Catalytic combustion of diesel soot: Experimental design for laboratory testing

Peralta, Marcela; Gross, Martin; Sánchez, Bárbara Sabrina; Querini, C.A.

doi:10.1016/j.cej.2009.04.044

Cited by 32 publications

(26 citation statements)

References 36 publications

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“…12 show that only for the highest sootcatalyst ratio the soot combustion curve shis towards higher temperatures, thus showing a lower catalytic activity. These results are in accordance with those previously published in the literature by Peralta et al 51 They suggested that not all the soot particles are in complete contact with the catalyst particles, so at a certain point of soot conversion there is an important loss in the extent of the soot-catalyst contact, being more critical at high soot-catalyst ratios and therefore a lower reaction rate is observed.…”

Section: Mechanical Stabilitysupporting

confidence: 95%

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

2015

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This work presents a comparative study between the catalytic performance of the 2% CuO/ceria-zirconia powder catalyst and the same catalyst supported on silicon carbide DPF (Diesel Particulate Filter) towards NO oxidation reaction and soot combustion reaction. The ceria-zirconia catalyst was prepared by the coprecipitation method and 2 wt% copper was incorporated by the incipient wetness impregnation method. The catalyst was incorporated onto the ceramic support using a simple and organic solvent-free procedure by a simply dipping the DPF into an aqueous solution of the catalyst. The powder catalyst has been characterized using N 2 adsorption at À196 C, XRD and Raman Spectroscopy; whereas the catalytic coating morphology has been evaluated by SEM and the mechanical stability by an adherence test. Both catalyst configurations were tested for NO oxidation to NO 2 and for soot combustion under NO x /O 2 .The results revealed that incorporation of the very active copper/ceria-zirconia catalyst onto SiC-DPF has been successfully achieved by a simple coating procedure. Furthermore, the catalytic coating has shown suitable mechanical, chemical and thermal stability. A satisfactory catalytic performance of the catalytic-coated filter was reached towards the NO oxidation reaction. Moreover, it was proved that the catalytic coating is stable and the corresponding coated DPF can be reused for several cycles of NO oxidation without a significant decrease in its activity. Finally, it was verified that the loose-contact mode is a good choice to simulate the catalytic performance of this active phase in a real diesel particulate filter.

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Section: Mechanical Stabilitysupporting

confidence: 95%

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

2015

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“…The occurrence of this uncontrolled regeneration of soot depends upon the technique being used. The reaction mechanism is very complex and that there are many factors to be taken into account, such as low catalyst/soot weight ratio, low heat conductivity and low oxygen pressure [7,23,24]. In the present work, Ba was impregnated on the MnO x -CeO 2 , MnO x and CeO 2 supports to modify the NO x storage behavior of the catalysts.…”

Section: Introductionmentioning

confidence: 98%

“…The NO x storage feature of alkali and alkaline earth metals can provide additional desorbed NO 2 at moderate temperatures and thus make them a promising component in soot oxidation catalysts. Potassium has been widely introduced to catalysts to reduce the maximal soot oxidation temperature (T m ) to 350 • C or even lower owing to the high NO x storage capacity and low molten point of potassium salts [4][5][6][7][8][9][10]. Recently, barium has received more and more attention in simultaneous removal of soot and NO x by Pt-containing NSR (NO x storage reduction) catalysts [11,12] and catalytic oxidation of soot by potassium-copromoted catalysts (Ba,K/CeO 2 [13,14], Co,Ba,K/CeO 2 [15], Co,Ba,K/ZrO 2 [16,17] and Co,Ba,K/Al 2 O 3 [18]).…”

Section: Introductionmentioning

confidence: 99%

Nitrate storage behavior of Ba/MnOx–CeO2 catalyst and its activity for soot oxidation with heat transfer limitations

Liu

Fan

et al. 2010

Journal of Hazardous Materials

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“…The mixture hasbeen obtained by mixing each catalyst with soot with a spatulafor 10 min realizing a so-called loose contact [39], which indeed issimilar to the contact that arises during practical conditions. It isworth of note that the selected soot/catalyst ratio is very commonin laboratory tests and, according to literature indications, it allowsa correct investigation of the reactivity of soot oxidation catalysts [11,40].In the TPO measurements, 20 mg of the above mixture wereheated at a constant rate (10•C/min) in a quartz reactor underNO/O2gas flow (10% O2(v/v) + 500 ppm NO, balance N2; totalflow 0.5 l/min). The catalyst temperature was measured by achromel-alumel thermocouple, located on the catalyst bed.…”

Section: Catalytic Tests and Methodsmentioning

confidence: 99%

Silver-based catalytic materials for the simultaneous removal of soot and NO

et al. 2015

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The potential of silver-based catalysts in the simultaneous removal of particulate matter (soot) and NOxis investigated in this work and compared with that of a model Pt-Ba/Al2O3catalyst. The Ag (5 wt%) -Ba(10 wt%)/MO (MO = CeO2, ZrO2, Al2O3) and Ag (5 wt%) -Sr (10 wt%)/CeO2catalysts have been preparedby incipient wetness impregnation and characterized by BET, XRD, HRTEM, XPS and temperatureprogrammed reduction (TPR) experiments. The behavior of the catalyst in the soot combustion (underloose conditions) and NOxremoval has been separately analyzed by means of temperature programmedoxidation (TPO) and isothermal concentration step change (ICSC) experiments, respectively. The resultsshow that all the catalysts are active in soot combustion with a significant decrease of oxidation onsettemperature compared to uncatalyzed soot oxidation. The removal of NOxin the absence and in the pres-ence of soot was investigated under cycling conditions, i.e. alternating lean-rich phases according to theLNT strategy. It has been found that the Ag-based samples are able to simultaneously remove soot andNOx. In particular, comparing the behavior of the prepared catalysts, the Ba-containing systems showedhigher NOxstorage capacity than Sr-catalyst; also, the nitrogen selectivity increased even if resultedlower than the traditional LNT Pt-based catalyst. A detrimental effect of soot on the NOxstorage activityhas been also observed

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Catalytic combustion of diesel soot: Experimental design for laboratory testing

Cited by 32 publications

References 36 publications

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

Nitrate storage behavior of Ba/MnOx–CeO2 catalyst and its activity for soot oxidation with heat transfer limitations

Silver-based catalytic materials for the simultaneous removal of soot and NO

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Catalytic combustion of diesel soot: Experimental design for laboratory testing

Cited by 32 publications

References 36 publications

Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot

Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot

Nitrate storage behavior of Ba/MnOx–CeO2 catalyst and its activity for soot oxidation with heat transfer limitations

Silver-based catalytic materials for the simultaneous removal of soot and NO

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About

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot