Study on Effects of Commercial Catalysts on Coal Hydroliquefaction

The coal hydroliquefaction is conducted in a magnetically stirred autoclave. The effects of five commercial catalysts are investigated in both separate and combined use. It is found that if the hydrocracking catalyst and the hydrorefining catalyst are used in ratio of 1:1, both high coal conversion and oil yield can be obtained, and the hydrogen consumption is low. Further studies show that relatively low temperature is favorable for this blend catalyst. The optimum liquefaction temperature varies with the variation of other reaction conditions. The influence of hydrogen pressure on liquefaction is more significant in the presence of catalyst. Large catalyst amount is beneficial to liquefaction, but it is restricted by the consideration of cost.