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Catalytic Steam Methane Reforming Over Ir/Ce 0.9 Gd 0.1 O 2– x : Resistance to Coke Formation and Sulfur Poisoning
Author(s) -
Postole G.,
Girona K.,
Toyir J.,
Kaddouri A.,
Gélin P.
Publication year - 2012
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201100079
Subject(s) - catalysis , methane , steam reforming , chemistry , sulfur , hydrogen , oxide , methane reformer , carbon fibers , partial oxidation , coke , inorganic chemistry , nuclear chemistry , hydrogen production , materials science , organic chemistry , composite number , composite material
This work investigates the catalytic properties of Ir/Ce 0.9 Gd 0.1 O 2– x (Ir/CGO) catalyst and CGO support in steam reforming of methane in the absence or presence of H 2 S (50 ppm) for further application in a solid oxide fuel cell (SOFC) working under methane at intermediate temperatures and integrating a gradual internal reforming concept. The catalytic activity was measured at 750 °C by using a 50 mol.% CH 4 /5 mol.% H 2 O/45 mol.% N 2 mixture and a 10 mol.% CH 4 /90 mol.% N 2 mixture. The addition of Ir to CGO improves the catalytic activity in hydrogen production by two orders of magnitude with respect to that of CGO alone. Temperature programmed oxidation experiments were performed after reaction in both types of mixtures to study the eventual formation of carbon deposits. Over Ir/CGO, carbon formed in little amounts (even in the absence of H 2 O in the feed), being highly reactive toward O 2 . Upon H 2 S addition, the CGO support exhibited surprisingly an improved catalytic activity on the contrary to Ir/CGO which partly deactivated. Upon suppression of H 2 S in the feed the initial catalytic activity was fully restored for both catalysts. The catalytic behavior of CGO in the presence of H 2 S was discussed, based upon temperature programmed reaction of CH 4 .