石炭液化油のアップグレーディング反応におけるNi-W/Al₂O₃触媒の活性低下

抄録

Coal-derived liquid contains a large amount of nitrogen compounds which should be removed for a clean motor fuel. In the coal liquefaction project in Japan, Ni-W/Al₂O₃ has been developped for the hydrodenitrogenation of coal liquid. The purpose of this paper is to show the high performance of the developped catalyst and to estimate the catalyst life.
A continuos trickeled-bed microreactor was used in this work. The preliminary experiments showed that 1) the catalyst shoud be presulfided at the high temperature such as 400°C under a H₂S-H₂ stream, 2) the raw coal liquid should be distilled before hydrotreating because of the existence of sludge material, 3) the higher puressure of H₂ is preferable for deeper denitrogenation and longer catalyst life.
Based on the above information, the hydrotreatmnet of coal liquid (N; 5600wtppm) was carried out under 12MPa H₂ and H₂/oil ratio 1000 (L/L) for five months. It was supposed that the Ni-W/Al₂O₃ catalyst could reduce the nitrogen content from 5600ppm to 10ppm for about one year in the case of LHSV 1h^-1.