Preparation and Application of Nano Ce-Zr Mixed Oxides Supported H3PW12O40 in Nitrogen Oxide Capture and Decomposition

Lin Cheng; Rui Wang

doi:10.4028/www.scientific.net/MSF.745-746.485

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HomeMaterials Science ForumMaterials Science Forum Vols. 745-746Preparation and Application of Nano Ce-Zr Mixed...

Preparation and Application of Nano Ce-Zr Mixed Oxides Supported H3PW12O40 in Nitrogen Oxide Capture and Decomposition

Abstract:

In this study, nanoCe-Zr mixed oxides (CeZrO) were prepared, and XRD, BET surface areas, TEM and TPD-MS were employed for characterization and mechanism analysis. CeZrO was initially used as support for solid tungstophosphoric acid (H₃PW₁₂O₄₀ or HPW) and was found to have promotion effect on the adsorption and decomposition of NOx. After loading with HPW, the NO_x adsorption efficiency increased, and the highest efficiency of HPW/CeZrO was 98%, much higher than that of pure HPW (ca. 60%). With the increase of HPW loading, the NO_x adsorption efficiency tended to reach a peak value before dropping down. The mechanical grinding method was much more suitable than the incipient impregnation method for CeZrO to load HPW. Furthermore, the adsorbed NO_x was found to decompose into N₂, O₂ and N₂O, and yields of N₂ of 29.7% for HPW/CeZrO was obtained upon heating at a ramp rate of 50 °C/min.

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Materials Science Forum (Volumes 745-746)

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485-490

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https://doi.org/10.4028/www.scientific.net/MSF.745-746.485

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February 2013

Authors:

Lin Cheng, Rui Wang

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Adsorption-Decomposition, H₃Pw₁₂O₄₀, Nano Ce-Zr Mixed Oxides, NO_x

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