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Selective oxidation of carbon monoxide over CuO–CeO2 catalyst: Effect of hydrothermal treatment
Cited 58 time in
Web of Science
Cited 59 time in Scopus
- Authors
- Issue Date
- 2008
- Publisher
- Elsevier
- Citation
- Applied Catalysis B: Environmental 84 (2008) 426–432
- Keywords
- CuO–CeO2 catalyst ; Hydrothermal treatment ; Cu–Ce–O solid solution ; Selective oxidation of CO ; Phase separation ; Copper ; Ceria
- Abstract
- Copper oxide–ceria (CuO–CeO2) catalyst for selective oxidation of carbon monoxide (CO) was prepared
by co-precipitation and hydrothermal treatment methods and evaluated for catalytic activity in a
reformate gas composition which simulated the produced gas from methanol steam reforming. By
applying the condition of hydrothermal treatment, the catalytic activity of CuO–CeO2 catalyst was
increased and the operating temperature window, in which the concentration of carbon monoxide was
lower than 10 ppm, was widened. From the thermogravimetric (TG) results of hydrothermally treated
catalyst precursor, CuO–CeO2 catalyst did not show any improvement in physical properties such as
Brunauer Emmett Teller (BET) surface area, pore volume and average pore diameter, but the chemical
stability might be enhanced by hydrothermal treatment. By hydrothermal treatment, cuprous ion in the
CuO–CeO2 catalyst migrated to the surface of catalyst resulting in increased surface concentration of
copper and formation of cupric oxide on the surface of catalyst during calcination. While increasing the
calcination temperature (i.e. above 800 8C), the phase separation occurred with a part of copper and
cupric oxide was formed on the surface of catalyst which was observed in X-ray diffraction (XRD)
analysis.
- ISSN
- 0926-3373
- Language
- English
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