J. Gestel, J. Leglise, J. Duchet
Dec 16, 1992
Citations
0
Influential Citations
26
Citations
Journal
Applied Catalysis A-general
Abstract
Abstract The reaction of 2,6-dimethylaniline was studied between 280°C and 320°C at 4 MPa on CoMo and NiMo/Al 2 O 3 hydrotreating catalysts. The formation of dimethylcyclohexanes and dimethylcyclohexenes, of m -xylene and of o -toluidine plus mesidine gave access to three functionalities of the catalysts: hydrogenation, C-N bond cleavage and acidity. The influence of H 2 S on the activity and the selectivity of the catalysts was examined for H 2 S/H 2 molar ratios ranging from 0 to 0.07. The response of hydrogenation and of hydrogenolysis to H 2 S were similar: activity of both functions decreased up to about 1 % H 2 S, and stayed constant beyond that value, while the acidity continuously increased with the H 2 S concentration. From these results, the distribution of active species originating from H 2 and H 2 S is discussed in relation with the reaction mechanism.