The Activity of CeVO 4 -Based Catalysts for Ammonia-SCR: Impact of Surface Cerium Enrichment
- PDF / 2,337,205 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 87 Downloads / 153 Views
The Activity of CeVO4‑Based Catalysts for Ammonia‑SCR: Impact of Surface Cerium Enrichment Parnian Peyrovi1 · Sylvain Gillot1 · Jean‑Philippe Dacquin1 · Pascal Granger1 · Christophe Dujardin1 Received: 5 June 2020 / Accepted: 20 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The ammonia-SCR catalytic activity of unsupported CeVO4 with an excess of CeO2 was investigated in standard and fastSCR conditions. Solids were obtained from a hydrothermal synthesis route under a mild condition and then stabilized after aging in a wet atmosphere at 600 and 850 °C. Particular attention was paid to the role of excess C eO2 and the consequences of hydrothermal aging on physical–chemical properties and catalytic activity. The XRD patterns put into evidence the formation of the zircon-type structure of CeVO4 in agreement with a segregation of cubic face-centered structure of ceria (CeO2). Along with adding an excess of CeO2, high specific surface area (102 m 2/g) for the 11wt% CeO2/CeVO4 solid was obtained. The presence of CeO2 nanoparticles in addition to CeVO4 nanoparticles have limited the decrease in the specific surface area after aging at 600 and 850 °C. The catalyst with 11wt% CeO2/CeVO4 exhibited the best catalytic performances in standard and fast SCR conditions after thermal aging at 600 °C. Graphic Abstract
Keywords Ammonia-SCR · Nitrogen oxides · Nitrous oxide · Vanadium · CeVO4
1 Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03363-0) contains supplementary material, which is available to authorized users. * Christophe Dujardin [email protected] 1
University of Lille, CNRS, Centrale Lille, Artois University, UMR 8181, UCCS—Unité de Catalyse et Chimie du Solide, 59000 Lille, France
Nitrogen oxides (NOx) emitted from diesel engines are harmful to human health and environment. SCR of NOx with NH3 is considered to be the most efficient technology for reducing NOx emission in the presence of excess oxygen [1]. However, even though this technology has been available for decades for stationary sources, the improvement of the operating temperature window and hydrothermal stability of the SCR catalysts is a big challenge to meet the emission
13
Vol.:(0123456789)
standards of N Ox from mobile sources. Complex systems for the simultaneous treatment of N Ox, hydrocarbon, and soot have been introduced, which are generally expensive and can lead to the reduction of engine efficiency [2, 3]. The engine space limitation has forced manufacturers to seek an alternative solution with the combination of different aftertreatment components. The incorporation of SCR catalyst directly into the porosity of the diesel particle filter (DPF) would save space, money and simplify the post-processing vehicles equipped with a diesel engine. Such implementation requires improved thermal resistance of the SCR catalyst due to the exotherms related to the periodic regeneration of
Data Loading...
