Sintering of Mixed-Conducting Composites for Hydrogen Membranes from Nanoscale Co-Synthesized Powders

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The potential for highly selective, nongalvanic permeation of hydrogen through dense mixed conducting composites at elevated temperatures makes them attractive as hydrogen separation membranes. The glycine-nitrate combustion synthesis technique has been used to co-synthesize a cation-doped barium cerate protonic conducting phase together with a metallic nickel electronic conducting phase (15-35 vol% Ni). Co-synthesis of these phases results in an intimately mixed powder with particle sizes on the order of 10 nm. DTA/TGA of all as-synthesized compositions determined that a calcination temperature of 1000°C was required for full reaction of the cerate components. DTA/TGA and sintering shrinkage dilatometry were performed on calcined powders to determine that a sintering temperature of 1250°C would be adequate for achieving >90% relative density in all compositions. Bars of the material containing 25 vol% Ni were reduced at three different points in the heat treatment process (e.g., before, during, or after sintering). It was determined that there was less porosity in the sample reduced during sintering than any other. It was also seen on SEM that the primary grain size, regardless of when reduction occurred compared to sintering of the material, is less than 5 8m.

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Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

1415-1420

DOI:

10.4028/www.scientific.net/MSF.539-543.1415

Citation:

N. L. Canfield et al., "Sintering of Mixed-Conducting Composites for Hydrogen Membranes from Nanoscale Co-Synthesized Powders", Materials Science Forum, Vols. 539-543, pp. 1415-1420, 2007

Online since:

March 2007

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$35.00

[1] Y.S. Lin, Microporous and Dense Inorganic Membranes: Current Status and Prospective, Separation and Purification Technology 25, 39-55 (2001).

DOI: 10.1016/s1383-5866(01)00089-2

[2] W.D. Breck, Zeolite Molecular Sieves, John Wiley & Sons, Inc., New York, NY (1974) p.636.

[3] B.L. Bischoff, R.R. Judkins, and T.R. Armstrong, Microporous Inorganic Membranes for Hydrogen Purification, presented at the DOE Hydrogen Separations Workshop, Arlington, VA (Sep. 2004).

[4] D.J. Edlund, Hydrogen Separation and Purification Using Dense Metallic Membranes, presented at the DOE Hydrogen Separations Workshop, Arlington, VA (Sep. 2004).

[5] T. Sammells, Ionically Conducting Membranes for Hydrogen Production and Separation, presented at the DOE Hydrogen Separations Workshop, Arlington, VA (Sep. 2004).

[6] G. Alberti and M. Casciola, Solid State Protonic Conductors, Present Main Applications and Future Prospects, Solid State Ionic 145 [1-4], 3-16 (2001).

DOI: 10.1016/s0167-2738(01)00911-0

[7] T. Norby and Y. Larring, Mixed Hydrogen Ion-Electronic Conductors for Hydrogen Permeable Membranes, Solid State Ionics 136, 139-148 (2000).

DOI: 10.1016/s0167-2738(00)00300-3

[8] T. Norby, Solid-State Protonic Conductors: Principles, Properties, Progress and Prospects, Solid State Ionics 125 [1-4], 1-11 (1999).

DOI: 10.1016/s0167-2738(99)00152-6

[9] K.D. Kreuer, Proton-conducting oxides, Annual Review of Materials Research 33, 333-359 (2003).

[10] U. Balachandran, T. H. Lee, S. Wang, J. J. Picciolo, J. T. Dusek, and S. E. Dorris, Dense Cermet Membranes for Hydrogen Separation, Am. Chem. Soc., Fuel Chem. Div., Prepr. Paper 48.

[1] 134 (2003).

[11] G. Zhang, S.E. Dorris, U. Balachandran, and M. Liu, Interfacial Resistances of NiBCY Mixed-Conducting Membranes for Hydrogen Separation, Solid State Ionics 159, 121-34 (2003).

DOI: 10.1016/s0167-2738(02)00871-8

[12] L.A. Chick, L.R. Pederson, G.D. Maupin, J.L. Bates, L.E. Thomas, and G.J. Exarhos, Glycine-nitrate combustion synthesis of oxide ceramic powders, Mater. Lett., 10, 6 (1990).

DOI: 10.1016/0167-577x(90)90003-5

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