Deactivation of a Presulfided Ni-W/Al2O3 Catalyst for Upgrading of Coal-derived Liquid
2004 Volume 83 Issue 3 Pages 194-198
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2004 Volume 83 Issue 3 Pages 194-198
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.
