A simplified model for natural-gas vehicle catalysts with honeycomb and foam substrates

Tsinoglou, Dimitrios N.; Eggenschwiler, Panayotis Dimopoulos; Thurnheer, T.; Höfer, Peter

doi:10.1243/09544070jauto1095

Cited by 17 publications

(9 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a previous study [14] we have demonstrated, using numerical simulation, that the foams are characterized by much higher mass transfer ratios from the bulk flow to the catalyst surface in respect to honeycombs. We have though pointed out that this advantage may be partly but also even completely offset by the lower available surface area for the chemical reactions.…”

Section: Figure 11 Co Oxidation Efficiency (Honeycomb Vs Foam) Figumentioning

confidence: 96%

“…Following a systematic development process, our laboratory has extensively investigated material issues, [11], the fluid dynamic behavior, [12,13], reactivity in the exhaust gas of natural gas engines [4,5], while using simulation for analyzing the underlying phenomena, [14]. In this study the focus was the realization of a foam based DOC for a small heavy duty truck.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ceramic Foam Catalyst Substrates for Diesel Oxidation Catalysts: Pollutant Conversion and Operational Issues

Bach¹,

Eggenschwiler²

2011

SAE Technical Paper Series

View full text Add to dashboard Cite

In the field of automotive exhaust catalysts, foam-type substrates have been proposed as alternatives to the wellestablished honeycomb substrates. The ceramic foams developed and manufactured in our laboratory are capable of redistributing the flow of exhaust gases, enhancing turbulence, mass transfer and species mixing, without increasing flow resistance and pressure drop to prohibitive levels. Based on the characteristics of turbulent mass and heat transfer, ceramic foam based catalysts have the potential for achieving similar pollutant conversion performances as state of art honeycomb catalysts with substantially lower precious metal requirements. The conversion performances achieved with the foam catalyst were almost equal to those achieved by the honeycomb in respect to CO and THC oxidation, although honeycombs had 2.8 times more precious metals. In addition, the foams exhibited substantially better particle oxidizing behavior, as particle number measurements have shown. Nevertheless, NO oxidation light-off performance of the foams was worse. This may be attributed to different wash coat compositions, the wash coat composition of the serial production honeycomb was not fully known. The comparison of two differently coated foam DOCs have given insights in the conversion dependencies on the coating parameters and have shown further optimization directions.

show abstract

Section: Figure 11 Co Oxidation Efficiency (Honeycomb Vs Foam) Figumentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Ceramic Foam Catalyst Substrates for Diesel Oxidation Catalysts: Pollutant Conversion and Operational Issues

Bach¹,

Eggenschwiler²

2011

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…Tsinoglou et al [17] has developed a mathematical model to study and compare the transport phenomenon between wash-coated honeycomb and ceramic foam substrates. They reported that a faster mass transfer rate in the gas phase and a slower diffusion rate through the pores of the wash coat (compared to the rates achieved using honeycomb substrates) could be achieved using ceramic foam.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental investigation on the emission reduction potential of metal oxide-coated ceramic foam filters as substrates for diesel engines

Premnath¹,

Murugan²

2021

IJATEE

View full text Add to dashboard Cite

In the field of road transportation, the majority of the vehicles are powered either by diesel or gasoline engines. These engines are fuelled using fossil fuel, resulting in carbon monoxide, unburned hydrocarbon, nitrogen oxides, and soot emission. The emissions from these engine-powered vehicles are one of the major contributors to environmental pollution [1]. The emission from road transport vehicles accounts for two-thirds of the total emissions recorded from the transportation sector [2]. *Author for correspondence Diesel-based engines are widely used in buses, heavy trucks, commercial light-duty vehicles, and passenger cars as they exhibit higher torque, load-carrying capacity, thermal efficiency, and low maintenance cost compared to gasoline-based engines [3].On the other hand, diesel-powered vehicles emit higher amounts of toxic gases compared to gasolinepowered vehicles [4]. The extent of air pollution caused by the emissions from these vehicles is continuously increasing as the demand for vehicles is increasing with time to meet the requirements of the ever-growing population [5].The emissions adversely affect the environment, resulting in climatic changes. Human health is also adversely affected by toxic emissions [6]. To control the pollution caused by vehicles, pollution control authorities lay out emission norms (revised once every

show abstract

“…Chemical reactions have also been modelled based on simplified Arrhenius and Langmuir-Hinshelwood approaches. The associated parameters have been chosen by tuning experimental data starting from literature data taken from [10,11,12]. Up to now, CO oxidation has been taken into account under oxygen abundance, i.e., typical Diesel Oxidation Catalyst conditions.…”

Section: Simulation Modelmentioning

confidence: 99%

Heat Transfer Analysis of Catalytic Converters during Cold Starts

Papetti¹,

Eggenschwiler²,

Torre³

et al. 2019

SAE Technical Paper Series

View full text Add to dashboard Cite

T he transient heat transfer behavior of an automotive catalytic converter has been simulated with OpenFOAM in 1D. The model takes into consideration the gas-solid convective heat transfer, axial wall conduction and heat capacity effects in the solid phase, but also the chemical reactions of CO oxidation, based on simplified Arrhenius and Langmuir-Hinshelwood approaches. The associated parameters are the results of data in literature tuned by experiments. Simplified cases of constant flow rates and gas temperatures in the catalyst inflow have been chosen for a comprehensive analysis of the heat and mass transfer phenomena. The impact of inlet flow temperatures and inlet flow rates on the heat up characteristics as well as in the CO emissions have been quantified. A dimensional analysis is proposed and dimensionless temperature difference and space-time coordinates are introduced. Using this suitably modified coordinates, for the case of negligible axial solid conduction, computed solid temperature at the reactor outlet lay on a typical S-curve, allowing the introduction of an analytical function. A series of variations in the inlet exhaust temperature and mass flow as well as the initial solid temperature was chosen in order to highlight relevant dependencies. Results show the performance of the catalyst during cold start and have been used for a preliminary energetic assessment of the effectiveness of preheating the catalyst, the exhaust gas or both.

show abstract

A simplified model for natural-gas vehicle catalysts with honeycomb and foam substrates

Cited by 17 publications

References 30 publications

Ceramic Foam Catalyst Substrates for Diesel Oxidation Catalysts: Pollutant Conversion and Operational Issues

Ceramic Foam Catalyst Substrates for Diesel Oxidation Catalysts: Pollutant Conversion and Operational Issues

Experimental investigation on the emission reduction potential of metal oxide-coated ceramic foam filters as substrates for diesel engines

Heat Transfer Analysis of Catalytic Converters during Cold Starts

Contact Info

Product

Resources

About