Electronic density enrichment of Pt catalysts by coke in the propane dehydrogenation

Bao Khanh Vu; Myoung Bok Song; Sul-A Park; Youngil Lee; In Young Ahn; Young-Woong Suh; Dong Jin Suh; Won-Il Kim; Hyoung-Lim Koh; Young Gyo Choi; Eun Woo Shin

Korean Journal of Chemical Engineering, Vol.28, No.2, 383-387, February, 2011

DOI10.1007/s11814-010-0363-8 Export Citation

Electronic density enrichment of Pt catalysts by coke in the propane dehydrogenation

Bao Khanh Vu, Myoung Bok Song, Sul-A Park¹, Youngil Lee¹, In Young Ahn², Young-Woong Suh², Dong Jin Suh², Won-Il Kim³, Hyoung-Lim Koh³, Young Gyo Choi³, and Eun Woo Shin^†

School of Chemical Engineering and Bioengineering, University of Ulsan, Daehakro 102, Nam-gu, Ulsan 680-749, Korea
¹Department of Chemistry, University of Ulsan, Daehakro 102, Nam-gu, Ulsan 680-749, Korea
²Korea Institute of Science and Technology, Wolsong-gil 5, Seongbuk-gu, Seoul 136-791, Korea
³R&D Business Labs, Hyosung Co, Hoge-dong, Dongan-gu, Anyang, Gyeounggi 431-080, Korea

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We investigated the nature of coke generated in propane dehydrogenation over supported Pt catalysts by FTIR, NMR, and XPS. NMR and FTIR spectra proved that the coke produced in the reaction contained poly-aromatic rings, which was consistent with the previous result that pregraphite-like coke structure was formed. The XPS results indicated that the coke deposits consisted of sp2 hybridized carbon. All of the characterizations indicated that the pregraphite- like coke containing the poly-aromatic ring structure was generated over the catalysts during the propane dehydrogenation. Furthermore, the XPS measurement demonstrated that the coke deposits interacted with Pt and the electron density of Pt was enriched through the interaction.

Keywords:Electronic Density;Propane Dehydrogenation;Coke Deposition;Supported Pt Catalysts;Deactivation

[References]

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Paal Z, Schlogl R, Ertl G, Catal. Lett., 12, 331 (1992)
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Weckhuysen BM, Rosynek MP, Lunsford JH, Catal. Lett., 52(1-2), 31 (1998)
Resasco DE, Marcus BK, Huang CS, Durante VA, J. Catal., 146(1), 40 (1994)
de Vekki A, Kraev Y, Solovykh A, Pet. Chem., 48, 210 (2008)
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[18] Breitmaier E, Voelter W, Carbon-13 Nmr spectroscopy: Highresolution methods and applications in organic chemistry and biochemistry, Gordon & Breach Science Pub., New York (1987)

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[21] Mayo DW, Miller FA, Hannah RW, Course notes on the interpretation of infrared and raman spectra, Wiley-Interscience, New Jersey (2004)

[22] Desimoni E, Casella GI, Morone A, Salvi AM, Surf. Interf.Anal., 15, 627 (1990)

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