The preparation process of the catalyst is the key to its technology, so it is basically kept secret. Generally speaking, for the honeycomb ceramic-based supported three-effect automobile exhaust purification catalyst, the preparation process is roughly
Other types of automobile exhaust purification catalysts are generally similar to them.
For the automobile exhaust purification catalyst as a whole, the preparation of the active center structure, the loading technology and the coating technology are the three key points that affect the performance of the catalyst, and none of them are indispensable. In preparation, the active component for impregnation can be a noble metal solution or a composite common metal salt solution. It was agreed that the precious metal nitrate was superior to chloride. For the metal honeycomb carrier coating, in recent years, a metal wall and catalytic layer integration technology has been introduced. It is to anodic oxidize metal aluminum with 2% ~ 6% oxalic acid at room temperature into an alumina film, and then hydrate It is treated and roasted at 350 ℃ to form a porous carrier, and then the active component is loaded on the carrier by the impregnation method, and the metal can be made into a honeycomb shape in advance.