Conversion Efficiency of a 2-Way Catalyst Fitted in a Used Vehicle without Feedback Emission Control System

Hassaneen, Ahmed; Lotfy, Ibrahim

doi:10.4271/2005-01-2164

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The light-off temperature is a key feature of TWC performance during coldstart, and it has been shown that the time taken to reach light-off temperature is strongly dependent on the rate of temperature increase [10]. The light-off temperature for CO conversion is ~220 o C, and the light-off temperature for HC conversion is ~260 o C [17].…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Three-Way Catalytic Converter on Particulate Matter from a Gasoline Direct-Injection Engine During Cold-Start

Whelan¹,

Timoney²,

Smith³

et al. 2013

SAE Int. J. Engines

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The effect of a three-way catalytic converter on particulate matter from a gasoline direct-injection engine during cold-start. AbstractThis work investigates the effect of a three-way catalytic converter and sampling dilution ratio on nano-scale exhaust particulate matter emissions from a gasoline direct-injection engine during cold-start and warm-up transients. Experimental results are presented from a four cylinder in-line, four stroke, wall-guided direct-injection, turbo-charged and inter-cooled 1.6 l gasoline engine. A fast-response particulate spectrometer for exhaust nano-particle measurement up to 1000 nm was utilised. It was observed that the three-way catalytic converter had a significant effect on particle number density, reducing the total particle number by up to 65 % over the duration of the cold-start test. The greatest change in particle number density occurred for particles less than 23 nm diameter, with reductions of up to 95 % being observed, whilst the number density for particles above 50 nm diameter exhibited a significant increase. The exhaust temperature plays a significant role on the influence of the catalytic converter on the nano-scale particulate matter. It is evident that the dilution ratio of the exhaust sample has a distinct effect on the particulate matter number and size distribution, influencing the engine-out PM more significantly than the tailpipe-out PM during cold-start engine operation. The catalytic converter also has a considerable effect on the estimated total particle mass.

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Section: Introductionmentioning

confidence: 99%

The Effect of a Three-Way Catalytic Converter on Particulate Matter from a Gasoline Direct-Injection Engine During Cold-Start

Whelan¹,

Timoney²,

Smith³

et al. 2013

SAE Int. J. Engines

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“…Hassaneen [18] presented similar results and also showed that it takes about 8-10 min for the catalyst to respond for a coldstarting engine. The light-off temperature of diesel oxidation catalyst is usually around 200 uC [17][18][19]. When the engine is at idle under no-load and lowspeed operations, the exhaust temperature hardly crosses 100 uC and the use of oxidation catalysts is no longer effective.…”

Section: Introductionmentioning

confidence: 64%

“…This type of reduction is higher for new or preconditioned catalyst than for aged or nonpreconditioned catalyst [1]. Hassaneen [18] presented similar results and also showed that it takes about 8-10 min for the catalyst to respond for a coldstarting engine. The light-off temperature of diesel oxidation catalyst is usually around 200 uC [17][18][19].…”

Section: Introductionmentioning

confidence: 94%

“…The short life of catalytic converters in diesel engines was a problem until a few years ago. This problem has been overcome now, and there are reports which show long service life of catalytic converters and remarkable reductions in total hydrocarbons (THCs), PM, and CO with converters [14][15][16][17][18][19]. However, the benefits are somewhat dependent upon engine loads and exhaust temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of an oxidation catalyst and a three-way catalyst on odorous emissions in internal combustion engines

Roy

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study investigated the effect of an oxidation catalyst on odorous emissions in a direct-injection diesel engine at idling. In cold or low-temperature idling, where engines are started from cold condition at ambient temperatures, the effectiveness of the oxidation catalyst to reduce total hydrocarbons (THCs) and aldehydes is low owing to the low catalyst temperatures, and the odour reduction is insignificant. In hot or high-temperature idling, where exhaust temperatures exceed 200 uC, THCs and aldehydes are reduced by more than 90 per cent and the odour reduction is more than one point, a significant odour reduction. Below a catalyst temperature of 200 uC, objectionable exhaust odour appears.The gasoline engine also emits a strong exhaust odour when the catalyst condition is poor or there is a mismatch of air-fuel ratio. The effect of a three-way catalyst on the exhaust odour was investigated in a gasoline engine. In rich engine operation condition, there are more THCs, carbon monoxide (CO), and nitrogen oxides (NO x ) before the catalyst. After the catalyst in this condition, the THCs, CO, and NO x are significantly reduced, but there is a very sharp and unpleasant odour of ammonia, which is produced inside the catalyst owing to the reduction of NO x .

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“…That caused significant reductions in HC, PM, and CO with oxidation catalysts [5,8]. The light-off temperature of diesel oxidation catalyst is usually around 200°C [6][7][8]. The light-off temperature of diesel oxidation catalyst is usually around 200°C [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on exhaust gas after treatment using limestone

Sakhrieh¹

2013

THERM SCI

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In this study a simple low-cost exhaust gas after-treatment filter using limestone was developed and tested on a four cylinder DI diesel engine coupled with dynamometer under variable engine running conditions. Limestone was placed in cast iron housing through which exhaust gases passes. The concentration of both carbon dioxide and nitrogen oxides were measured with and without the filter in place. It was found that both pollutants were decreased significantly when the filter is in place, with no increase in the fuel consumption rate

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Conversion Efficiency of a 2-Way Catalyst Fitted in a Used Vehicle without Feedback Emission Control System

Cited by 7 publications

References 12 publications

The Effect of a Three-Way Catalytic Converter on Particulate Matter from a Gasoline Direct-Injection Engine During Cold-Start

The Effect of a Three-Way Catalytic Converter on Particulate Matter from a Gasoline Direct-Injection Engine During Cold-Start

Effect of an oxidation catalyst and a three-way catalyst on odorous emissions in internal combustion engines

Experimental study on exhaust gas after treatment using limestone

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