Method for producing a filter element and a support structure for a catalyst having improved resista

文件类型：PDF文档
文件大小：159K
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.