Sulfur resistant Pd and Pd alloy membranes by phosphidation

Khatib, Sheima J.; Yun, Samhun; Oyama, S. Ted

doi:10.1016/j.memsci.2013.12.074

Cited by 21 publications

(17 citation statements)

References 28 publications

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“…Most oxygen membranes, both single and dual phase, contain alkaline metals because they provide higher oxygen permeabilities. Sheima and co-workers [139] reported some of the Sulphur compounds that these metals can form in their review for hydrogen membranes. They have collected the heat of formation of binary Sulphur compounds for most of the elements, which is reproduced in Figure 12.…”

Section: Sulphur Resistancementioning

confidence: 99%

“…YSZ is the most sensitive material under Sulphur compound containing atmospheres since yttrium present a high tendency to form the corresponding sulphate with a heat formation of −1260 kJ mol −1 . In addition, lanthanum-based perovskites are strongly affected by Sulphur since the corresponding heat formation for La 2 S 3 is also large, −1205 kJ mol −1 [139]. The influence of SO 2 on the oxygen permeation of LSCF hollow fiber membranes was studied [140] when the membrane was exposed to SO 2 .…”

Section: Sulphur Resistancementioning

confidence: 99%

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Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

et al. 2019

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Mixed ionic-electronic conducting membranes have seen significant progress over the last 25 years as efficient ways to obtain oxygen separation from air and for their integration in chemical production systems where pure oxygen in small amounts is needed. Perovskite materials are the most employed materials for membrane preparation. However, they have poor phase stability and are prone to poisoning when subjected to CO2 and SO2, which limits their industrial application. To solve this, the so-called dual-phase membranes are attracting greater attention. In this review, recent advances on self-supported and supported oxygen membranes and factors that affect the oxygen permeation and membrane stability are presented. Possible ways for further improvements that can be pursued to increase the oxygen permeation rate are also indicated. Lastly, an overview of the most relevant examples of membrane reactors in which oxygen membranes have been integrated are provided.

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Section: Sulphur Resistancementioning

confidence: 99%

Section: Sulphur Resistancementioning

confidence: 99%

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

et al. 2019

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“…Hence, there is growing interest in sulphur resistant H 2 separation membranes. 1 Various types of sulfur-resistant catalysts have been reported in the literature, such as W-based catalysts, 2,3 Mobased catalysts 4-7 lanthanide oxysulfide La 2 O 2 S, 8,9 noble metal catalysts (Rh,10,(11)(12)(13)), and phosphide catalysts. 14 Sulphided CoMo catalysts in promoted and unpromoted systems have been extensively studied in the WGS reaction because of their high activity and stability.…”

mentioning

confidence: 99%

Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Oemar

Bian

Hidajat

et al. 2016

Catal. Sci. Technol.

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A series of La x Ce 1−x Ni 0.5 Cu 0.5 O 3 catalysts was synthesized to study the effect of Ce substitution for La. XRD results show that only a small amount of Ce (10%) is allowable to substitute La to maintain the perovskite structure. The La 0.9 Ce 0.1 Ni 0.5 Cu 0.5 O 3 catalyst has the smallest metal particle size and the highest oxygen mobility among all tested catalysts as observed from the XRD, TPD-O 2 , and XPS results of reduced catalysts. These two factors are very important in achieving the highest catalytic activity of the La 0.9 Ce 0.1 Ni 0.5 Cu 0.5 O 3 catalyst in a water gas shift reaction at 450-650°C. In the presence of H 2 S, the catalytic activity at lower temperature was suppressed due to the formation of stable SO 4 2− species on the metal. However, since the amounts of surface oxygen species and adsorbed H 2 S are much lower at high temperature, the formation of SO 4 2− species is not observed, resulting in higher catalytic activity. The presence of H 2 S at high temperature enhances the formation of formate species, which can decompose to produce methane as the side product of the water gas shift reaction. IntroductionThe Water Gas Shift (WGS) reaction is one of the key reactions for hydrogen production in industry. The reaction is favorable at a low reaction temperature due to exothermicity. However, the reaction rate is lower at lower temperatures. Hence, the WGS reaction is industrially performed in two stages, i.e. high temperature WGS at 350-450°C to increase the reaction rate using an Fe-Cr catalyst, followed by low temperature WGS at 200-250°C to convert the remaining CO in the system using a Cu-Zn catalyst. With current growing interest in hydrogen production via biomass gasification technology which produces sulfur containing syngas, it is important to develop a new catalyst having high activity and stability not only at low (200-250°C) and high temperature (350-450°C) WGS reactions but also at ultra high temperatures (500-650°C) in the presence of a wide range of sulfur concentration. It is understood that biomass gasification is usually performed at high temperatures of 700-900°C. The syngas produced from the biomass gasification has a temperature of 700°C while the conventional WGS reaction requires lower reaction temperatures (200-450°C ). Hence, the syngas needs cooling for the reaction to take place, which means energy loss. The ultra high temperature WGS reaction can minimize the energy loss due to cooling of syngas. The consequences of having a sulphur resistant WGS catalyst is that the downstream hydrogen separation process should have sulphur resistant properties as well. Hence, there is growing interest in sulphur resistant H 2 separation membranes. 1 Various types of sulfur-resistant catalysts have been reported in the literature, such as W-based catalysts, 2,3 Mobased catalysts 4-7 lanthanide oxysulfide La 2 O 2 S, 8,9 noble metal catalysts (Rh,10,(11)(12)(13)), and phosphide catalysts. 14 Sulphided CoMo catalysts in promoted and unpromoted systems have been extensively...

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“…Whilst, the hydrogen flux reduction in comparison with the as-received PSS substrate ranged from 8% to 11% for the samples modified by 1 layer of tungsten, a higher hydrogen flux reduction between 20 to 28% was observed for the samples modified by 3 layers of tungsten. Although, an increase in the amount of tungsten enhanced the hydrogen flux reduction, the maximum flux reduction of 28% observed for the sample (5) suggests that tungsten does not have a dominant effect in altering the hydrogen flux through the surface porosity of the PSS substrate. This result also suggests that geometrical factors are the limiting feature that dominate the hydrogen permeability through the PSS substrate.…”

Section: Hydrogen Permeationmentioning

confidence: 82%

“…The change in volume leads to a lattice distortion, formation of high internal stresses, deformation, and ultimately failure of the membrane. The hydrogen embrittlement problem in combination with susceptibility of the pure Pd to surface poisoning by impurity gases [4,5] and the high cost of Pd have led to the exploration of a wide variety of Pd-alloy membranes [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Permeation through Porous Stainless Steel for Palladium based Composite Porous Membranes

Nayebossadri¹

2016

Res. Rev. J Mat. Sci

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Surface topography and hydrogen permeation properties of Porous Stainless Steel (PSS) substrates for thin-films deposition of Pd-based hydrogen separation membrane were investigated. Hydrogen permeance through the as-received PSS substrates demonstrated a wide range, despite a similar average surface pore size of 15 micron determined by SEM and confocal laser microscopy analyses. The surface pores of the PSS substrates were modified by impregnation of varying amounts of tungsten (W) powder. Maximum hydrogen flux reduction of only 28% suggested that W has a limited effect on the hydrogen permeation through the PSS substrate. Therefore, it is suggested that hydrogen transport through PSS substrates is mainly controlled by the substrate geometrical factors, particularly the ratio of the porosity to tortuosity (ε τ). The variation in the permeance between the nominally similar PSS substrates indicates the importance to independently assess the hydrogen transport characteristics of each of the components in a composite membrane.

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Sulfur resistant Pd and Pd alloy membranes by phosphidation

Cited by 21 publications

References 28 publications

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Hydrogen Permeation through Porous Stainless Steel for Palladium based Composite Porous Membranes

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Sulfur resistant Pd and Pd alloy membranes by phosphidation

Cited by 21 publications

References 28 publications

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Sulfur resistant LaxCe1−xNi0.5Cu0.5O3 catalysts for an ultra-high temperature water gas shift reaction

Hydrogen Permeation through Porous Stainless Steel for Palladium based Composite Porous Membranes

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Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction