Pt–Sn alloy phases and coke mobility over Pt–Sn/Al2O3 and Pt–Sn/ZnAl2O4 catalysts for propane dehydrogenation

Applied Catalysis A: General, Volume 400, Issues 1-2, 30 June 2011, Pages 25-33
Pt–Sn alloy phases and coke mobility over Pt–Sn/Al2O3 and Pt–Sn/ZnAl2O4 catalysts for propane dehydrogenation
Bao Khanh Vu (a), Myoung Bok Song (a), In Young Ahn (b), Young-Woong Suh (b), Dong Jin Suh (b), Won-Il Kim (c), Hyoung-Lim Koh (c), Young Gyo Choi (c), Eun Woo Shin (a)
ewshin@mail.ulsan.ac.kr
a School of Chemical Engineering and Bioengineering, University of Ulsan, Daehakro 102, Nam-gu, Ulsan 680-749, South Korea
b Korea Institute of Science and Technology, Wolsong-gil 5, Seongbuk-gu, Seoul 136-791, South Korea
c R&DBusiness Lab., Hyosung Co., Hoge-dong, Dongan-ku, Anyang, Gyeounggi 431-080, South Korea
Abstract
Propane dehydrogenation on Pt–Sn/Al2O3 and Pt–Sn/ZnAl2O4 was performed.  The Pt–Sn/ZnAl2O4 catalyst showed a stronger tolerance for catalytic deactivation than the Pt–Sn/Al2O3 catalyst.
The study proposes that the high catalytic stability of Pt–Sn/ZnAl2O4 is due to the faster coke mobility from the metal surface to the support, proven by XPS measurement. XRD and HRTEM associated with EDX demonstrate that Pt–Sn alloy phases over the catalysts were transformed during the reaction.  In addition, bimetallic phase transition was different according to the supports. The different bimetallic alloy formations and phase transitions in the Pt–Sn catalysts cause different coke mobilities.

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