Performance Evaluations of Aluminum Titanate Diesel Particulate Filters

Ingram-Ogunwumi, Roychelle; Dong, Quan; Murrin, T. A.; Bhargava, Rajesh; Warkins, Jason; Heibel, Achim

doi:10.4271/2007-01-0656

Cited by 22 publications

(15 citation statements)

References 9 publications

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“…Of course, thermochemical degradation is a kinetic process and will depend on times at temperature. Data obtained by Corning indicate that the total time a DPF spends at temperatures in excess of 900°C is about 30 min over the warranted DPF life, 48 times less time than that investigated herein. Ten minutes would be the apparent maximum duration at 1000°C (three times the time investigated herein) and excursions to higher temperatures have not been recorded in the working systems examined.…”

Section: Discussionmentioning

confidence: 99%

Degradation Resistance of Cordierite Diesel Particulate Filters to Diesel Fuel Ash Deposits

et al. 2011

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The thermochemical degradation resistance of a typical cordierite diesel particulate filter (DPF) material by synthetic ashes typical of those arising in practice has been investigated over the temperature range 950°C–1250°C. Differential thermal analyses and heat treatment of pressed pellets were used to characterize the melting/transformation behavior of ashes representative of typical diesel fuel (ash A) and those typical of when the catalysts ferrocene (ash FeA) and cerium carboxylate (ash CeA) were present in the fuel and to study the interaction chemistry between powdered cordierite and the ash compositions. Additional experiments involved the application of surface coverings of ash to DPF specimens. The results obtained showed that filter performance would not be compromised by ash liquefaction/sintering as long as temperatures did not exceed 900°C for ash A, 970°C for ash FeA and 1100°C for ash CeA. For long time periods, compared to the expected application durations, liquid phosphates dissolve cordierite leading to the formation of Zn and Fe aluminate spinels. Overall, the results clearly indicate that thermochemical degradation of cordierite by ashes under conditions representative of typical diesel engine systems is highly unlikely at temperatures of 1100°C and below.

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Section: Discussionmentioning

confidence: 99%

Degradation Resistance of Cordierite Diesel Particulate Filters to Diesel Fuel Ash Deposits

et al. 2011

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“…Since it is the thermal stress applied rather than the soot load itself [10] the operating window is typically represented by using relevant stressors such as, for example, the maximum temperature and the maximum temperature gradient inside the filter. This has been discussed for the current commercial aluminum titanate product in detail elsewhere [12]. Although some of the filters discussed in reference [12] failed at higher temperatures and gradients a guidance of a maximum temperature of 1200°C and a maximum temperature gradient of 600°C/cm has been provided.…”

Section: Survivability and Soot Mass Limit Under Worst Case Regeneratmentioning

confidence: 99%

“…This has been discussed for the current commercial aluminum titanate product in detail elsewhere [12]. Although some of the filters discussed in reference [12] failed at higher temperatures and gradients a guidance of a maximum temperature of 1200°C and a maximum temperature gradient of 600°C/cm has been provided. Note that these numbers require temperature measurement according to the detailed procedures described in reference [12] since, for example, the temperature gradient is extremely sensitive to the placement of the thermocouples.…”

Section: Survivability and Soot Mass Limit Under Worst Case Regeneratmentioning

confidence: 99%

“…The filters tested and shown were also of different size and cover 300/13 as well as 300/10 cell geometry, with the latter representing the majority of the data. The maximum radial gradient measured inside the filter vs. the maximum temperature (thermocouple placement as specified in [12]) is shown. The blue and red symbols indicate how far the PN emissions measured after the drop to idle regeneration have been below or above the limit of 6×10 11 #/km, respectively.…”

Section: Fig 8 Example Of the Transient Conditions And Temperaturesmentioning

confidence: 99%

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Next Generation Aluminum Titanate Filter for Light Duty Diesel Applications

Boger

Jamison

Warkins

et al. 2011

SAE Technical Paper Series

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With the introduction of the current EU5 standards the diesel particulate filter has become a key element in the aftertreatment of diesel passenger cars. The upcoming future emission standards target primarily a further reduction in NOx emission as well as reduced fleet average CO 2 emissions. Although the particulate filter has no direct influence on the reduction of these species, the needs of future aftertreatment systems impose additional requirements on advanced filter technologies. In this paper we are introducing two new filter products based on a new low porosity aluminum titanate family that complement the current DuraTrap ® AT filter products. The new products offer the potential for an increased soot mass limit or a significant reduction in pressure drop. The enhanced performance of the new filter products is discussed and demonstrated in a large number of experimental data obtained in engine bench tests. Pressure drop, filtration, survivability, and durability data are presented.

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“…Both radial gradients and thermal exposure parameter versus maximum bed temperature are shown in Figure 15. Similar to thermal exposure parameter, radial gradient is also an indicator of thermal stress [5]. Data points with a mark indicate when first crack in the filter was detected.…”

Section: Survivabilitymentioning

confidence: 99%

A Next Generation Cordierite Diesel Particle Filter with Significantly Reduced Pressure Drop

Boger¹,

He²,

Collins³

et al. 2011

SAE Int. J. Engines

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Diesel particle filters (DPF) have become a standard after treatment component for all current and future on-road diesel engines used in the US. In Europe the introduction of EUVI is expected to also result in the broad implementation of DPF's. The anticipated general trend in engine technology towards higher engine out NOx/PM ratios results in a somewhat changing set of boundary conditions for the DPF predominantly enabling passive regeneration of the DPF. This enables the design of a novel filter concept optimized for low pressure drop, low thermal mass for optimized regeneration and fast heat-up of a downstream SCR system, therefore reducing CO 2 implications for the DPF operation. In this paper we will discuss results from a next generation cordierite DPF designed to address these future needs. The new materials are based on a thinwall design with optimized material and microstructure, resulting in an almost linear pressure drop response with soot loading in the bare and catalyzed state. A significant reduction in soot loaded pressure drop for uncoated and coated filters is demonstrated of the new filter design vs. current EPA 2010 filter technologies. The optimized microstructure also enables high filtration efficiency for mass and number. Results from a wide range of regeneration experiments will be used to discuss the thermal operating window of the new material and the thermal response during normal operation and active regeneration. A uniform temperature distribution and the fast thermal response of the low mass filter minimize implications on fuel consumption.

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Performance Evaluations of Aluminum Titanate Diesel Particulate Filters

Cited by 22 publications

References 9 publications

Degradation Resistance of Cordierite Diesel Particulate Filters to Diesel Fuel Ash Deposits

Degradation Resistance of Cordierite Diesel Particulate Filters to Diesel Fuel Ash Deposits

Next Generation Aluminum Titanate Filter for Light Duty Diesel Applications

A Next Generation Cordierite Diesel Particle Filter with Significantly Reduced Pressure Drop

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