Process for producing a filter element und a catalyst carrier with improved resistance to alkali and

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The production of ceramic bodies from cordierite comprises sintering the ceramic bodies and coating the ceramic bodies with protective layer for protecting the cordierite against alkaline and/or alkaline-earth ions contained in a exhaust gas. The protective layer consists of cordierite, boehmite with a particle diameter of 8-25 nm and fibers and is converted into gamma -aluminum oxide by heat treatment after applying on the body. The protective layer is applied on the pores between the grains of the body by dipping-, extraction- and sol-gel process. The protective layer is applied in the form of a suspension in water or in diluted hydrochloric acid, nitric acid and/or acetic acid. An independent claim is included for a ceramic body produced from cordierite.