Journal
JOURNAL OF RARE EARTHS
Volume 32, Issue 2, Pages 139-145Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(14)60043-0
Keywords
CuO/CeO2 catalysts; CO pretreatment; oxygen vacancies; NO reduction; rare earths
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Funding
- National Basic Research Program of China [2010CB732300]
- National Natural Science Foundation of China [21273110, 20973091]
- Natural Science Foundation for the Youth [21203091]
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The CuO/CeO2 catalysts were investigated by means of X-ray diffraction (XRD), laser Raman spectroscopy (LRS), X-ray photoelectronic spectroscopy (XPS), temperature-programmed reduction (TPR), in situ Fourier transform infrared spectroscopy (FTIR) and NO+CO reaction. The results revealed that the low temperature (<150 degrees C) catalytic performances were enhanced for CO pretreated samples. During CO pretreatment, the surface Cu+/Cu-0 and oxygen vacancies on ceria surface were present. The low valence copper species activated the adsorbed CO and surface oxygen vacancies facilitated the NO dissociation. These effects in turn led to higher activities of CuO/CeO2 for NO reduction. The current study provided helpful understandings of active sites and reaction mechanism in NO+CO reaction.
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