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8538976 
Journal Article 
Hydrocracking of Yubari Residual Coal Treated with Chromic Anhydride 
Furukawa, S; Suzuki, Y 
1993 
72 
10 
1022-1026 
English 
Coal easily reacted with CrO3in aqueous solution, while CrO3was reduced to Cr2O3at the temperature of coal pyrolysis. In hydrocracking of coal treated with CrO3, coal was hydrocracked to more liquefied products under reducing temperature from CrO3to Cr2O3. In present report, hydrocracking of Yubari residue treated with CrO3was carried out from repetition to repetition at the same conditions, and the activity of chromium oxide catalyst formed by the reduction of CrO3was estimated. HS (hexane soluble fraction) yield linearly increased up to four times and then slowly increased continuously with increasing number of reaction. Especially, BS (hexane insoluble-benzene soluble fraction) linearly increased with more number of reaction. Not a large difference was observed in the average structures of liquefied products from parent coal and CrO3treated coal, while 1H-NMR spectra of HS were largely affected by the number of reaction. These results indicated that activity of chromium oxide catalyst was kept constant during of 1-8th reactions. © 1993, The Japan Institute of Energy. All rights reserved. 
Chromium oxide catalyst; CrO3treated coal; Hydrocracking; Repeat reactions; Yubari residual coal