Why is 'flame impingement' bad for the catalyst?
Direct flame contact is death to the catalyst. A catalyst burns the byproducts
in the smoke. The gases such as CO, HC, and O2 ignite with each other in a
chemical reaction in the presence of the catalyst (while passing through the
honeycomb configuration).
Direct flame inhibits this reaction by changing the chemical make-up of the catalyst breaking down the substrate or ceramic. (thermal cracking)
Direct flame inhibits this reaction by changing the chemical make-up of the catalyst breaking down the substrate or ceramic. (thermal cracking)
Today's modern wood burning stoves are designed so that flame impingement is
unlikely. However, it is not impossible. A strong fast draft can pull the
flames into the catalyst. A hot fire with all the primary air controls wide
open or perhaps the firebox door or ash pan door ajar are other ways the catalyst
might receive flame impingement.
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