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12.12.2018

Enhancing low-temperature NO_x storage and reduction performance of a Pt-based lean NO_x trap catalyst

verfasst von: Tong Wang, Li-Wei Jia, Xiu-Ting Wang, Gang Wang, Fu-Qiang Luo, Jia-Ming Wang

Erschienen in: Rare Metals | Ausgabe 1/2019

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Abstract

Two lean NO_x trap (LNT) catalysts, Pt/BaO/CeO₂ + Al₂O₃ and Pt/BaO/CeO₂ − Al₂O₃, were prepared and compared for low-temperature (< 250 °C) NO_x storage and reduction performance. The influence of the form of ceria on low-temperature NO_x storage and reduction performance of LNT catalysts was investigated with the focus on NO_x storage capacity, NO_x reduction efficiency during lean/rich cycling, product selectivity and thermal stability. Inductively coupled plasma-atomic emission spectrometry (ICP-AES), Brunner–Emmet–Teller (BET), H₂-pulse chemisorption and X-ray diffraction (XRD) were conducted to characterize the physical properties of LNT catalysts. NO_x storage capacity and NO_x conversion efficiency were measured to evaluate NO_x storage and reduction performance of LNT catalysts. Pt/BaO/CeO₂ − Al₂O₃ catalyst exhibits higher NO_x storage capacity than Pt/BaO/CeO₂ + Al₂O₃ catalyst in the temperature range of 150–250 °C. Meanwhile, Pt/BaO/CeO₂ − Al₂O₃ catalyst shows better NO_x conversion efficiency and N₂ selectivity. XRD results indicate that the thermal stability of CeO₂ − Al₂O₃ complex oxide is superior to that of pure CeO₂. H₂-pulse chemisorption results show that Pt/BaO/CeO₂ − Al₂O₃ catalyst has higher Pt dispersion than Pt/BaO/CeO₂ + Al₂O₃ catalyst over fresh and aged samples. The improved physical properties of Pt/BaO/CeO₂ − Al₂O₃ catalyst are attributed to enhance the NO_x storage and reduction performance over Pt/BaO/CeO₂ + Al₂O₃ catalyst.

Vorheriger Artikel Solvothermal synthesis of nano-CeO2 aggregates and its application as a high-efficient arsenic adsorbent

Nächster Artikel Mechanism of aluminum complexation in oxidative activity of leaching bacteria in a fluoride-containing bioleaching system

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Titel: Enhancing low-temperature NOx storage and reduction performance of a Pt-based lean NOx trap catalyst
verfasst von: Tong Wang
Li-Wei Jia
Xiu-Ting Wang
Gang Wang
Fu-Qiang Luo
Jia-Ming Wang
Publikationsdatum: 12.12.2018
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 1/2019
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-018-1184-x

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