Collect. Czech. Chem. Commun. 1983, 48, 3413-3420

Formation of sulphur compounds in the hydrodenitrogenation of 2-methylquinoline, 2-methylpiperidine, indole, and isoquinoline on a nickel-tungsten catalyst in the presence of hydrogen sulphide

Mirko Černýa and Antonín Trkab

a Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol
b Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6


2-Methylquinoline, 2-methylpiperidine, indole, and isoquinoline were subjected to hydrodenitrogenation (HDN) on a sulphidized nickel-tungsten catalyst in an autoclave at 300 and 350 °C using pure hydrogen or a hydrogen-hydrogen sulphide mixture. The neutral fraction from the HDN of 2-methylquinoline and 2-methylpiperidine contained 40 and 90% sulphur compounds, respectively. The presence of hydrogen sulphide in the HDN of isoquinoline resulted in an enhanced fraction of the neutral moiety. A reaction mechanism is suggested for the HDN of 2-methylquinoline and 2-methylpiperidine in the presence of hydrogen sulphide, in which the latter contributes to the higher degree of conversion due to the formation of corresponding sulphur compounds.