Soot buildup is removed by heating the filter until the soot oxidizes and becomes carbon dioxide gas. This process is called what?

Soot buildup is removed by heating the filter until the soot oxidizes and becomes carbon dioxide gas. This process is called what?

• A. Pyrolysis
• B. Filtration
• C. Adsorption
• D. Regeneration

Answer: (D)

Regeneration is the process of cleaning a diesel particulate filter by burning off the accumulated soot. When the filter reaches a high enough temperature with oxygen present, the soot oxidizes and turns into carbon dioxide, freeing the filter to again flow exhaust efficiently. This is different from just breaking down material without oxidation (pyrolysis), which doesn’t remove soot by burning it off. Filtration describes trapping particles, not removing them by combustion. Adsorption involves molecules sticking to a surface, not burning off soot in the filter. So the cleaning action described—soot oxidizing to CO2 at high temperature in the presence of oxygen—fits regeneration.

Regeneration is the process of cleaning a diesel particulate filter by burning off the accumulated soot. When the filter reaches a high enough temperature with oxygen present, the soot oxidizes and turns into carbon dioxide, freeing the filter to again flow exhaust efficiently. This is different from just breaking down material without oxidation (pyrolysis), which doesn’t remove soot by burning it off. Filtration describes trapping particles, not removing them by combustion. Adsorption involves molecules sticking to a surface, not burning off soot in the filter. So the cleaning action described—soot oxidizing to CO2 at high temperature in the presence of oxygen—fits regeneration.