Study on the simultaneous reduction of diesel engine soot and NO with nano-CeO<sub>2</sub>catalysts

Huang, He; Liu, Junheng; Sun, Ping; Ye, Song

doi:10.1039/c6ra23125j

Cited by 15 publications

(7 citation statements)

References 34 publications

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“…The main contaminants emitted by this type of engine are NOx and soot particles. The NOx formation by the internal combustion due the high ignition temperature is well understood but the formation soot is more complicated and difficult to examine [4,5]. It is a big challenge to control these two pollutants with the fulfillment of exhausts emission regulation without affecting the fuel economy of diesel engines [6,7].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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 reactive oxygen species present can be characterized using the temperatures corresponding to the reduction peaks, and the amount of reactive oxygen species represents the catalytic ability of the catalyst in the oxidation of particulate matter. In our previous work, Ce 0.5 Mn 0.5 O 2 displayed relatively good reduction peak positions in the range of 100-500 °C, indicating high activity, which was a result of the conversion and electron transition between Mn 4+ /Mn 3+ and Ce 4+ /Ce 3+ ion pairs 32 . The peak positions of the H 2 -TPR profile varied with increasing K content (Fig.…”

Section: Resultsmentioning

confidence: 75%

Study on oxidation activity of Ce–Mn–K composite oxides on diesel soot

Huang¹,

Xiao²,

Liu³

et al. 2020

Sci Rep

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As an effective method, diesel particulate filter (DPF) technology has a great contribution in reducing soot emissions from diesel engines. To achieve passive regeneration of DPF at low temperatures, K-doped ce 0.5 Mn 0.5 o 2 catalysts were synthesized using sol-gel method. The effect of K-doped catalysts-K z-ce 0.5 Mn 0.5 o 2-on the oxidation of soot had been studied by thermogravimetric analysis, and the corresponding catalytic properties were evaluated based on X-ray diffraction (XRD), hydrogen temperature programmed reduction (H 2-TPR), O 2 temperature programmed desorption (O 2-TPD) Raman spectroscopy (Raman), Brunauer-Emmett-Teller (BET) and Fourier-Transform-Infrared (FTIR). The results showed that K doping facilitated the oxidation of diesel particulate matter, which was indicated by the entire mass loss curve shifting to lower temperatures. K 0.2-ce 0.5 Mn 0.5 o 2 showed the best performance among the series of K-doped catalysts. Compared with the findings for Ce 0.5 Mn 0.5 o 2 , the ignition temperature of soot oxidation (T i) had been lowered by 28 ℃, and the maximum peak combustion temperature (T m) of the dry soot decreased by 61 °C. Furthermore, compared with the ce 0.5 Mn 0.5 o 2-catalyzed reaction, K doping led to a lower activation energy and significantly improved pre-exponential factor. The minimum reaction activation energy of 27.46 kJ/mol was exhibited by K 0.2-ce 0.5 Mn 0.5 o 2. Diesel vehicles are currently attracting interest owing to their distinctive characteristics of superior power performance and fuel economic properties 1-3 while the pollutants contained in diesel exhaust gas, particularly soot, pose hazards to human's living environment and become one of the source of greenhouse gas which leads to global warming. Therefore, finding proper ways to cut down soot emissions from diesel engines become one of the researching hotpots in the study progress of diesel vehicles, that' why many researchers studied diesel particulate filters (DPF), an effective methods of lowering soot emissions by passive regeneration by chemical catalysis and improving the temperature of the diesel exhaust which is sufficient for soot to burn out. Hence, selecting a suitable catalyst is the key challenge for regeneration 4-8. It is well known that the utilization rate of rare earth resources is low, despite their abundance. CeO 2 plays an important role in three-way catalysts owing to its excellent oxygen storage and release properties 9. Generally, CeO 2 performs as an oxygen buffer to store excess oxygen quickly as the oxygen concentration in the exhaust gas is increasing to higher level, and releasing oxygen promptly at low oxygen concentrations 10-12. In addition, CeO 2 is a promising noble metal substitute for improving the anti-poisoning performance and high temperature durability of catalysts 13,14. The technology of Ce-based catalysts is still constantly improving after decades of development. The unique chemical and physical properties of rare earth-based catalysts present due to their electronic ener...

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“…These data are consistent with (although not identical to) the results obtained from catalytic activity simulations. 30,31…”

Section: Resultsmentioning

confidence: 99%

“…These data are consistent with (although not identical to) the results obtained from catalytic activity simulations. 30,31 Effect of Ce 1-x Mn x O 2 on CO emissions. CO is the primary intermediate product during the combustion of diesel fuel and is at least partly converted to CO 2 in the cylinder.…”

Section: Effect Of Ce 1-x Mn X O 2 On Diesel Engine Emissionsmentioning

confidence: 99%

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Study on the effect of Ce_1-xMn_xO₂ catalyst on improving diesel emission performance

Huang

Zhang

Liu

et al. 2020

Advances in Mechanical Engineering

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To reduce diesel emissions while permitting the passive regeneration of the diesel particulate filter (DPF) at low temperatures, we developed three after-treatment DPF devices. These devices consisted of a ceramic body that was either bare or loaded with the catalysts CeO2 (DPF-CeO2) or Ce0.5Mn0.5O2 (DPF-Ce0.5Mn0.5O2). The effects of these units on soot, NOx, CO, and hydrocarbon emissions were assessed. On average, the DPF-Ce0.5Mn0.5O2 device outperformed the DPF-CeO2 device. In addition, increasing the engine load was found to raise the exhaust temperature while increasing the soot oxidation efficiency and reducing soot emissions. The maximum soot removal percentages of the DPF-CeO2 and DPF-Ce0.5Mn0.5O2 were 37.6% and 55.1%, respectively, under B100 working conditions. The extent of NOx removal also gradually increased as the load increased, and the average removal percentages were 8.6% and 15.0%, respectively. Both catalytic devices lowered CO emissions to a much greater extent than the bare DPF, with average removals of 45.8% and 55.6%, respectively, while the average hydrocarbon oxidation values were 39.1% and 50.9%, respectively. Notably, the hydrocarbon emissions were almost zero after Ce1-xMnxO2 catalysis under C100 working conditions.

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Study on the simultaneous reduction of diesel engine soot and NO with nano-CeO₂catalysts

Abstract: Nano-CeO2 catalysts simultaneously reduce diesel soot and nitric oxide on a catalytic activity evaluation platform.

Cited by 15 publications

References 34 publications

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

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

Study on oxidation activity of Ce–Mn–K composite oxides on diesel soot

Study on the effect of Ce_1-xMn_xO₂ catalyst on improving diesel emission performance

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Study on the simultaneous reduction of diesel engine soot and NO with nano-CeO2catalysts

Abstract: Nano-CeO2 catalysts simultaneously reduce diesel soot and nitric oxide on a catalytic activity evaluation platform.

Cited by 15 publications

References 34 publications

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

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

Study on oxidation activity of Ce–Mn–K composite oxides on diesel soot

Study on the effect of Ce1-xMnxO2 catalyst on improving diesel emission performance

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Study on the simultaneous reduction of diesel engine soot and NO with nano-CeO₂catalysts

Study on the effect of Ce_1-xMn_xO₂ catalyst on improving diesel emission performance