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Temperature‐Programmed Oxidation of Soot in a Hybrid Catalysis‐Plasma System
Author(s) -
Lin H.,
Huang Z.,
Shangguan W. F.
Publication year - 2008
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.200700315
Subject(s) - soot , catalysis , dissociation (chemistry) , chemistry , radical , nonthermal plasma , ignition system , thermal decomposition , plasma , oxide , molecule , redox , inorganic chemistry , analytical chemistry (journal) , combustion , organic chemistry , thermodynamics , quantum mechanics , physics
Non‐thermal plasma (NTP) technology was applied to promote the temperature‐programmed oxidation (TPO) of soot over a perovskites type of La 0.8 K 0.2 MnO 3 catalyst. The O radicals originating from the decomposition of O 2 , as well as NO dissociation if nitrogen oxide were involved, reduce the ignition temperatures of soot. In NO‐O 2 ‐He, for example, the ignition temperature decreased to 240 °C from 290 °C as the voltage increased from 0 kV to 15 kV. The higher voltage also benefited the adsorption of NO molecules onto the catalyst surface (NO ad ). As a result, the maximum N 2 /NO ratio (conversion ratio of NO into N 2 ) rose from 23 % to 53 %. Some of the NO molecules were dissociated into N and O radicals in plasma, and hence, the N 2 /NO ratio was further enhanced due to the combination of N atoms. In any case, the redox process between NO x and soot proved to be important in soot oxidation.