High Intrinsic Catalytic Activity of CeVO4-Based Catalysts for Ammonia-SCR: Influence of pH During Hydrothermal Synthesis
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The catalytic activity of unsupported CeVO4 solid was investigated in ammonia-SCR at various NO/NOx ratio. CeVO4 structure was obtained from a straightforward hydrothermal synthesis route under mild conditions and then stabilized after ageing in wet atmosphere at 600 °C. The influence of pH measured after the hydrothermal treatment could be a crucial parameter to get optimal bulk and surface properties. The evolution of intrinsic catalytic activity was compared with regards to bulk and surface properties extracted from extensive characterization. The stabilization of V5+ in CeVO4 structure during NH3-SCR reactions was observed even after thermal aging at high temperature. This opens new perspectives for vanadium-based catalysts in mobile sources applications.
KeywordsAmmonia-SCR Nitrogen oxides Nitrous oxide Vanadium CeVO4
The authors gratefully acknowledge financial support for this work from the French National Agency for Research (UREENOx Project, No. ANR-11-VPTT-002). The FEDER, the CNRS, the Région Nord Pas-de-Calais and the Ministère de l’Education Nationale de l’Enseignement Supérieur et de la Recherche are acknowledged for fundings of XPS/LEIS/ToF–SIMS spectrometers within the Pôle Régional d’Analyses de Surface and X-ray diffractometers. The authors want to thank Pr Rose-Noëlle Vannier for the opportunity to make first catalytic measurements with CeVO4 sample obtained through solid-state synthesis method.
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