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Reaction Kinetics, Mechanisms and Catalysis
Authors: Cleanio L. Lima, Hélvio S. A. de Sousa, Santiago J. S. Vasconcelos, Josué M. Filho, Alcemira C. Oliveira, Francisco F. de Sousa, and Alcineia C. Oliveira

temperature programmed desorption of Pyridine (Py-TPD). 50 mg of each catalyst was pretreated at 150 °C under nitrogen flow for 1 h. Then Py was pulsed into the reactor at 250 °C under He flow until the acid sites were saturated. Finally, the physisorbed Py

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to TMS. Temperature-programmed-desorption (TPD) profiles of ammonia from the platinum catalysts were examined using a homemade TPD apparatus. A 0.1 g platinum catalyst was charged in a quartz tube with an O.D. = 1/4′ and then activated in an

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-IR, TG/DTA, ICP-AES, NH 3 -TPD and N 2 gas adsorption methods were used for the characterization of the zeolite samples. In order to determine the chemical composition of fresh and reused catalysts, zeolite samples were analyzed by ICP-AES (Perkin

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evidenced by O 2 -TPD. On the contrary, O 2 desorption from deactivated Cu/ZSM-5 (after reaction at 250 °C) occurred at around 330 °C according to O 2 -TPD results, and stable N 2 O decomposition activity could take place only above 350 °C. This is the

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thermogravimetric (TG) analyses were performed on a SETARAM Labsys instrument in the 30–900 °C temperature range, with a heating rate of 5 °C min −1 , under air flow. Temperature-programmed reduction (TPR) was performed using a TPD/R/O-1100 instrument

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out in a Micromeritics TPD/TPR 2900 apparatus. Kinetic measurements The substrate, m -dinitrobenzene, used in the present study was provided by Merck (>99%). Reactions were conduced in a in a batch reactor at a

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: 319 – 388 10.1081/CR-100101171 . 39. Ilieva , L , Andreeva , D , Andreev , A 1997 TPR and TPD investigation of Au/α-Fe 2 O 3 . Thermochim Acta 292 : 169 – 174 10.1016/S0040

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, Andreeva , D , Andreev , A 1977 TPR and TPD Investigation of Au/α-Fe 2 O 3 . Thermochim Acta 292 : 169 – 174 10.1016/S0040-6031(97)00018-X . 13. Munteanu , G , Ilieva , L , Andreeva

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