Catalytic combustion of diesel soot on Co,K/MgO catalysts. Effect of the potassium loading on activity and stability

Querini, C.A.; Cornaglia, Laura María; Ulla, Maria Alicia del H.; Miró, Eduardo Ernesto

doi:10.1016/s0926-3373(98)00109-x

Cited by 103 publications

(58 citation statements)

References 19 publications

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“…This observation seems to be related with the higher dispersion of metal particles on KCu2/Al 2 O 3 . It is also related, with the fact that metal oxides can catalyse the oxidation of soot [19][20][21][22]. Finally, as it was above commented, the support acidity seems to explain the difference in the C 3 H 6 conversion [12].…”

Section: Overviewmentioning

confidence: 99%

Performance of potassium-promoted catalysts for NO x and soot removal from simulated diesel exhaust

Nejar

Illán-Gómez

2007

Top Catal

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In order to elucidate the effect of support in the catalytic performance, two selected potassium-promoted catalysts (K1Cu/beta and KCu2/Al 2 O 3 ) were tested for the simultaneous NO x /soot removal from a simulated diesel exhaust. For comparative purpose, the behaviour of a platinum catalyst (Pt/beta) was also studied. Isothermal experiments revealed that the potassium-promoted catalysts show a high activity for NO x /soot removal in the 350-450°C temperature range. In addition, the catalysts present the advantage that the main reaction products are N 2 and CO 2 . Among the catalysts tested, KCu2/Al 2 O 3 presents the best global performance at 450°C: the highest soot consumption rate, even higher than the platinum catalysts, and a high NO x reduction.

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Section: Overviewmentioning

confidence: 99%

Performance of potassium-promoted catalysts for NO x and soot removal from simulated diesel exhaust

Nejar

Illán-Gómez

2007

Top Catal

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“…For an example, the T i and T p of Co-based catalysts decrease to 269°C and 350°C from 316°C and 430°C respectively, due to the promoting effect of potassium. The promoting effect on soot oxidation is contributed to the increase of surface mobility by loading potassium, improving the contact between solid catalyst and solid soot [24].…”

Section: Catalytic Performance Of Diesel Soot Oxidationmentioning

confidence: 99%

Catalytic oxidation of diesel soot on mixed oxides derived from hydrotalcites

Wang

Shangguan

et al. 2006

Catal Lett

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MAlO (where M = Ni 2+ , Co 2+ and Cu 2+ ) mixed oxides derived from hydrotalcites and potassium-promoted MAlO catalysts (designated as K/MAlO; K: 5 wt.%) have been studied for diesel soot oxidation. The catalysts were characterized by XRD, N 2 adsorption, TPR, FT-IR and TPO techniques. The hydrotalcites calcined at 800°C have large surface areas in the range 17-88 m 2 / g and uniform mesoporous features, which resulted in high activity for diesel soot oxidation under the conditions of tight contact between soot and catalyst powders. Potassium increased the activity due to the improvement of surface mobility. The presence of NO x considerably enhanced the catalytic soot oxidation rate. The enhancement was attributed to the acceleration of soot oxidation due to NO 2 as a strong oxidizing agent and intermediates of nitrate and/or nitrite species formed on the catalyst surface.

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“…It was found that Ba-containing systems show good performances both in removal of particulate matter and NO x . Potassium is another element that has shown potential as a NO x storage component; besides, in several papers [5][6][7][8][9][10] it has been reported that potassium shows distinct activity in the soot oxidation. Accordingly, in this work the potentiality of a K-based catalyst in the simultaneous removal of particulate matter and NO x was investigated.…”

Section: Introductionmentioning

confidence: 99%

High performances of Pt-K/Al2O3 versus Pt-Ba/Al2O3 LNT catalysts in the simultaneous removal of NO x and soot

et al. 2007

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The potentiality of a Pt-K/Al 2 O 3 catalyst in the simultaneous removal of particulate matter (soot) and NO x is investigated in this work by means of Temperature Programmed Oxidation (TPO) experiments and Transient Response Method (TRM), and compared with Pt-Ba/Al 2 O 3 . The results point out the higher performances of K-based sample in the soot combustion as compared to the Ba-based catalyst, and similar behaviour in the NO x -storage.

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Catalytic combustion of diesel soot on Co,K/MgO catalysts. Effect of the potassium loading on activity and stability

Cited by 103 publications

References 19 publications

Performance of potassium-promoted catalysts for NO x and soot removal from simulated diesel exhaust

Performance of potassium-promoted catalysts for NO x and soot removal from simulated diesel exhaust

Catalytic oxidation of diesel soot on mixed oxides derived from hydrotalcites

High performances of Pt-K/Al2O3 versus Pt-Ba/Al2O3 LNT catalysts in the simultaneous removal of NO x and soot

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