Flux-Reducing Tendency of Pd-Based Membranes Employed in Butane Dehydrogenation Processes

Peters, Thijs; Stange, M.; Bredesen, Rune

doi:10.3390/membranes10100291

Cited by 3 publications

(3 citation statements)

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“…Traditional hydrogen purification methods like pressure swing adsorption (PSA) have drawbacks such as high energy consumption, low hydrogen purity, and large foot-print area [8]. Hydrogen purification using Pd membranes 2 of 13 shows great potential in small-to medium-scale hydrogen production [9,10]. By integrating the NH 3 decomposition process with membrane purification in a single chamber [11,12], the separation and purification of hydrogen are realized while the decomposing reaction is conducted.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Flux Inhibition of Pd-Ru Membranes under Exposure to NH3

Chen,

Li,

Yin

et al. 2024

Membranes

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The hydrogen flux inhibition of Pd-Ru membranes under exposure to 1–10% NH3 at 673–773 K was investigated. The Pd-Ru membranes were characterized by XRD, SEM, XPS, and hydrogen permeation tests. The results show that when exposed to 1–10% NH3 at 723 K for 6 h, the hydrogen flux of Pd-Ru membranes sharply decreases by 15–33%, and the decline in hydrogen flux becomes more significant with increasing temperatures. After the removal of 1–10% NH3, 100% recovery of hydrogen flux is observed. XPS results show that nitrogenous species appear on the membrane surface after NH3 exposure, and the hydrogen flux inhibition may be related to the competitive adsorption of nitrogenous species. By comparing the hydrogen flux of Pd-Ru membranes exposed to 10% NH3 with 10% N2, it is indicated that the rapid decrease in hydrogen flux is due to the concentration polarization and competitive adsorption of nitrogenous species. The competitive adsorption effect is attenuated, while the concentration polarization effect becomes more pronounced with increasing temperature.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Flux Inhibition of Pd-Ru Membranes under Exposure to NH3

Chen,

Li,

Yin

et al. 2024

Membranes

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“…For instance, the Ag films prepared by the electroless-plating method exhibit dendritic morphology and highly nonuniform growth, and tend to grow in the vertical direction on Pd membrane surface, with poor lateral growth or pore coverage [4]. The magnetron sputtering method exhibits improved control in both composition and microstructure through multicomponent targets, where ultra-thin, uniform and dense Pd-Ag membranes can be obtained [14,20,21] (. However, the equipment of magnetron sputtering is relatively expensive and requires a strict fabrication procedure, while membrane geometry is often limited to be a flat type.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Investigation and On-Site Repair of Thin Pd-Ag Alloy Membranes

Tang

Bao

et al. 2020

Membranes

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Pd membranes act in an important role in H2 purification and H2 production in membrane reactors. Pd-Ag alloy membranes fabricated by consecutive electroless- and electroplating process on alumina tubes exhibited good stability under stringent heating/cooling cycles at a ramp rate of 10 K/min, imitating practical fast initiation or emergency shutdown conditions. Bilayer Pd-Ag membranes can form dense and uniform alloy after thermal treatment for 24 h at 823 K under H2 atmosphere, despite a porous structure due to the development of liquid-like properties above Tamman temperature to enforce the migrativity. On the contrary, alloying under N2 atmosphere resulted in a Pd-enriched layer. This led to a lower H2 flux but superior thermal stability compared to that alloying under H2 atmosphere. The trilayer approach of electroless-plated Pd, electro-polated Ag and electroless-plated Pd is not suitable to achieve homogeneous Pd-Ag alloys, which, on the other hand, presented the occurrence of a small gap between top Pd layer and middle Ag layer, probably due to insufficient wetting during plating process. An on-site repair treatment in analogous to MOCVD (Metal-organic Chemical Vapor Deposition) process was first proposed to extend the lifetime of Pd-Ag membrane, i.e., by vaporizing, and subsequent decomposition of Ag(OOCC2F5) powders to “preferentially” block the pinholes under vacuum and at working temperature of ca. 473–673 K, which effectively reduced the N2 flux by 57.4% compared to the initial value. The H2 flux, however, declined by 16.7% due to carbon deposition on the membrane surface, which requires further investigation. This approach shows some potential for on-site repair without disassembly or cooling to room temperature.

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“…This topic is completed with the work published by T.A. Peters et al [13], in which they analyze the flux-reducing tendency of Pd-Ag alloy membranes when operating with hydrogen mixtures containing certain hydrocarbons (butane and butylene) in a wide range of operating conditions. A slight decrease in the H 2 permeance is produced in the presence of butane, although the effect is almost immediately recovered when the hydrocarbon is removed from the mixture.…”

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confidence: 99%