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24.08.2019 | Special Issue: In Recognition of Professor Wolfgang Grünert's Contributions to the Science and Fundamentals of Selective Catalytic Reduction of NOx

CuO/Zn-CeO₂ Nanocomposite as an Efficient Catalyst for Enhanced Diesel Soot Oxidation

verfasst von: Perala Venkataswamy, Deshetti Jampaiah, Deboshree Mukherjee, Benjaram M. Reddy

Erschienen in: Emission Control Science and Technology | Ausgabe 4/2019

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Abstract

Development of non-noble metal catalysts with improved structural, surface, and redox properties for catalytic soot oxidation has gained an enormous interest. Among practical alternatives, ceria-supported transition metal oxides have been proved to be the satisfactory catalysts for soot oxidation due to their outstanding redox properties and oxygen transfer capability promoted by the strong interaction between metal oxide and ceria interfaces. Following the above considerations, in the present work, CuO/Zn-CeO₂ nanocomposite was prepared by a wet impregnation method and investigated for catalytic soot oxidation. To probe the significance of nanocomposites, pure counterparts, namely, CuO/CeO₂, CuO/ZnO, and Zn-CeO₂, were also synthesized. Various characterization techniques, namely, TEM-HRTEM, N₂O chemisorption, XRD, ICP-OES, BET, Raman, XPS, and H₂-TPR, were employed to investigate the structural, surface, and redox properties. Pure CuO/ZnO and CuO/CeO₂ catalysts showed a soot oxidation activity with a T₅₀ of 613 and 526 °C, respectively, under the practical conditions of NO concentration of 500 ppm and 20% O₂. Interestingly, the CuO/Zn-CeO₂ nanocomposite exhibited a remarkable higher soot oxidation activity with a T₅₀ of 460 °C. The enhancement in the soot oxidation activity has been attributed to a strong interaction between the highly dispersed CuO and Zn-CeO₂ support, which resulted in the desired textural properties and abundant surface defects (Ce³⁺ species as well as oxygen vacancies). In addition, the long-term stability test verifies an excellent reusability of the CuO/Zn-CeO₂ nanocomposite towards soot oxidation without appreciable loss in the activity. The present study demonstrates the significance of ceria-based nanocomposite catalysts for environmental pollutant abatement.

Vorheriger Artikel Laser Raman Spectroscopic Investigation on the Conversion of Molten Urea into NH3 for the Selective Catalytic Reduction of NOx in Oxygen-Rich Exhaust Gases

Nächster Artikel Studies on the Solid Oxide Cell Perovskite Electrode Materials for Soot Oxidation Activity

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Titel: CuO/Zn-CeO2 Nanocomposite as an Efficient Catalyst for Enhanced Diesel Soot Oxidation
verfasst von: Perala Venkataswamy
Deshetti Jampaiah
Deboshree Mukherjee
Benjaram M. Reddy
Publikationsdatum: 24.08.2019
Verlag: Springer International Publishing
Erschienen in: Emission Control Science and Technology / Ausgabe 4/2019
Print ISSN: 2199-3629
Elektronische ISSN: 2199-3637
DOI: https://doi.org/10.1007/s40825-019-00137-y

Special Issue: In Recognition of Professor Wolfgang Grünert's Contributions to the Science and Fundamentals of Selective Catalytic Reduction of NOx

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