Multilayered catalyst and method for preparation thereof

(57) Summary book invention contains (4) catalyst layers in at least four layers, i. E. , (1) porosity support medium, (2) buffer layers, (3) interface layers, and arbitration. The buffer layer concerned offers changes of the coefficient of thermal expansion from the porosity support medium concerned to the interface layer concerned, and reduces the thermal expansion stress produced when the catalyst concerned is heated by it to a high work temperature. This invention method for making the catalyst which consists of at least three layers, (1) the process of choosing a porosity support medium, and (2) -- the process of carrying out the solution deposition of the interface layer on it, and (3) -- having a process which makes catalyst material deposit on the interface layer --; -- the improving method -- (4) -- include the process which makes a buffer layer deposit between the porosity support medium concerned and the interface layer concerned.