Removal of NOx and soot over Ce/Zr/K/Me (Me = Fe, Pt, Ru, Au) oxide catalysts

Matarrese, Roberto; Morandi, Sara; Castoldi, L.; Villa, P. L.; Lietti, Luca

doi:10.1016/j.apcatb.2016.07.013

Cited by 53 publications

(33 citation statements)

References 74 publications

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“…The key challenge is to find a catalyst that can achieve a high rate of soot oxidation in combination with substantial NOx reduction at sufficiently low temperature. Several kinds of catalysts such as precious metals [436][437][438][439], transition metal oxides [440], alkaline metal oxides [441], perovskite-like type oxides [442][443][444][445][446], and ceria-based oxides [285,447,448] have shown good catalytic activities for simultaneous removal of NOx and soot. Especially, CZO is one of the key components owing to its excellent OSC property and robust stability [156,214].…”

Section: Nanosize Cerium-zirconium-based Solid Solutions For Simultanmentioning

confidence: 99%

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Liu

Zhang

Chen

et al. 2019

Chinese Journal of Catalysis

103

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Section: Nanosize Cerium-zirconium-based Solid Solutions For Simultanmentioning

confidence: 99%

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Liu

Zhang

Chen

et al. 2019

Chinese Journal of Catalysis

103

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“…Since ceria-based oxides are recognized among the most promising materials for soot combustion [62,117], ceria/zirconia (CZ)-based catalysts, doped with Pt, Au, Ru, or Fe and containing K, have been considered for both soot oxidation and simultaneous removal of NO x by Matarrese et al [118]. The results pointed out that all the CZ formulations and in particular the Ru-containing catalysts are able to decrease the soot ignition temperature in the presence of only oxygen at temperatures below 300 • C. Moreover, when operating under isothermal cycling conditions the Ru-based catalysts were found much more active than Pt-K/Al 2 O 3 in both soot combustion and NO x storage capacity.…”

Section: Pt-free Dpnr Systemsmentioning

confidence: 99%

“…In particular, several recent studies [119,120] reported that at high temperatures (i.e., higher than 700 • C) RuO 2 is oxidized into volatile RuO 4 . Notably, focusing on this crucial aspect, Villani et al [121] investigated the stability of Ru/Zeolite based catalysts and found 900 • C as the upper limit temperature for practical applications of ruthenium catalysts, while Matarrese et al [118] performed repeated TPO soot oxidation cycles reporting a quite stable and reproducible behavior.…”

Section: Pt-free Dpnr Systemsmentioning

confidence: 99%

An Overview on the Catalytic Materials Proposed for the Simultaneous Removal of NOx and Soot

Castoldi

2020

Materials

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Vehicular pollution has become a major problem in urban areas due to the exponential increase in the number of automobiles. Typical exhaust emissions, which include nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO), soot, and particulate matter (PM), doubtless have important negative effects on the environment and human health, including cardiovascular effects such as cardiac arrhythmias and heart attacks, and respiratory effects such as asthma attacks and bronchitis. The mitigation measures comprise either the use of clean alternative fuels or the use of innovative technologies. Several existing emission control technologies have proven effective at controlling emissions individually, such as selective catalytic reduction (SCR) and lean NOx trap (LNT) to reduce NOx and diesel particulate filter (DPF) specifically for PM abatement. These after-treatment devices are the most profitable means to reduce exhaust emissions to acceptable limits (EURO VI norms) with very little or no impact on the engine performances. Additionally, the relative lack of physical space in which to install emissions-control equipment is a key challenge for cars, especially those of small size. For this reason, to reduce both volume and cost of the after-treatment devices integrated catalytic systems (e.g., a sort of a “single brick”) have been proposed, reducing both NOx and PM simultaneously. This review will summarize the currently reported materials for the simultaneous removal of NOx and soot, with particular attention to their nature, properties, and performances.

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“…In the regeneration process, oxidation of PM is carried out to make the filter re-usable. Without either a catalyst material coated on the filter or the assistance of a highly active oxidiser such as NO₂, PM is completely oxidised by oxygen only at the temperatures higher than 600 °C [1][2][3], which is much higher than the exhaust temperature of a light-duty diesel engine.…”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of diesel particulate matter by using silver and ceria supported on alumina as the oxidation catalyst

Sawatmongkhon

Theinnoi

Wongchang

et al. 2019

Applied Catalysis A: General

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Removal of NOx and soot over Ce/Zr/K/Me (Me = Fe, Pt, Ru, Au) oxide catalysts

Cited by 53 publications

References 74 publications

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

An Overview on the Catalytic Materials Proposed for the Simultaneous Removal of NOx and Soot

Catalytic oxidation of diesel particulate matter by using silver and ceria supported on alumina as the oxidation catalyst

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