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Potassium‐Activated Wire Mesh: A Stable Monolithic Catalyst for Diesel Soot Combustion
Author(s) -
Qi Guolu,
Zhang Yexin,
Chen Aibing,
Yu Yifeng
Publication year - 2017
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201600137
Subject(s) - soot , diesel exhaust , diesel particulate filter , combustion , materials science , diesel fuel , catalysis , chemical engineering , potassium , metal , diesel engine , chemistry , metallurgy , organic chemistry , automotive engineering , engineering
Potassium‐modified FeCrAl alloy wire mesh was developed as a catalytic diesel particulate filter to suppress the emission of soot from a diesel engine. Potassium species were deposited on wire mesh by a chemical vapor deposition method, in which a model soot was used to convert KOH into metallic K at high temperatures to subsequently activate the wire mesh. Tests showed that metallic K reacted with the enriched Al 2 O 3 component on the surface derived from segregation and successive oxidation during precalcination. The resulting layer of K‐O‐Al species offers remarkable activity and stability for the catalytic oxidation of diesel soot. The K‐activated wire mesh could lower the initial temperature of soot combustion and maintain the activity for several cycles.