Abstract
The reaction of 2,6-dimethylaniline was studied between 280°C and 320°C at 4 MPa on CoMo and NiMo/Al 2O 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 2S on the activity and the selectivity of the catalysts was examined for H 2S/H 2 molar ratios ranging from 0 to 0.07. The response of hydrogenation and of hydrogenolysis to H 2S were similar: activity of both functions decreased up to about 1 % H 2S, and stayed constant beyond that value, while the acidity continuously increased with the H 2S concentration. From these results, the distribution of active species originating from H 2 and H 2S is discussed in relation with the reaction mechanism.
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