Lean NOx Reduction by Hydrogen over Pt-Supported Rare Earth Oxide Catalysts and Their In Situ DRIFTs Study
Authors:
- 9 September 2009
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 82 (9) , 1197-1202
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.Keywords
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