Abstract
Abstract The Pt-supported rare earth oxide (CeO2, Pr6O11, Eu2O3, and Gd2O3) catalysts were prepared and their selective catalytic reduction (SCR) characteristics for NOx using hydrogen were investigated under 10 vol % excess oxygen conditions. Among them, only the Pt/CeO2 catalyst provided good NO conversion (ca. 80%) with ca. 40% N2 selectivity. Other catalysts hardly showed NOx reduction activity due to the high solid basicity of supporting materials. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) measurements for the Pt/CeO2 catalyst were performed to obtain the specific adsorption bands assigned to NO3− species, indicating that NOx reduction proceeds via formation of such nitrate.
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