Abstract

Basic and non-basic polynuclear nitrogen compounds susceptible to hydrodenitrogenation (HDN) have been studied in the HDN reaction of a mixture of carbazole and acridine on a reduced MoO 3 Al 2O 3 catalyst. Experiments were carried out in a flow microreactor at 260 to 360 °C and 4.5, 9.0 and 12.5 MPa hydrogen pressure. The conversion of acridine in the HDN reaction was 100% at 280 °C and 10.1 MPa total pressure, but the denitrogenated compounds were barely observed. In contrast, more denitrogenated compounds from the carbazole HDN were formed as compared with the acridine denitrogenated compounds at 280 °C, but carbazole still remained even at 340 °C. This showed that nitrogen-type compounds have different reactivities toward HDN. The denitrogenation rate of a basic nitrogen compound is faster than that of a non-basic one at either high temperature or low hydrogen pressure, but a non-basic nitrogen compound is reduced more effectively at both low temperature and high pressure.

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