Simultaneous removal of soot and NO  over K- and Ba-doped ruthenium supported catalysts

Matarrese, Roberto; Aneggi, Eleonora; Castoldi, L.; Llorca, Jordi; Trovarelli, Alessandro; Lietti, Luca

doi:10.1016/j.cattod.2015.12.016

Cited by 23 publications

(20 citation statements)

References 75 publications

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“…Equations E5 and E6 represent the formation of SOCs in the presence of NO2 [10], [36], [45], [46], [47]. The formation of SOCs may occur via direct interaction of free NO2 present in the feed gas with soot (E5) or from the nitrates stored on manganese oxides (E6) at lower temperatures [10], [45], [48], [49].…”

Section: Discussionmentioning

confidence: 99%

Mesoporous manganese oxides for NO2 assisted catalytic soot oxidation

Wasalathanthri

SantaMaria

Kriz

et al. 2017

Applied Catalysis B: Environmental

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Air pollution issues due to soot/diesel particulate matter (DPM) emitted from incomplete burning of diesel fuel have become a global issue in this century. A series of manganese oxides, namely amorphous manganese oxide (Meso-Mn-A), Mn2O3 (Meso-Mn2O3), MnO2 (epsilon phase) (Meso-ϵ-MnO2) and octahedral molecular sieves MnO2 (Meso-OMS-2) was synthesized via a soft template method. The potential of mesoporous manganese oxides in acceleration of NO2 assisted catalytic oxidation of diesel soot (Printex-U) under lean conditions was investigated. The physiochemical properties of synthesized materials were systematically characterized by X-ray diffraction, N2-sorption, high-resolution transmission electron microscopy, and H2-temperature programmed reduction. A series of temperature programmed oxidation experiments was carried out to investigate the effect of feed gas composition on activity of the catalyst, and TGA-MS experiments were done to calculate the kinetic energy for each system. Mesoporous manganese oxides were found to be effective for complete oxidation of diesel soot under exhaust gas temperatures, and activities of all the manganese oxides were increased in the presence of NO2 in the feed gas. Meso-ϵ-MnO2 possesses the highest performance, exhibiting the lowest Ti and Tm (230 °C and 305 °C), the narrowest temperature range (75 °C), and the lowest Ea (298 kJ/mol).

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Section: Discussionmentioning

confidence: 99%

Mesoporous manganese oxides for NO2 assisted catalytic soot oxidation

Wasalathanthri

SantaMaria

Kriz

et al. 2017

Applied Catalysis B: Environmental

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“…Soot particulates (lab synthesized) and catalyst was carefully mixed, in the weight ratio of 1/20 for a "loose" contact and "tight" contact as well, between the soot particulates and the catalyst, and then placed onto the glass wool bed in the reactor. The catalytic activity was evaluated by recording the variation in NO ppm being observed in the NO analyser and evolution of CO2 gas as a result of soot combustion by analyzing the outlet gasses with the help of GC as discussed previously [21][22][23][24][25][26].…”

Section: Reaction Conditionsmentioning

confidence: 99%

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Dhal

Dey

Прасад

2017

Bull. Chem. React. Eng. Catal.

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The different Ag and K substituted perovskite catalysts including base catalyst were LaMnO3 by the solid state method and the diesel soot was prepared in the laboratory. Their structures and physicochemical properties were characterized by X-ray diffraction (XRD), BET, SEM, H2-TPR, and XPS techniques. The Ag Substituted at A-site perovskite structured catalysts are more active than other type of catalysts for the simultaneous soot-NOx reaction, When Ag and K are simultaneously introduced into LaMnO3 catalyst, soot combustion is largely accelerated, with the temperature (Tm) for maximal soot conversion lowered by at least 50 °C, moreover, NOx reduction by soot is also facilitated. The high activity of La0.65Ag0.35MnO3 perovskite catalyst is attributed to presence of metallic silver in the catalyst. The activity order of Ag doped LaMnO3 is as follows La0.65Ag0.35MnO3 > La0.65Ag0.2MnO3 > La0.65Ag0.4MnO3 > La0.65Ag0.1MnO3. The dual substitution of silver and potassium in place of La in LaMnO3 gives better activity than only silver doped catalyst. In a series of La0.65AgxK1-xMnO3, the optimum substitution amount of K is for x=0.25. The single and doubled substituted perovskite catalyst proved to be effective in the simultaneous removal of NOx and soot particulate, the two prevalent pollutants in diesel exhaust gases in the temperature range 350-480 °C.

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“…In conclusion, Ag-based catalysts were proven as a promising alternative to Pt-based catalysts for the simultaneous removal of soot and NO x even if their NO x reduction performances should be further improved, being low the selectivity to nitrogen. Matarrese et al [115] investigated a second class of Pt-free catalysts based on ruthenium supported on different supports (Ce 0.8 Zr 0.2 O 2 , ZrO 2 , and Al 2 O 3 ) with Ba or K as NO x storage materials. According to TPO experiments, all the investigated systems were found more active in soot combustion than traditional Pt-based LNT materials.…”

Section: Pt-free Dpnr Systemsmentioning

confidence: 99%

“…Matarrese et al [ 115 ] investigated a second class of Pt-free catalysts based on ruthenium supported on different supports (Ce 0.8 Zr 0.2 O 2 , ZrO 2 , and Al 2 O 3 ) with Ba or K as NO x storage materials. According to TPO experiments, all the investigated systems were found more active in soot combustion than traditional Pt-based LNT materials.…”

Section: Pgm-based Catalysts For Simultaneous Removal Of Soot and mentioning

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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Simultaneous removal of soot and NO over K- and Ba-doped ruthenium supported catalysts

Cited by 23 publications

References 75 publications

Mesoporous manganese oxides for NO2 assisted catalytic soot oxidation

Mesoporous manganese oxides for NO2 assisted catalytic soot oxidation

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

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

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