Improvement of high temperature stability of Pd coating on Nb by intermediate layer comprising NbC and Nb2C

Hatano, Yuji; Ishiyama, Keita; Homma, Hiroomi; Watanabe, Kuniaki

doi:10.1016/j.jallcom.2007.01.101

Cited by 14 publications

(2 citation statements)

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“…9,10 Membrane operation above 673 K reduces DBTC constraints and enables application in membrane reactors where kinetic limitations require higher temperatures such as ammonia decomposition and steam methane reforming. 11 Interdiffusion barriers physically separate Pd and V, which allows for operation at >673 K. Several studies demonstrate effective interdiffusion barriers with the following materials: Al 2 O 3 , 12 NbC, 13,14 Y, 15,16 HfN, 17 and Mo 2 C. 18 Alternatively, non-Pd coatings that do not interdiffuse with V can be applied. Our group demonstrated the functionality of the transition metal carbide (TMC) Mo 2 C as a stable alternative to Pd.…”

Section: Introductionmentioning

confidence: 99%

Application of TiC in Vanadium-Based Hydrogen Membranes

Fuerst

Petsalis

Wolden

et al. 2018

Ind. Eng. Chem. Res.

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Transition metal carbide coated vanadium membranes for hydrogen permeation have the unique ability to operate at both high temperatures and pressures. Titanium carbide deposited by magnetron sputtering produced dense, nanocrystalline films preferentially oriented in the ( 111) plane. When applied on vanadium foils, TiC was a highly active catalytic coating enabling permeation of ultrapure H 2 with fluxes up to 0.71 mol m −2 s −1 at 10 bar and 923 K. The TiC thickness controlled H 2 transport in the composite membranes. Thicker TiC films and low temperature operation yielded n-values >1, which were likely resultant of adsorption effects and surface diffusion through the carbide layer. Competitive adsorption in mixed gas environments inhibited H 2 flux through TiC/V membranes, but addition of thin (50−100 nm) Pd films to the TiC surface instilled chemical resistance and improved permeation at 773 K. Permeation attenuated for membranes with TiC thicknesses <20 nm but 23 nm thick coatings demonstrated stable flux for 30 h.

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Section: Introductionmentioning

confidence: 99%

Application of TiC in Vanadium-Based Hydrogen Membranes

Fuerst

Petsalis

Wolden

et al. 2018

Ind. Eng. Chem. Res.

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“…[4][5][6][7] Hence, these carbides can be potential candidates for functional materials in the field of hydrogen energy. For example, Hatano et al 8) have reported that NbC acts as intermediatelayer to improve high temperature stability of thin Pd layer in Pd-Nb-Pd composite membrane for hydrogen separation as well as Nb 2 C. Gringoz et al 9) have recently found that hydrogen can be electrochemically charged and discharged in TiC 0:6 even at room temperature up to 2.9 mass%; TiC 0:6 can be a potential candidate for hydrogen storage material. For these applications, i.e., hydrogen separation and storage, high hydrogen solubility and diffusivity are preferable.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Composition Isotherms of TiC<SUB>1−<I>x</I></SUB>–H System at Elevated Temperatures

2011

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Pressure-composition isotherms of TiC 1Àx -H system were measured at 773, 873 and 973 K over a pressure range from 10 À2 to 10 5 Pa. The obtained isotherms could be divided in three concentration regions. In the low concentration region in which ½H=½TiC 1:4 Â 10 À3 , Sieverts' law held, and the solubility of hydrogen clearly increased with decreasing temperature. The enthalpy of solution was À70 AE 5 kJ mol À1 . In the region in which 1:4 Â 10 À3 < ½H=½TiC 8:0 Â 10 À3 , the dependence of hydrogen concentration, C H , on pressure and temperature weakened as pressure increased. Finally, C H was independent of temperature when it reached 8:0 Â 10 À3 . This C H was comparable with the concentration of carbon vacancies in TiC 1Àx . In the high concentration region in which ½H=½TiC ! 8:0 Â 10 À3 , Sieverts' law held again, but the solubility of hydrogen was almost independent of temperature. These observations indicated that hydrogen dissolved in carbon vacancies in the low and middle concentration regions with the above-mentioned value of enthalpy of solution, and also occupied much less stable sites in the high concentration region.

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Improvement of high temperature stability of Pd coating on Ta by HfN intermediate layer

Nozaki

Hatano

Yamakawa

et al. 2010

International Journal of Hydrogen Energy

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Improvement of high temperature stability of Pd coating on Nb by intermediate layer comprising NbC and Nb2C

Cited by 14 publications

References 13 publications

Application of TiC in Vanadium-Based Hydrogen Membranes

Application of TiC in Vanadium-Based Hydrogen Membranes

Pressure-Composition Isotherms of TiC<SUB>1−<I>x</I></SUB>–H System at Elevated Temperatures

Improvement of high temperature stability of Pd coating on Ta by HfN intermediate layer

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Improvement of high temperature stability of Pd coating on Nb by intermediate layer comprising NbC and Nb2C

Cited by 14 publications

References 13 publications

Application of TiC in Vanadium-Based Hydrogen Membranes

Application of TiC in Vanadium-Based Hydrogen Membranes

Pressure-Composition Isotherms of TiC<SUB>1&minus;<I>x</I></SUB>&ndash;H System at Elevated Temperatures

Improvement of high temperature stability of Pd coating on Ta by HfN intermediate layer

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Pressure-Composition Isotherms of TiC<SUB>1−<I>x</I></SUB>–H System at Elevated Temperatures