期刊
APPLIED CATALYSIS A-GENERAL
卷 498, 期 -, 页码 41-53出版社
ELSEVIER
DOI: 10.1016/j.apcata.2015.03.019
关键词
Diesel particulate filter; Sepiolite; Wall-flow monoliths; Pore-generating agents; Self-regeneration
资金
- ANPCyT (Argentina)
- CONICET (Argentina)
- SECTEI Santa Fe (Argentina)
- UNL (Argentina)
- Spanish MINECO [CTQ2011-25517]
- Program ALCCONES of the CAM [S2013/MAE-2985]
Wall-flow monolithic filters are commonly made of silicon carbide or cordierite and present high porosity, but low surface area. Alternatively, wall-flow monoliths with high surface area can be employed as support for active phases that catalyze the elimination of the particles deposited in the pores. In this study, mesoporous monoliths with tailored macroporosity are obtained by extrusion using sepiolite clay and different pore generating agents. Cobalt, barium and potassium were incorporated as active phases during the kneading of the dough or by impregnation of the structured material to give the monoliths the capacity for catalytically burning soot under the conditions of diesel engine exhausts. The incorporated and impregnated catalytic monoliths were morphologically, mechanically and physical-chemically characterized at different preparation stages to study the influence of support porosity and the method of addition of active phases in the catalytic activity for diesel soot combustion. The most active catalyst was obtained impregnating the active components to a previously extruded monolith calcined at 850 degrees C, and then calcining the assembly at 600 degrees C, for which the temperature of maximum soot combustion rate was 385 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
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