Global Kinetics for Platinum Diesel Oxidation Catalysts

Sampara, Chaitanya S.; Bissett, Edward J.; Chmielewski, and Matthew; Assanis, Dennis N.

doi:10.1021/ie070642w

Cited by 44 publications

(42 citation statements)

References 12 publications

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“…In the untreated engine exhaust gas, the NO 2 component in the NO x is only about 10 % at most operating points. With the function of the DOC, NO 2 :NO rate is increased by inducing thermodynamic equilibrium Sampara et al 2007). …”

Section: Diesel Oxidation Catalyst (Doc)mentioning

confidence: 99%

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Reşi̇toğlu

Altınışık

Keskïn

2014

Clean Techn Environ Policy

816

353

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Diesel engines have high efficiency, durability, and reliability together with their low-operating cost. These important features make them the most preferred engines especially for heavy-duty vehicles. The interest in diesel engines has risen substantially day by day. In addition to the widespread use of these engines with many advantages, they play an important role in environmental pollution problems worldwide. Diesel engines are considered as one of the largest contributors to environmental pollution caused by exhaust emissions, and they are responsible for several health problems as well. Many policies have been imposed worldwide in recent years to reduce negative effects of diesel engine emissions on human health and environment. Many researches have been carried out on both diesel exhaust pollutant emissions and aftertreatment emission control technologies. In this paper, the emissions from diesel engines and their control systems are reviewed. The four main pollutant emissions from diesel engines (carbon monoxide-CO, hydrocarbons-HC, particulate matter-PM and nitrogen oxides-NO x ) and control systems for these emissions (diesel oxidation catalyst, diesel particulate filter and selective catalytic reduction) are discussed. Each type of emissions and control systems is comprehensively examined. At the same time, the legal restrictions on exhaust-gas emissions around the world and the effects of exhaust-gas emissions on human health and environment are explained in this study.

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Section: Diesel Oxidation Catalyst (Doc)mentioning

confidence: 99%

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Reşi̇toğlu

Altınışık

Keskïn

2014

Clean Techn Environ Policy

816

353

View full text Add to dashboard Cite

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“…The Voltz model has been used by many workers, and forms the basis for systems much more complex than the one used by Voltz. It has been extended to three‐way catalysis with extensive modifications, as well as diesel oxidation catalysts …”

Section: Global Modelling Using the Voltz Expressionsmentioning

confidence: 99%

“…It has been extended to three-way catalysis with extensive modifications, [15] as well as diesel oxidation catalysts. [16] MODELLING THE IGNITION CURVES…”

Section: Global Modelling Using the Voltz Expressionsmentioning

confidence: 99%

Investigating carbon monoxide and propene oxidation on a platinum diesel oxidation catalyst

Sola¹,

Abedi

Hayes³

et al. 2014

Can J Chem Eng

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This paper presents a detailed analysis of global kinetic models for the oxidation of carbon monoxide and propene, in the presence of water, hydrogen, carbon dioxide, excess oxygen and nitrogen. The context is the automotive catalytic converter for a lean burn engine. Experimental results are presented for a commercial platinum diesel oxidation catalyst used in the form of a 400 CPSI washcoated monolith. Models are developed based on the classical LHHW format presented by Voltz et al., Ind. Eng. Chem. Prod. Res. Dev. 1973;12:294. The models are developed stepwise for experiments for each reactant alone and the predictive ability of the results is examined. It is found that it is necessary to use experiments with both reactants present to develop a reliable model.

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“…GT-Power was also used to model the aftertreatment processes using the DOC model. The built-in DOC model in GT-Power developed by Bissett & Sampara [24] is used as a baseline model. The exhaust gas properties such as gas composition, exhaust flow rate and exhaust temperature from the engine system model and catalyst specifications given by the manufacturer are given as inputs to the DOC model.…”

Section: Gt-power and Cfd Model Descriptionmentioning

confidence: 99%

Use of Early Exhaust Valve Opening to Improve Combustion Efficiency and Catalyst Effectiveness in a Multi-Cylinder RCCI Engine System: A Simulation Study

Bharath

Kalva

Reitz

et al. 2014

Volume 1: Large Bore Engines; Fuels; Advanced Combustion; Emissions Control Systems

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Low Temperature Combustion (LTC) strategies such as Reactivity Controlled Compression Ignition (RCCI) can result in significant improvements of fuel economy and emissions reduction. However, they can produce significant carbon monoxide and unburnt hydrocarbon emissions at low load operating conditions due to poor combustion efficiencies at these operating points, which is a consequence of the low combustion temperatures that cause the oxidation rates of these species to slow down. The exhaust gas temperature is also not high enough at low loads for effective performance of turbocharger systems and diesel oxidation catalysts (DOC). The DOC is extremely sensitive to exhaust gas temperature changes and lights off only when a certain temperature is reached, depending on the catalyst specifications. Uncooled EGR can increase combustion temperatures, thereby improving combustion efficiency, but high EGR concentrations of 50% or more are required, thereby increasing pumping work and reducing volumetric efficiency. However, with early exhaust valve opening, the exhaust gas temperature can be much higher, allowing lower EGR flow rates, and enabling activation of the DOC for more effective oxidization of unburnt hydrocarbons and CO in the exhaust.In this paper, a multi-cylinder engine system simulation of RCCI at low load operation with early exhaust valve opening is presented, along with consideration of the exhaust aftertreatment system. The combustion process is modeled using the 3D CFD code, KIVA, and the heat release rates obtained from this combustion are used in a GT-Power model of a turbocharged, multi-cylinder light-duty RCCI engine for a full system simulation. The post-turbine exhaust gas is fed into GT-Power's aftertreatment model of the engine's DOC to determine the catalyst response. It is confirmed that opening the exhaust valve earlier increases the exhaust gas temperature, and hence lower EGR flow rates are needed to improve combustion efficiency. It was also found that exhaust temperatures of around 457 K are required to light off the catalyst and oxidize the unburnt hydrocarbons and CO effectively. Performance of the DOC was drastically improved and higher amounts of unburnt hydrocarbons were oxidized by increasing the exhaust gas temperature.

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Global Kinetics for Platinum Diesel Oxidation Catalysts

Cited by 44 publications

References 12 publications

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Investigating carbon monoxide and propene oxidation on a platinum diesel oxidation catalyst

Use of Early Exhaust Valve Opening to Improve Combustion Efficiency and Catalyst Effectiveness in a Multi-Cylinder RCCI Engine System: A Simulation Study

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