Cu-Pd (Copper-Palladium)

Subramanian, P. R.; Laughlin, David E.

doi:10.1007/bf02645723

Cited by 211 publications

(147 citation statements)

References 39 publications

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“…As shown earlier [5], hydrogen separation membranes made of Cu-Pd alloys containing B2 structure perform better (higher hydrogen flux) than the Cu-Pd alloys with fcc structure. A sharp drop in hydrogen flux through these membranes is observed when the transition from B2 to fcc takes place.…”

Section: Discussionsupporting

confidence: 67%

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Ordered bcc phases in a Cu–Pd–Mg hydrogen separation membrane alloy

Doğan

Song

et al. 2012

Journal of Alloys and Compounds

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Surface poisoning and corrosion are shown to be the most significant degradation mechanisms acting on the hydrogen membrane materials at elevated temperatures in synthesis gas derived from coal. Among other metallic dense membrane materials, Cu-Pd alloys have demonstrated promise for being resistant against these degradation mechanisms. Also, it has been shown that Cu-Pd compositions containing ordered bcc (B2) crystal structure exhibit high hydrogen permeability. Magnesium was one of the elements that were found to extend the stability of the B2 phase field in Cu-Pd to higher temperatures. High-temperature XRD, SEM and TEM were utilized to characterize the structure of a Cu-43Pd-5.6Mg (in atomic percent) alloy. Two ordered phases with the same crystal structure (B2), but with different chemical compositions, were identified in the alloy. Transition temperature from these ordered bcc phases to the disordered fcc phase was significantly increased by addition of Mg compared to the binary Cu-48Pd alloy.

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Section: Discussionsupporting

confidence: 67%

“…The Cu-Pd binary system contains an ordered bcc (B2) phase field from about 35 at% Pd to 47 at% Pd at temperatures lower than 400°C [5]. The critical point of the B2 phase is at 598°C for a composition of 40 at% Pd.…”

Section: Introductionmentioning

confidence: 99%

Ordered bcc phases in a Cu–Pd–Mg hydrogen separation membrane alloy

Doğan

Song

et al. 2012

Journal of Alloys and Compounds

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“…Most of the bimetallic particles in the Pd 39 -Cu 61 /C sample ( Figure 4 D-F) were not well-crystalline, as revealed by their distorted lattice fringes and structurally disordered regions, whilst the crystal structure of the bimet- This chemically ordered structure has been proposed to exist in Pd-Cu systems within certain composition ranges (10-60 at % Pd) and at certain temperatures and pressures. [45] However, the observed chemically ordered Cu-Pd structure exhibited a gradual order-disorder transformation (i.e., a tendency to revert to a random mixture) under irradiation with an electron beam. In contrast to the samples with higher Cu content, a systematic analysis of about 100 individual nanoparticles at various crystallographic orientations from the Pd 85 -Cu 15 /C catalyst allowed us to exclude the presence of chemically ordered structures in this sample, that is, the bimetallic particles in the Pd 85 -Cu 15 /C catalyst were solely comprised of a random Pd-Cu solid-solution.…”

Section: Resultsmentioning

confidence: 98%

Supported Pd–Cu Bimetallic Nanoparticles That Have High Activity for the Electrochemical Oxidation of Methanol

Zhang

Zhou

Gao

et al. 2012

Chemistry A European J

165

116

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Monodisperse bimetallic Pd–Cu nanoparticles with controllable size and composition were synthesized by a one‐step multiphase ethylene glycol (EG) method. Adjusting the stoichiometric ratio of the Pd and Cu precursors afforded nanoparticles with different compositions, such as Pd85–Cu15, Pd56–Cu44, and Pd39–Cu61. The nanoparticles were separated from the solution mixture by extraction with non‐polar solvents, such as n‐hexane. Monodisperse bimetallic Pd–Cu nanoparticles with narrow size‐distribution were obtained without the need for a size‐selection process. Capping ligands that were bound to the surface of the particles were removed through heat treatment when the as‐prepared nanoparticles were loaded onto a Vulcan XC‐72 carbon support. Supported bimetallic Pd–Cu nanoparticles showed enhanced electrocatalytic activity towards methanol oxidation compared with supported Pd nanoparticles that were fabricated according to the same EG method. For a bimetallic Pd–Cu catalyst that contained 15 % Cu, the activity was even comparable to the state‐of‐the‐art commercially available Pt/C catalysts. A STEM‐HAADF study indicated that the formation of random solid‐solution alloy structures in the bimetallic Pd85–Cu15/C catalysts played a key role in improving the electrochemical activity.

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“…The Pd(111) peak appeared at 2y ¼ 40.358, 40.578, 40.668, 40.848, and 40.888 for the catalysts with Cu fractions of 0.14, 0.25, 0.40, 0.46, and 0.51, respectively. These shifts of the Pd(111) peak positions indicate the formation of an alloy of the Pd with the Cu having different lattice parameters [21]. In addition, the Pd(111) peak intensity decreased with an increase in the Cu fraction in the catalyst when the Pd concentration remained constant.…”

Section: Characterization Of the Catalystsmentioning

confidence: 97%

Applicability of a catalytic reduction method using a palladium–copper catalyst and hydrazine for the denitration of a highly concentrated nitrate salt solution

Kadowaki

Meguro

2012

Journal of Nuclear Science and Technology

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Denitration of a highly concentrated sodium nitrate (NaNO 3 ) aqueous solution via a catalytic reduction method using a palladium-copper catalyst supported on carbon powder (Pd-Cu/C) and hydrazine (N 2 H 4 ) was investigated. It was demonstrated that nitrate ion (NO 3 7 ) in a 5 mol L 71 NaNO 3 solution was completely reduced through an intermediate nitrite ion (NO 2 7) to nitrogen compounds such as nitrogen, nitrous oxide, and ammonia. By comparing the reaction rates of NO 3 7 and NO 2 7 obtained using catalysts with various Pd-Cu compositions and different reductants (hydrogen (H 2 ) or N 2 H 4 ), it was determined that the catalyst with a molar ratio of Pd:Cu ¼ 1:0.66 provides the maximum reaction rates for NO 3 7 and NO 2 7 using N 2 H 4 , and that not only the reactions of NO 3 7 and NO 2 7 but also that of N 2 H 4 were affected by the Pd-Cu composition.

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Cu-Pd (Copper-Palladium)

Cited by 211 publications

References 39 publications

Ordered bcc phases in a Cu–Pd–Mg hydrogen separation membrane alloy

Ordered bcc phases in a Cu–Pd–Mg hydrogen separation membrane alloy

Supported Pd–Cu Bimetallic Nanoparticles That Have High Activity for the Electrochemical Oxidation of Methanol

Applicability of a catalytic reduction method using a palladium–copper catalyst and hydrazine for the denitration of a highly concentrated nitrate salt solution

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