Browsing by Author "Paulson, Scott"

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    Carbon Formation on Stainless Steel 304H in the Convection Section of an Ethane Cracking Plant
    (Taylor & Francis, 2015) Ramezanipour, Farshid; Singh, Anand; Paulson, Scott; Farag, Hany; Birss, Viola; Thangadurai, Venkataraman
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    Effect of sintering temperature on microstructure, chemical stability, and electrical properties of transition metal or Yb-doped BaZr0.1Ce0.7Y0.1M0.1O3?? (M = Fe, Ni, Co, and Yb)
    (Frontiers Media SA, 2014-03-13) Mirfakhraie, Behzad; Ramezanipour, Farshid; Paulson, Scott; Virss, Viola; Thangadurai, Venkataraman
    Perovskite-type BaZr0.1Ce0.7Y0.1M0.1O3?? (M = Fe, Ni, Co, and Yb) (BZCY-M) oxides were synthesized using the conventional solid-state reaction method at 1350–1550°C in air in order to investigate the effect of dopants on sintering, crystal structure, chemical stability under CO2 and H2S, and electrical transport properties. The formation of the single-phase perovskite-type structure with an orthorhombic space group Imam was confirmed by Rietveld refinement using powder X-ray diffraction for the Fe, Co, Ni, and Yb-doped samples. The BZCY-Co and BZCY-Ni oxides show a total electrical conductivity of 0.01 and 8 × 10?3 S cm?1 at 600°C in wet H2 with an activation energy of 0.36 and 0.41 eV, respectively. Scanning electron microscope and energy-dispersive X-ray analysis revealed Ba and Co-rich secondary phase at the grain-boundaries, which may explain the enhancement in the total conductivity of the BZCY-Co. However, ex-solution of Ni at higher sintering temperatures, especially at 1550°C, decreases the total conductivity of the BZCY-Ni material. The Co and Ni dopants act as a sintering aid and form dense pellets at a lower sintering temperature of 1250°C. The Fe, Co, and Ni-doped BZCY-M samples synthesized at 1350°C show stability in 30 ppm H2S/H2 at 800°C, and increasing the firing temperature to 1550°C, enhanced the chemical stability in CO2/N2 (1:2) at 25–900°C. The BZCY-Co and BZCY-Ni compounds with high conductivity in wet H2 could be considered as possible anodes for intermediate temperature solid oxide fuel cells.
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    Oxygen reduction at sol-gel derived La0.8Sr0.2Co0.8Feo.2O3 cathodes
    (Eslevier, 2006) Birss, Viola I.; Liu, Jingbo; Co, Anne C.; Paulson, Scott
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    Surface and bulk study of strontium-rich chromium ferrite oxide as a robust solid oxide fuel cell cathode
    (Royal Society of Chemistry, 2015) Chen, Min; Paulson, Scott; Kan, Wang Hay; Thangadurai, Venkataraman; Birss, Viola