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8685625 
Journal Article 
Poisoning of a platinum catalyst by thiophene under reforming conditions - Communication 3. Effect of temperature and pressure of hydrogen 
Minachev, KM; Kondrat'Ev, DA; Shchukina, OK 
1960 
1 
Bulletin of the Academy of Sciences of the USSR. Division of Chemical Science
ISSN: 0568-5230 
9 
7 
1171-1174 
English 
1. An investigation was made of the deactivation of 1% Pt-Al2O3 as a function of temperature (425-500°) at a constant hydrogen pressure of 20 atm and as a function of pressure (10-40 atm) at 450° and 475° in the course of the dehydrogenation of cyclohexane containing 2.65% of thiophene. 2. The extent of the dehydrogenation of cyclohexane at pressures of 20, 30, and 40 atm and at various temperatures (425°, 450°, 475°, and 500°) becomes stabilized after 1-2 hours. However, at a pressure of 10 atm at 450° and 475° no stabilization of the extent of dehydrogenation is observed and the activity of the catalyst gradually falls over a period of 20 hours. 3. The stabilized extent of dehydrogenation of cyclohexane increases with rise in temperature (from 425° to 500°) and diminishes with increase in pressure (from 20 to 40 atm). 4. The specific surfaces of deactivated catalysts fall with rise in temperature, but are scarcely changed by change in pressure. 1961 Consultants Bureau Enterprises Inc.