a catalyst carrier body includes at least one housing , a honeycomb body and a passivation layer which includes a multiplicity of separate crystal agglomerations with an averaged height lying in the range of 0 . 3 to 1 . 5 μm . various production methods are proposed which are suitable , in particular , for producing such catalyst carrier bodies . thus , the formation of the passivation layer takes place by the blending and / or mixing of an adhesive with a passivating substance and subsequently applying the adhesive , or by roughening a region using a blast - cutting manufacturing method with corundum particles being employed as the blasting medium . a barrier is thereby provided in a very simple and cost - effective way which , for example during the formation of brazed connections , prevents the then liquid brazing material from being distributed beyond the desired tying regions as a result of capillary effects .