Application of potash glass as a catalyst for diesel soot oxidation

An, Hongmei; Su, Changsheng; McGinn, Paul J.

doi:10.1016/j.catcom.2008.10.019

Cited by 27 publications

(22 citation statements)

References 34 publications

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“…In previous testing glass powder synthesized through traditional melt processes with the composition 52 wt% SiO 2 , 35 wt% K 2 O, and 13 wt% CaO (~At%: 47% Si, 40% K, 13% Ca respectively) was shown to be promising as a K-glass catalyst [12]. This composition will be referred to as KCS- were used as starting materials, following a well-known approach [13].…”

Section: Experimental Methodsmentioning

confidence: 99%

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Catalytic diesel soot oxidation by hydrothermally stable glass catalysts

Zokoe

McGinn

2015

Chemical Engineering Journal

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Section: Experimental Methodsmentioning

confidence: 99%

“…These were made by melting a stoichiometric mixture of carbonate powders as described previously [9,12]. 8 x 5 x 3 mm 3 (L x W x H) rectangular slices were subsequently cut from the cooled bulk glass.…”

Section: Experimental Methodsmentioning

confidence: 99%

Catalytic diesel soot oxidation by hydrothermally stable glass catalysts

Zokoe

McGinn

2015

Chemical Engineering Journal

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“…[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] This also applies to Kc ompounds as promoters for oxidic catalysts. [12,19,[44][45][46][47][48][49][50][51] As stated above, the mechanistic role of Ki sn ot yet clear,and atremendous number of postulated mechanisms can be found in the literature. These mechanismsr ange from broad general statements to very specificp rinciples: * Kf acilitatesc ompounds with low melting points or eutectic mixtures, [14,[51][52][53] * Kacts as an electron donor with surface oxygen ast he electron acceptor (and subsequentf ormation of phenoxide species or gaseous K), [30,31,50,51] * Kd ecreases the stability of carbonates on the surface, which leads to lower decomposition temperatures of the carbonates, [51,54,55] * general discussions between redox-type oxygen-or electron-transfer mechanisms [12,16,28,31,34,35,39,…”

Section: Introductionmentioning

confidence: 99%

Catalytic Effect of Potassium Compounds in Soot Oxidation

2017

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The combustion temperatures of soot in particulate filters can be decreased to exhaust gas temperatures by using catalysts. In addition to oxidic catalysts, alkali metal salts are very effective catalysts. Although soot is one of the world's most unwanted byproducts, combustion is still not fully understood. In this study, different soot mixed internally with salt samples were produced. All salts lead to a marked, salt‐ and salt‐content‐dependent decrease of the temperature‐programmed oxidation temperatures of maximum CO + CO2 emissions (Tmax), with K2CO3 being one of the most effective catalysts that leads to a decrease of the Tmax of up to 300 °C. Structural parameters of the internally mixed soot derived by using Raman microspectroscopy, SEM, and scanning mobility particle size analysis did not change significantly; BET areas showed slight trends to lower areas with increased salt content, but no substantial correlations were observed. In contrast, a correlation of the oxidation reactivity to the number distribution of the measured actual fringe lengths by using high‐resolution transmission electron microscopy and the peak areas measured by using EPR spectroscopy was found. Salts lead to a narrowing of the actual fringe length number distributions to lower sizes and to reduced EPR peak areas. This demonstrates that the salts influence the nanostructure of the graphene planes by shortening the planes and further substantiates that soot oxidation is at least partly based on electron transfer and not only oxygen transfer. EPR spectroscopy measurements indicate that the oxidation mechanism is based on a temperature‐dependent chemical equilibrium, which depends on the K+/anion binding strength.

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“…Examples of the use of mixed oxides (potassium bulk promotion) as catalysts include K 6 [17] or KVO 3 and K 4 V 2 O 7 [18]. Potassium containing glasses [19,20] have also been found recently as a component of the most active soot combustion catalysts [21].…”

Section: Introductionmentioning

confidence: 99%

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

et al. 2016

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A series of potassium-promoted spinels (Mn, Fe, Co) were prepared with various K ? promoter locations: on the surface (surface promotion) or in the bulk (formation of new layered and tunneled nanostructures via solid state reaction). All prepared samples were characterized by means of X-ray diffraction, Raman spectroscopy, X-ray fluorescence and N 2 -BET specific surface area analysis. Catalytic activity in soot combustion in different reaction conditions was investigated (tight contact, loose contact, loose contact with NO addition). It was shown that in all cases the nanostructuration is more effective than the surface promotion, with the layered structures of KCo 4 O 8 , KMn 4 O 8 being the most catalytically active phases, lowering the soot combustion down to 250°C. The difference in activity between tight and loose contacts can be bridged in the presence of NO due to its transformation into NO 2 , which acts as the oxygen carrier from the catalyst surface into soot particles, eliminating the soot-catalyst contact difference.

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Application of potash glass as a catalyst for diesel soot oxidation

Cited by 27 publications

References 34 publications

Catalytic diesel soot oxidation by hydrothermally stable glass catalysts

Catalytic diesel soot oxidation by hydrothermally stable glass catalysts

Catalytic Effect of Potassium Compounds in Soot Oxidation

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

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