Abstract
Oxidation of soot by corona plasma was investigated at conditions of exhaust gases from diesel engines, both in the absence and presence of CoO x as a catalyst. The CoO x catalyst nanoparticles were synthesized by a precipitation method. The BET surface area of the catalyst was 50 m2/g, corresponding to 23 nm particles. An aluminum grid was sequentially dip-coated for several times by suspensions of the soot in toluene and/or fine catalyst powder in DI water. The grid was used as the plate of a pin-to-plate corona reactor. Air at 180 °C was passed through the corona reactor to oxidize the soot, oxidation products of which were analyzed by both gas chromatograph and FTIR with a gas cell. Soot oxidation rate linearly increased with an increase of input energy. When the soot was deposited on a layer of the CoO x catalyst, the soot oxidation rate increased up to 2 times. The only product of the plasma (catalytic) oxidation of soot was CO 2 determined by FTIR. O produced in the plasma discharge oxidized the soot and the active surface oxygen enhanced its rate.
Highlights
Gasoline and diesel engines play important roles in urban air pollution
We investigated the effect of input energy and catalyst and distribution of products
The soot oxidation of exhaust gas from diesel engine was investigated by non-thermal plasma using a batch-type corona reactor with pin-to-plate electrode configuration without and with CoOx catalyst
Summary
Gasoline and diesel engines play important roles in urban air pollution They emit a large amount of pollutants, including particulate matter (PM), carbon monoxide (CO) and nitrogen monoxide (NO). The conventional methods are dust collection using a filter and soot oxidation by combustion They have a disadvantage of lowering the efficiency of soot suppression.[2] As a result, Non-thermal plasma (NTP) processing has been attracted a lot of attention as the effective method to remove soot at low temperatures. It consists of free electrons as well as highly excited reactive radicals and ions
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