The catalyst carrier is a framework for supporting the active components

The catalyst carrier is a dispersant, a binder and a support for the active components of the catalyst, and is a framework for supporting the active components.

For example, Ag in the catalyst for oxidizing ethylene to ethylene oxide is supported on "α-Al2O3, where α-Al2O3 is called a carrier.

Carriers are also often divided into inert carriers and active carriers. Strictly speaking, the components in the catalyst are not inert, and they all affect the main agent and the auxiliary agent, but the effect of the active carrier is more obvious.

The role of the carrier and the role of the co-catalyst are similar in many aspects, the difference is that the amount of the carrier is large and the amount of the co-catalyst is small; the former has a moderate effect, and the latter is more obvious. In addition, due to the large amount of support, the catalyst can be endowed with basic physical structure and properties, such as pore structure, specific surface, macroscopic appearance, mechanical strength, etc. In addition, it has a dispersing effect on the main catalyst and co-catalyst, especially for precious metals, which can not only reduce the amount of the catalyst, but also improve its activity and reduce the cost of the catalyst. As an efficient catalyst, the selection of active components and substrates are very important.

The classification of carriers and some common types of carriers as follows: