Performance of Pt-Fe/mordenite monolithic catalysts for preferential oxidation of carbon monoxide in a reformate gas for PEFCs

• Published in: Applied catalysis. A, General Vol. 341; no. 1; pp. 93 - 97
• Main Authors: Maeda, Nobutaka, Matsushima, Takaaki, Uchida, Hiroyuki, Yamashita, Hisao, Watanabe, Masahiro
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2008; Elsevier
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Ion-exchange; Long-term durability; Monolith; PEFC; Preferential oxidation of carbon monoxide; Pt-Fe/mordenite catalyst; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolites: preparations and properties; Preferential oxidation of carbon monoxide; Pt-Fe/mordenite catalyst; Long-term durability; Monolith; PEFC; Heterogeneous catalysis; Mordenite; Preferential oxidation of carbon monoxide;Pt-Fe/mordenite catalyst;Monolith;Long-term durability;PEFC; Oxidation; Zeolite; Carbon monoxide; Carbon; Catalyst; Molecular sieve
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2008.02.022

Pt-Fe/mordenite catalysts coated on ceramic straight-channel monoliths were evaluated for the preferential oxidation of carbon monoxide (PROX) in hydrogen-rich gas streams. In a feed gas containing 1% CO, 1% O 2, with the balance H 2, CO conversion reached almost 100% at temperatures ranging from 100 to 130 °C, i.e., an outlet CO concentration of less than 10 ppm. Even in a synthetic reformate gas (1% CO, 1% O 2, 15% H 2O, 20% CO 2, balance H 2), the monolithic catalyst exhibited excellent activity, reducing the CO concentration to less than 100 ppm. In particular, under optimized conditions, an outlet CO concentration of less than 10 ppm was realized. This is the first report that has demonstrated that monolithic catalysts could achieve the 10-ppm target level at a low O 2/CO ratio and a high space velocity in a single-stage reactor. Excellent durability of the monolithic catalyst is expected, based on a lack of deterioration in performance during 500 h of operation. Pt-Fe/mordenite catalysts coated on ceramic monoliths were evaluated for the preferential oxidation of carbon monoxide (PROX) in hydrogen-rich gas stream. The monolithic catalyst exhibited an excellent activity, reducing CO concentration to less than 10 ppm under optimized conditions. This is the first report that has demonstrated that monolithic catalysts could achieve the 10 ppm target level at a low O 2/CO ratio and a high space velocity. ▪