The impact of CO and C3H6 pulses on PtO reduction and NO oxidation in a diesel oxidation catalyst

With the purpose of studying the effect of diesel oxidation catalyst (DOC) on the NO oxidation activity, a series ofxMn10Ce/γ-Al2O3(x= 4, 6, 8, and 10) catalysts were synthesized by acid-aided sol-gel method. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Transmission Electron Microscope (TEM). Result showed that the crystalline size of MnOxand CeO2ranges from 5 nm to 30 nm and manganese existed mainly in the catalysts in the form of manganese dioxide. Moreover, NO oxidation experiments were carried out to evaluate the activity of the catalysts; according to the results, 6Mn10Ce/γ-Al2O3catalyst showed the supreme NO oxidation activity with a NO to NO2conversion rate of 83.5% at 300°C. Compared to 500 ppm NO inlet concentration, the NO conversion was higher than that of 750 and 1000 ppm NO over 6Mn10Ce/γ-Al2O3catalyst in the temperature range of 150–300°C.

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Evaluation of H2 effect on NO oxidation over a diesel oxidation catalyst

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2015.05.054 ◽

2015 ◽

Vol 179 ◽

pp. 542-550 ◽

Cited By ~ 10

Author(s):

Muhammad Mufti Azis ◽

Xavier Auvray ◽

Louise Olsson ◽

Derek Creaser

Keyword(s):

Diesel Oxidation Catalyst ◽

No Oxidation ◽

Oxidation Catalyst ◽

Diesel Oxidation ◽

H2 Effect

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Assessment of the Impact of Trace Elements in FAME Biodiesel on Diesel Oxidation Catalyst Activity after Full Lifetime of Operation in A Heavy-Duty Truck

Catalysts ◽

10.3390/catal10121439 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1439

Author(s):

Jonas Granestrand ◽

Rodrigo Suárez París ◽

Marita Nilsson ◽

Francesco Regali ◽

Lars Pettersson

Keyword(s):

Trace Elements ◽

Catalyst Activity ◽

Acid Methyl Ester ◽

Diesel Oxidation Catalyst ◽

Oxidation Catalyst ◽

Heavy Duty ◽

Heavy Duty Truck ◽

Diesel Oxidation ◽

The Impact ◽

Element Removal

Fatty acid methyl ester (FAME) biodiesel contains some trace amounts of Na, K, P, Ca, and Mg. Our objective was to investigate whether the presence of such elements can poison a diesel oxidation catalyst that has been used for an entire regulatory lifetime in a heavy-duty truck fueled by FAME biodiesel. The investigated vehicle-aged catalyst contained high loadings of S, P, and Na, as well as a visible layer of soot. Activity in the NO oxidation reaction was severely decreased compared to a fresh catalyst of the same type, while the CO and C3H6 oxidation reactions were less affected. Subsequent selective trace element removal procedures, followed by activity tests, were used to decouple the effect of different poisons. Sintering was observed to be the main cause of catalyst deactivation. Of the trace elements present on the catalyst, P had the greatest effect on catalyst activity, while the other trace elements had little effect.

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