There are several types of composite catalysts, including: - Bimetallic Catalysts: These consist of two different metals, which can create unique active sites and enhance catalytic performance. - Core-Shell Catalysts: These have a core material surrounded by a shell, which can protect the core and provide additional catalytic sites. - Supported Catalysts: These involve dispersing the active phase on a support material, improving its stability and dispersion. - Hybrid Catalysts: These combine different types of catalysts or catalytic materials to leverage the benefits of each.