Ceria-nano supported copper oxide catalysts for CO preferential oxidation: Importance of oxygen species and metal-support interaction
APPLIED SURFACE SCIENCE(2019)
Abstract
CeO2 with four different morphologies (sphere, rod, octahedron, cube) are used as the supports to synthesize the CuCe catalysts for the CO preferential oxidation in the H-2-rich gas and characterized by various techniques (TEM, HR-TEM, SEM, XRD, N-2 physisorption, XPS, Raman spectra, CO-TPD, CO-DRIFTS, O-2-TPD, CO pulses, H2TPR) to obtain an insight into the impact of the CeO2 morphology on the surface structure, composition and redox properties, especially the active species. The four supports expose {111}, {110} and {100} planes, and sphere-shape CeO2 has a higher ratio of {111}, which can form more reductive copper species and active oxygen species. And the catalytic performance followed by this order: spheres (28.5 kJ/mol) > rods (31.0 kJ/ mol) > octahedrons (34.1 kJ/mol) > cubes (40.3 kJ/mol). By further analysis of the characterization results, a series of structure-activity relationships are established to confirm that the active oxygen species is the decisive factor of preferential oxidation of CO in the H-2-rich stream.
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Key words
CO-PROX,CeO2 morphology,Active oxygen species,Interaction,Structural defects,Surface chemistry
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