Structured Catalysts for Soot Combustion for Diesel Engines

Banús, Ezequiel David; Ulla, Maria Alicia del H.; Miró, Eduardo Ernesto; Milt, Viviana Guadalupe

doi:10.5772/54516

Cited by 11 publications

(18 citation statements)

References 97 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A wide variety of active phases have been reported for the catalytic oxidation of contaminants present in emission sources. In this sense, different types of supports have been studied, such as: simple and compound oxides, and zeolites and clays, among others [9][10][11][12]. It is possible to differentiate between catalysts based on oxidic phases, and those based on supported metallic phases.…”

Section: Introductionmentioning

confidence: 99%

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

et al. 2019

View full text Add to dashboard Cite

This work presents the physicochemical characterization and activity of zirconia-supported silver catalysts for the oxidation of pollutants present in diesel engine exhaust (propane, propene, naphthalene and soot). A series of silver-supported catalysts AgxZ (x = 1, 5 and 10 wt.%, Z = zirconia) were prepared, which were studied by various characterization techniques. The results show that silver is mainly found under the form of small metal nanoparticles (<10 nm) dispersed over the support. The metallic phase coexists with the AgOx oxidic phases. Silver is introduced onto the zirconia, generating Ag–ZrO2 catalysts with high activity for the oxidation of propene and naphthalene. These catalysts also show some activity for soot combustion. Silver species can contribute with zirconia in the catalytic redox cycle, through a synergistic effect, providing sites that facilitate the migration and availability of oxygen, which is favored by the presence of structural defects. This is a novel application of the AgOx–Ag/ZrO2 system in the combustion reaction of propene and naphthalene. The results are highly promising, given that the T50 values found for both model molecules are quite low.

show abstract

Section: Introductionmentioning

confidence: 99%

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The A/F mixture, however, is not homogeneous and always consists of fuel-rich and lean regions. The heterogeneity in the composition of the fuel-air mixture in the combustion chamber of a diesel engines produces contaminant emissions or pollutants [4]. The emissions contain significant amount of particulate matter (PM) and oxides of nitrogen (NOx) as compared with unburned hydrocarbon (HC) and carbon monoxide (CO).…”

Section: Introductionmentioning

confidence: 99%

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

Trivedi

Прасад

2018

Sādhanā

View full text Add to dashboard Cite

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.

show abstract

“…Diesel engines have a variety of advantages over other engines types, such as higher fuel economy, reliability, durability as well as low maintenance costs [1]. Despite these advantages diesel engines have some drawbacks, one of which is high amount of particulate matter (PM) emissions, which mainly consist of carbonaceous soot and soluble organic fraction (SOF) of hydrocarbons [2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Performance of Transition Metal Based Perovskite Catalysts for Diesel Soot Oxidation

Mishra

Прасад

2017

Bull. Chem. React. Eng. Catal.

View full text Add to dashboard Cite

In present investigation, the effect of the intrinsic factors including the structure, nature of B-site ions in the four systems LaCoO3, LaNiO3, LaFeO3 and LaZnOy perovskite-type oxide catalysts, and the external factors of catalyst-soot contacting model, and the operating parameters such as air flow rate and temperature on the catalytic performances for the combustion of diesel soot were reported. The catalysts were characterized by XRD, FTIR, SEM, and N2-sorption. Activity of the catalyst for soot oxidation was evaluated on the basis of light off temperature characteristics Ti, T50 and T100. LaCoO3, LaFeO3 and LaNiO3 samples possessed the perovskite structure, and gave high activities for the total oxidation of soot below 445 o C. Whereas, LaZnOy catalyst was not indicating the ABO3 perovskite structure and existed as a mixture of metal oxides. The activity order in decreasing sequence of the catalyst was as follows: LaCoO3>LaFeO3>LaNiO3>LaZnOy. SEM pictures of the perovskite samples showed that the particles sizes were close to 100 nm.

show abstract

Structured Catalysts for Soot Combustion for Diesel Engines

Cited by 11 publications

References 97 publications

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

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

Synthesis and Performance of Transition Metal Based Perovskite Catalysts for Diesel Soot Oxidation

Contact Info

Product

Resources

About