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.
Today's modern catalytic wood burning stoves are designed so that flame impingement is
unlikely. However, it is still
impossible. A strong fast draft can pull the flames around the flame shield and
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.