Abstract: The study on catalytic phases and hydrotreating mechanism of transition metal sulfide (TMS） catalysts used in production of clean fuels has received considerable attention. In this paper，the importance of study on catalytically stable active phases of TMS catalysts is emphasized，and the existence and role of carbon in catalytic stable states are summarized and some novel catalytically stable active phases，such as MoSxCy and CoMoC/NiMoC are presented and discussed. At Last，it is pointed out that the conventional CoMoS may be not a catalytically stable active phase but only a precursor，and that some hydrotreating catalysts such as transition metal carbide and TMS may well possess an uniform MoSC-like active phase stucture under catalytical conditions.

Key words: transition metal sulfide, catalytic stable state, active phase, MoSxCy, carbide, transition metal sulfide, catalytic stable state, active phase, MoSxCy, carbide

摘要： 过渡金属硫化物（TMS）是清洁燃料油生产最为常用的催化剂，有关它的催化活性相及其作用机理一直以来是催化研究的重点和热点。本文一方面强调研究TMS催化稳定态活性相的重要性；另一方面综述了催化稳定态中碳的存在形式及其作用，对新提出的MoSxCy和CoMoC（或NiMoC）模型进行了阐述和讨论，指出传统CoMoS相可能并不是稳定态的催化活性相，而只是其前体，并认为过渡金属碳化物与TMS等加氢处理催化剂很可能具有统一的类MoSC催化稳态活性相结构。

关键词: 过渡金属硫化物, 催化稳定态, 活性相, MoSxCy, 碳化物, 过渡金属硫化物, 催化稳定态, 活性相, MoSxCy, 碳化物