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The kinetics of the hydrogenolysis of benzothiophene on a commercial CoMoly-Al,O, catalyst were studied in a tubular reactor. A sequential design of the experimental program was used for both the model discrimination and precise parameter estimation. Model selection was effectively achieved among 16 rival sets of rate equations of the Hougen-Watson type for both the hydrogenolysis of benzothiophene into ethylbenzene and the hydrogenation of benzothiophene into dihydrobenzothiophene with subsequent hydrogenolysis into ethylbenzene. The procedure was carried out at 513, 533, 553, and 573 K. The concerted surface reaction between benzothiophene or dihydrobenzothiiphene and two competitively adsorbed hydrogen atoms was found to be the ratedetermining step, a conclusion close to that arrived at in the study of thiophene hydrogenolysis.

Gas chromatographM. Gas meter tionary phase. The carrier gas was hydrogen, so that only hydrocarbons were detected.The catalyst contained 0.7 wt % Pt on A1203 and 0.85 wt % chlorine. The density was 0.52 gram per cc, and the internal surface area, 190 m2 per gram. The particles were spherical with diameter between 1 and 2 mm. The catalyst was very sensitive to trace impurities leading to deactivation. Consequently, the catalyst activity was frequently checked by means of a standard test.Kinetic experiments were conducted at 7, 11, 16, and 21 atm absolute and temperatures of 375°, 389°, 400°, 410°, and 425°C. The molar ratio, hydrogen/n-pentane, was varied from 2 to 10.To study the effect of chlorine concentration on the

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