Selective low-temperature CO oxidation over Pt-Co-Ce/Al2O 3 in hydrogen-rich streams
Applied Catalysis A: General, cilt.292, sa.1-2, ss.171-176, 2005 (Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 292 Sayı: 1-2
- Basım Tarihi: 2005
- Doi Numarası: 10.1016/j.apcata.2005.06.002
- Dergi Adı: Applied Catalysis A: General
- Derginin Tarandığı İndeksler: Scopus
- Sayfa Sayıları: ss.171-176
- Anahtar Kelimeler: Fuel cell, Fuel processor, Pt-Co-Ce/Al2O3 catalyst, Selective CO oxidation
- Boğaziçi Üniversitesi Adresli: Evet
Özet
The selective low-temperature oxidation of CO was studied in hydrogen-rich streams over Pt-Co-Ce/Al2O3 catalysts, which were prepared using the incipient to wetness co-impregnation technique. The effects of reaction temperature and feed composition on CO conversion and selectivity were investigated in a flow micro-reactor system. The 100% CO conversion was achieved over 1.4 wt% Pt-1.25 wt% Co-1.25 wt% Ce/Al2O3 with significantly high selectivity at a reaction temperature of 90°C using a feed composition of 1.0% CO, 1.0% O2, 60% H2 and He as balance at a space velocity of 24,000 cm3/(g h). Addition of 25% CO2 and 10% H2O into the feed increased the reaction temperature to 110°C but allowed 100% CO conversion for 300 min time-on-stream. It was concluded that this catalyst may have great potential for removing CO in the hydrogen stream from a fuel processor for fuel cell applications, considering the fact that it may operate at significantly lower temperatures and O2/CO ratios compared to other alternatives reported in the literature. © 2005 Elsevier B.V. All rights reserved.