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8702780 
Journal Article 
Poisoning of a platinum catalyst with thiophene under reforming conditions - Communication 2. Use of thiophene containing the radioactive isotope S35 
Minachev, KM; Isagulyants, GV; Kondrat'Ev, DA 
1960 
1 
Bulletin of the Academy of Sciences of the USSR. Division of Chemical Science
ISSN: 0568-5230 
9 
5 
839-843 
English 
1. An investigation was made of the poisoning of a platinized alumina catalyst (5% Pt) with thiophene labeled with radiosulfur under the conditions for the dehydrogenation of cyclohexane in a flow system at 450° and 20 atm. 2. The general laws relating the poisoning of this catalyst to time and to the thiophene content of the mixture are similar to those found earlier for a catalyst containing 1% of platinum. 3. The use of radiosulfur made it possible for the first time to determine the sulfur content of the catalyst; this varied from 0.063% to 0.14% accord ing to the thiophene content of the original mixture, which corresponds to a change in the Pt: S atomic ratio from 13 to 5.6. 4. The relation of the sulfur content of the catalyst to its activity is linear. 5. Regeneration is accompanied by the removal of sulfur from the catalyst, but the activity is already completely regained at a point at which the catalyst still contains about 40%, of the sulfur present before regeneration. 1961 Consultants Bureau Enterprises, Inc.