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Deactivation of the Metal and Acidic Functions for Pt, Pt-Sn and Pt-Sn-K Using Physically Mixed Catalysts
Department of Chemical Engineering, Chulalongkorn University, Bangkok, 10330, Thailand
sunee11@hotmail.com
Korean Journal of Chemical Engineering, September 2000, 17(5), 548-552(5), 10.1007/BF02707164
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Abstract
The effect of K addition on the amount and dispersion of carbon deposition on metal sites and support sites was investigated on a physical mixture for hexane dehydrogenation. TPO, BET and ESR experiments were used for characterization. The K addition significantly decreases catalyst deactivation involving the amount of coke deposits and the density of carbon radicals on the metal and support sites because of ensemble and electronic effects, especially on the metal sites. Coke on the metal sites associated with carbonaceous species rich in hydrogen is less polymerized than coke on the support sites. corresponding to a more graphitic-like carbon.
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References
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Kirszensztejn P, Foltynowicz Z, Wachowski L, Ind. Eng. Chem. Res., 30, 2276 (1991)
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Tao Z, Jingling Z, Liwu L, Catal. Deactivation, 143 (1991)
Trimm DL, Appl. Catal., 5, 263 (1983)
Trimm DL, Catal. Today, 49(1-3), 3 (1999)
Warlz JE, Bolton JR, "Electron Spin Resonance: Elementary Theory and Practical Applications," Chapman and Hall Ltd., New York (1972)
