Impact of Oxidation Catalysts on Exhaust NO<sub>2</sub>/NO<sub>x</sub> Ratio from Lean-Burn Natural Gas Engines

Olsen, Daniel B.; Kohls, Morgan; Arney, Gregg

doi:10.3155/1047-3289.60.7.867

Cited by 33 publications

(17 citation statements)

References 8 publications

(9 reference statements)

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“…Nowadays, due to this substantial increase of the NO 2 emissions [14], the interest for this phenomenon is high and multiple studies have been developed focusing on exhaust-out [15][16][17][18][19][20][21][22][23] and engine-out emissions [24][25][26][27][28][29][30][31][32]. Concerning this latter group the main influence comes from the fuel's characteristics (i.e: blends and/or composition) and the influence of the combustion process.…”

Section: Diesel Passenger Carsmentioning

confidence: 99%

Comprehensive modeling study analyzing the insights of the NO–NO2 conversion process in current diesel engines

Benajes

López

Novella

et al. 2014

Energy Conversion and Management

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Multiple researches have focused on reducing the NO x emissions and the greatest results have been achieved when lowering the combustion temperature by employing massive exhaust gas recirculation rates (LTC). Despite this benefit, a substantial increase in the NO 2 contribution to the NO x emissions has also been observed, which is the most harmful specie and is important for the design and positioning of the after-treatment devices. To understand how NO 2 behaves and how it contributes to the total NOx (NO 2 /NO x), not only under LTC but also for CDC conditions, a stepwise computational research study was performed with Chemkin Pro software, due to the complexity of isolating the different phenomena studied, to analyze: 1) general equilibrium conditions and 2) the influence of typical diesel engine phenomena (combustion and cooling effects) under non-equilibrium conditions.

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Section: Diesel Passenger Carsmentioning

confidence: 99%

Comprehensive modeling study analyzing the insights of the NO–NO2 conversion process in current diesel engines

Benajes

López

Novella

et al. 2014

Energy Conversion and Management

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“…The combustion processes mainly produce NO, while NO 2 is formed by the oxidation of nitric oxide in atmospheric air. The NO 2 concentration in the exhaust gas achieves much lower concentrations compared to NO [32,33]. Increasing the share of CNG co-combusted with diesel fuel causes an increase in nitric oxide emissions.…”

Section: Exhaust Emissionsmentioning

confidence: 99%

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

2019

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One of the possibilities to reduce diesel fuel consumption and at the same time reduce the emission of diesel engines, is the use of alternative gaseous fuels, so far most commonly used to power spark ignition engines. The presented work concerns experimental research of a dual-fuel compression-ignition (CI) engine in which diesel fuel was co-combusted with CNG (compressed natural gas). The energy share of CNG gas was varied from 0% to 95%. The study showed that increasing the share of CNG co-combusted with diesel in the CI engine increases the ignition delay of the combustible mixture and shortens the overall duration of combustion. For CNG gas shares from 0% to 45%, due to the intensification of the combustion process, it causes an increase in the maximum pressure in the cylinder, an increase in the rate of heat release and an increase in pressure rise rate. The most stable operation, similar to a conventional engine, was characterized by a diesel co-combustion engine with 30% and 45% shares of CNG gas. Increasing the CNG share from 0% to 90% increases the nitric oxide emissions of a dual-fuel engine. Compared to diesel fuel supply, co-combustion of this fuel with 30% and 45% CNG energy shares contributes to the reduction of hydrocarbon (HC) emissions, which increases after exceeding these values. Increasing the share of CNG gas co-combusted with diesel fuel, compared to the combustion of diesel fuel, reduces carbon dioxide emissions, and almost completely reduces carbon monoxide in the exhaust gas of a dual-fuel engine.

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“…The most important emissions from combustion of fossil fuel are nitrogen oxides (NO x ), sulfur oxides (SO x ), carbon monoxide (CO), volatile organic compounds (VOC) and particulate matter which discharged into the atmosphere through the exhaust of cars, factories and power plants [2,3]. Generated NO x in the combustion process generally refers to a mixture of NO and NO 2 [4][5][6][7]. Emissions of nitrogen oxides are great concern for human life and environment because of acid rain and photochemical smog formation, global warming due to the greenhouse gas effects, and the depletion of the stratospheric ozone layer [5,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Modeling Study of CO-Selective Catalytic Reduction of NO Over Perovskite-Type Nanocatalysts

Abedi

Niaei

Namjou

et al. 2019

Period. Polytech. Chem. Eng.

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In this work LaFeO3, LaFe0.7Mn0.3O3 and LaMn0.7Fe0.3O3 nanocatalysts with perovskite structures have been synthesized by sol-gel method. The selective catalytic reduction of NO with CO (CO-SCR) using synthesized nanocatalysts was investigated in a plug flow reactor. The kinetics of CO-SCR process was studied and three kinetic models were used to describe the behavior of the system, including power low model (PLM), kinetic model 1 (KM1) and kinetic model 2 (KM2). The KM1 was the best model with correlation coefficients of 0.9924, 0.9911 and 0.9902 and the sum of squared errors of 0.0504, 0.0488 and 0.0397, for LaFeO3, LaFe0.7Mn0.3O3 and LaFe0.3Mn0.7O3 catalysts, respectively. By comparing experimental results with the predicted results of the KM1, it was found that the proposed model can predict the performance of catalysts in the CO-SCR process with considerable precision. The structure and morphology of perovskite-type oxides were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively.

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Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines

Cited by 33 publications

References 8 publications

Comprehensive modeling study analyzing the insights of the NO–NO2 conversion process in current diesel engines

Comprehensive modeling study analyzing the insights of the NO–NO2 conversion process in current diesel engines

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

Experimental and Modeling Study of CO-Selective Catalytic Reduction of NO Over Perovskite-Type Nanocatalysts

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Impact of Oxidation Catalysts on Exhaust NO2/NOx Ratio from Lean-Burn Natural Gas Engines

Cited by 33 publications

References 8 publications

Comprehensive modeling study analyzing the insights of the NO–NO2 conversion process in current diesel engines

Comprehensive modeling study analyzing the insights of the NO–NO2 conversion process in current diesel engines

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

Experimental and Modeling Study of CO-Selective Catalytic Reduction of NO Over Perovskite-Type Nanocatalysts

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Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines