Abstract
An environmentally benign WO3 wrapped cubic CeO2 core–shell catalyst (Ce@W) was developed for the selective catalytic reduction of NOx with NH3. Compared with CeW particles prepared via the conventional co-precipitation method, this core–shell catalyst not only displays higher tolerance to SO2 and H2O, but also exhibits a wider activity temperature window of 250–450 °C, in which NOx conversion and N2 selectivity reaches 100%. The improved performance of Ce@W catalysts can be contributed to the strong interactions between CeO2 (100) and WO3, which generates more Ce3+ and surface chemisorbed oxygen. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) reveal that the more thermally stable Brønsted acid sites on Ce@W lead to its excellent high-temperature activity.
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