Several metal sulfides are commonly used in catalysis, including molybdenum disulfide (MoS2), tungsten disulfide (WS2), and cobalt sulfide (CoS). These materials are often combined with other metals to form bimetallic or trimetallic catalysts, which can further enhance their catalytic performance. For example, Co-Mo-S and Ni-Mo-S catalysts are frequently used in hydroprocessing applications.