Evidence of anti-coking behavior of La 0.8Sr 0.2Cr 0.98Ru 0.02O 3 as potential anode material for Solid Oxide Fuel Cells directly fed under methane
La 0.8Sr 0.2CrO 3 (LSC) based Ru catalysts are very active in methane steam reforming. Nevertheless, they can be easily poisoned under water-deficient conditions. Ru can be deposited as metallic ruthenium particles decorating the LSC grains or be inserted as Ru ions in the perovskite structure. Both Ru-promoted LSC catalysts were studied in methane steam reforming under water-deficient conditions and characterized after testing. Catalytic activity tests showed that ruthenium metal species are deactivated under water-deficient atmosphere, while ruthenium species inserted in LSC presented a remarkable stability and catalytic activity where residual steam plays a key role. Very unreactive carbon species responsible for deactivation were detected by temperature-programmed oxidation and transmission electron microscopy over metallic ruthenium species. Such species were not observed when ruthenium species are inserted and stabilized into the LSC structure. La 0.8Sr 0.2Cr 0.98Ru 0.02O 3 appears therefore as a highly promising anti-coking anode material for Solid Oxide Fuel Cells directly fed with methane or natural gas and operating under water-deficient conditions. © 2012 Elsevier Inc. All rights reserved.
Keywords: Anode material ; Anodes ; Carbon ; Carbon deposition ; Carbon species ; Catalyst activity ; Chromium ; Internal reforming ; Internal steam reforming of methane ; Lanthanum ; Lanthanum chromite ; Metal species ; Methane ; Methane steam reforming ; Perovskite ; Perovskite structures ; Ru catalysts ; Ru-promoted Sr-substituted lanthanum chromite ; Ruthenium ; Ruthenium species ; Solid Oxide Fuel Cell ; Solid oxide fuel cells (SOFC) ; Steam reforming ; Steam reforming of methane ; Temperature programmed oxidation ; Transmission electron microscopy
Record created on 2014-11-14, modified on 2016-08-09