Preparation and application of effective different catalysts for simultaneous control of diesel soot and NO<sub>X</sub>emissions: An overview

Dhal, Ganesh Chandra; Mohan, Devendra; Прасад, Рам

doi:10.1039/c6cy02612e

Cited by 57 publications

(26 citation statements)

References 108 publications

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“…These materials can exhibit different physical and chemical properties depending on the nature of M 2+ and/or M 3+ , on their molar ratios and on the interlayer anions. For these reasons, they are usually applied in catalysis [9], mainly for catalytic oxidation applications [10]. Since fresh hydrotalcites have high water content, which often makes them inactive for certain reactions, they are activated by thermal decomposition.…”

Section: Hydrotalcites and Mixed Metal Oxides Catalystsmentioning

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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Section: Hydrotalcites and Mixed Metal Oxides Catalystsmentioning

confidence: 99%

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

Castoldi

2020

Materials

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“…However, the average rate of increase of the N 2 O levels in the atmosphere is still approximately 0.2~0.3% annually, which is mainly caused by human activity, such as adipic and nitric acid plants as well as fuel combustion processes, especially after the 1980s [3][4][5]. Therefore, more research has not only paid much attention to the study of the effects of N 2 O on the environment and human body, but also has focused on the effective control of N 2 O emissions from stationary and mobile processes [6][7][8][9]. Several technologies have been potentially developed for N 2 O abatement, including thermal decomposition (TDeN 2 O) [10], nonselective catalytic reduction (NCR) [11], selective catalytic reduction (SCR) [12,13], and direct catalytic decomposition (DeN 2 O) [14].…”

Section: Introductionmentioning

confidence: 99%

N2O Abatement over Ruthenium Supported on Highly Dispersed Hydrotalcite-Like Composite Metal Oxides

Zhang¹,

Guo²,

Li³

et al. 2019

Pol. J. Environ. Stud.

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Highly dispersive hydrotalcite-like composite metal oxides were prepared by coprecipitation method. CO 2-TPD characterization showed that the adsorption capacity over the samples at low (<300ºC) and middle (300~550ºC) temperatures was improved by using La or Cu to modify the sample of MgAlO, while slightly reduced at high temperature (>550ºC). The experimental results showed that the composite metal oxide, Me x O y (Me=La, Mg, Al), had relatively good performance on N 2 O decomposition. A series of Ru/Me x O y catalysts were prepared by programed impregnation method. CO 2-TPD analysis indicated that the samples of Ru/Me x O y not only increased the total CO 2 adsorption capacity, but also obviously enhanced CO 2 adsorption capacity at 300~550ºC compared with Me x O y. TEM characterization showed that the Ru component was uniformly loaded on the support surface under nanoscale. N 2 O catalytic decomposition showed that the suitable Ru loading on support was 2.0(wt.)%, i.e., Ru(2.0)/Me x O y. Under conditions of (v/v) 10% N 2 O+82% N 2 +5.0% O 2 +3.0% H 2 O, 30000h-1 of space velocity, 510ºC, the stability test showed that N 2 O conversion remained ca. 95.0%, indicating that Ru(2.0)/Me x O y had good stability and activity at relatively low temperature.

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“…However, the rate of N 2 O increase in the atmosphere is still approximately 0.3% annually, and this imbalance between its production and deposition is mainly caused by human activity, for example, in adipic or nitric acid plants and through fuel combustion processes . Therefore, many efforts have focused on the effective control of N 2 O emissions from stationary and mobile processes, including the use of methods such as thermal decomposition (TDeN 2 O), nonselective catalytic reduction (NCR), selective catalytic reduction (SCR), and direct catalytic decomposition (DeN 2 O) . In addition, the use of N 2 O as an oxidant to catalyze benzene to phenol (OBPh) is also very interesting .…”

Section: Introductionmentioning

confidence: 99%

Catalytic N₂O decomposition over CeMeO_y/γ‐Al₂O₃ (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

Zhang

Guo

et al. 2018

Asia-Pacific J Chem Eng

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A series of CeMeOy/γ‐Al2O3 (Me = Mn, Cu, Zn) samples for effective catalytic N2O decomposition were prepared by impregnation method with large specific surface area support. The H2‐TPR and O2/CO2‐TPD results showed that the addition of CeO2 to samples of MeOx/γ‐Al2O3 was beneficial for the reduction of catalytic components, the desorption of surface oxygen, and the total amount of basic sites on the sample surface. The characterization of TPR, TPD, and XRD, and so forth indicated that synergistic action among catalytic components on the support was probably the origin of good activity towards N2O decomposition over Ce(1.2)MeOy/γ‐Al2O3 catalyst. The test that lasted for 200 hr showed that the sample of Ce(1.2)MeOy/γ‐Al2O3 prepared by impregnation method had good stability on N2O decomposition in a mixture containing certain amounts of O2 and H2O under applied experimental conditions. The characterization results of SEM and EDX over samples before and after stability indicated that the prepared Ce(1.2)MeOy/γ‐Al2O3 catalyst had good stable structure, which would provide the basis for further study, such as pilot‐scale investigation, in this field.

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Preparation and application of effective different catalysts for simultaneous control of diesel soot and NO_Xemissions: An overview

Abstract: Soot particulates and nitrogen oxides (NOX) from diesel engine exhaust have been causing serious problems to human health and the global environment.

Cited by 57 publications

References 108 publications

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

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

N2O Abatement over Ruthenium Supported on Highly Dispersed Hydrotalcite-Like Composite Metal Oxides

Catalytic N₂O decomposition over CeMeO_y/γ‐Al₂O₃ (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

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Preparation and application of effective different catalysts for simultaneous control of diesel soot and NOXemissions: An overview

Abstract: Soot particulates and nitrogen oxides (NOX) from diesel engine exhaust have been causing serious problems to human health and the global environment.

Cited by 57 publications

References 108 publications

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

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

N2O Abatement over Ruthenium Supported on Highly Dispersed Hydrotalcite-Like Composite Metal Oxides

Catalytic N2O decomposition over CeMeOy/γ‐Al2O3 (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

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Preparation and application of effective different catalysts for simultaneous control of diesel soot and NO_Xemissions: An overview

Catalytic N₂O decomposition over CeMeO_y/γ‐Al₂O₃ (Me = Mn, Cu, Zn) catalysts prepared by impregnation method