Abstract
Nb/CeO2 catalysts with different morphologies for the selective catalytic reduction of NOx with NH3 (NH3-SCR) were fully studied. A Nb/CeO2 nanoparticle catalyst presented better NH3-SCR performance than Nb/CeO2 nanorods, and a Nb/CeO2 nanocube catalyst presented the lowest NOx conversion. Transmission electron microscopy, N2 physisorption, X-ray powder diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction with H2 (H2-TPR), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were used to characterize the samples. The obtained results reveal that larger specific surface area, more abundant surface oxygen species and acid sites, lower crystallinity, and stronger redox capability of the Nb/CeO2 nanoparticle catalyst all contributed to its better NH3-SCR performance.
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