Control Technology for a Passenger Car Diesel Engine equipped with the DPNR system

Ohki, Hisashi; Ishiyama, Shinobu; Asano, A.

doi:10.4271/2003-01-1880

Cited by 10 publications

(3 citation statements)

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“…Toyota was the first car manufacturer company to use FWC system in the vehicle in 2003 using a diesel particulate-NO x reduction (DPNR) catalytic converter, subjected to \ 10 ppm sulphur in the diesel [21]. The DPNR is a porous ceramic filter coated with NSR catalyst constituting a noble metal (Pt) supported on c-Al 2 O 3 and an alkaline (K) or alkaline-earth metal (Ba) oxide.…”

Section: Introductionmentioning

confidence: 99%

A four-way catalytic system for control of emissions from diesel engine

Trivedi

Прасад

2018

Sādhanā

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The pollution caused by diesel-fuelled vehicles has become a subject of global concern. Presently, various separate technologies such as diesel oxidation catalyst, diesel particulate filter, selective catalytic reduction and ammonia selective catalytic reduction are used to control these pollutants. The four-way catalytic (FWC) system integrates all the separate control systems into a single compact unit. FWC technique using a combination of oxidation-reduction catalysts under various strategies has been investigated to simultaneously remove CO, HC, PM and NOx emitted from diesel engines. An oxidation catalyst (La 0.6 K 0.4 CoO 3) was prepared by two different methods (sol-gel and co-precipitation). The reduction catalysts: Ag/Al 2 O 3 and Cu-ZSM5 were synthesized by impregnation and ion-exchange method, respectively. The FWC was characterized by N 2sorption, X-ray diffraction, Fourier transform spectroscopy and scanning electron microscopy. The catalytic activities of FWC containing double-layer of catalysts were evaluated in a fixed-bed-tubular-reactor. The highest catalytic activity resulted by the two-layered system of La 0.6 K 0.4 CoO 3 (sol-gel) ? Cu-ZSM5 showing 100% NO conversion to N 2 at 415°C, maximum-temperature of soot-combustion at 410°C, complete C 3 H 8 conversion at 450°C and 100% CO conversion at 388°C. Maximum NO conversion was maintained up to 427°C; conversion started decreasing with further increase in temperature and 75.4% conversion remained up to 450°C. The performance of double-layered-catalytic-system was as follows: La 0.6 K 0.4 CoO 3 (sol-gel) ? Cu-ZSM5 [ La 0.6-K 0.4 CoO 3 (sol-gel) ? Ag/Al 2 O 3 [ La 0.6 K 0.4 CoO 3 (co-ppt) ? Ag/Al 2 O 3 [ La 0.6 K 0.4 CoO 3 (co-ppt) ? Cu-ZSM5.

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Section: Introductionmentioning

confidence: 99%

A four-way catalytic system for control of emissions from diesel engine

Trivedi

Прасад

2018

Sādhanā

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“…A treatment system for diesel engines that combined these two after-treatment devices (NSR and DPF) was developed by Toyota and called Diesel Particulate NO x Reduction (DPNR) [31,32]. DPNR technology is based on the use of a particulate wall-flow filter coated with an NSR catalyst layer working under cyclic conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Particulate filter regeneration is effective during the lean phase due to the presence of NO x and an excess of oxygen in the exhaust gas, similar to CRT technology. Soot oxidation is also claimed to occur during the rich phase [31].…”

Section: Introductionmentioning

confidence: 99%