naa a22 4500 510819087 CHVBK 20180411083522.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11814-012-0095-z doi (NATIONALLICENCE)springer-10.1007/s11814-012-0095-z Modeling of Pt-Sn/ γ -Al2O3 deactivation in propane dehydrogenation with oxygenated additives [Elektronische Daten] [Abolfazl Samavati, Moslem Fattahi, Farhad Khorasheh] A reduction in catalyst activity with time-on-stream and formation of side products are the major problems associated with catalytic propane dehydrogenation. Coke formation on the catalyst surface is the most important cause for catalyst deactivation. Experiments have indicated that the presence of very small amounts of oxygenated additives such as water can reduce the amount of coke accumulated on the catalyst surface and enhance catalyst activity. Addition of water beyond an optimum level, however, would result in a loss of activity due to sintering of catalyst. Propane dehydrogenation over a Pt-Sn/γ-Al2O3 catalyst in the temperature range of 575 to 620 °C was investigated in the presence of small amounts of water added to the feed. A monolayer-multilayer mechanism was used to model the coke growth kinetics. Coke deposition and catalyst sintering were considered in a catalyst deactivation model to explain the observed optimum level in the amounts of water added to the feed. The model predictions for both propane conversion and coke formation with time-on-stream were in good agreement with experimental data. Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Propane Dehydrogenation nationallicence Coke Formation nationallicence Deactivation nationallicence Oxygenated Additives nationallicence Side Reactions nationallicence Samavati Abolfazl Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box, 11365-9465, Tehran, Iran aut Fattahi Moslem Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box, 11365-9465, Tehran, Iran aut Khorasheh Farhad Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box, 11365-9465, Tehran, Iran aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 55-61 0256-1115 30:1<55 2013 30 11814 https://doi.org/10.1007/s11814-012-0095-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0095-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Samavati Abolfazl Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box, 11365-9465, Tehran, Iran aut NATIONALLICENCE 700 1- Fattahi Moslem Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box, 11365-9465, Tehran, Iran aut NATIONALLICENCE 700 1- Khorasheh Farhad Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box, 11365-9465, Tehran, Iran aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 55-61 0256-1115 30:1<55 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer