抄録
Although iron and tin compounds were well known as the classical catalysts for the coal liquefaction, recent interest has been focussed on the various petroleum catalysts being developed for the hydrodesulfurization of heavy oil fractions.
It has been clarified that the deactivation of catalysts due to carbon deposit and mineral matters of coal take place strongly in the coal liquefaction process. Therefore, Some new processes being developed in USA do not use any catalysts except mineral matters from coal.
The effect of mineral matters of coal, metallic chlorides and hydrodesulfuriza-tion catalysts for petroleum were compared and discussed according to the recent publications.
