrogen permeability was improved by about 80% for the Pd membrane material subjected to the treatment method stated the above against the untreated one.

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Dense inorganic membranes for production of hydrogen from methane and coal with carbon dioxide sequestration

Cited by 119 publications

References 13 publications

Sulfur Tolerant Pd/Cu and Pd/Au Alloy Membranes for H2 Separation with High Pressure CO2 for Sequestration

Sulfur Tolerant Pd/Cu and Pd/Au Alloy Membranes for H2 Separation with High Pressure CO2 for Sequestration

High-purity H2 production with CO2 capture based on coal gasification

Influence of Hydrogen Sulfide and Redox Reactions on the Surface Properties and Hydrogen Permeability of Pd Membranes

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