Improved catalytic activity under internal reforming solid oxide fuel cell over new rhodium-doped perovskite catalyst
- Improved catalytic activity under internal reforming solid oxide fuel cell over new rhodium-doped perovskite catalyst
- 윤성필; 함형철; 김군식; 그라지아 아카르도; Byung Yong Lee; Jooho Moon
- Issue Date
- Journal of power sources
- VOL 423-315
- The catalytic partial oxidation of methane is evaluated over a Rh (2– 15  mol%)-doped Sr0.92Y0.08TiO3-δ (SYT) perovskite-based catalyst prepared by the Pechini method for fuel-cell applications. The Rh dopant replaces titanium in the SYT catalyst, resulting in a catalyst with excellent and stable catalytic performance during thermal cycling in the temperature range 600– 900  °C and in long-term stability tests at 750  °C for 130  h, without deactivation due to carbon coking or sintering. A systematic round-robin characterization is carried out by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and CO chemisorption to establish the chemical and physical properties of the catalyst. Adding Rh as a dopant in the catalyst significantly promotes the catalytic activity due to the presence of exsoluted rhodium particles on the catalyst surface. Small particles (2– 5  nm) of Rh on the SYT surface are observed to be evenly dispersed, without agglomeration, and the turnover frequency (TOF) of the POM reaction increased. In the long-term stability tests, catalysts are tested in direct internal reforming at an SOFC anode, achieving high methane conversion (∼99%) in both dry and wet conditions.
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