Probability of Chain Growth in Coke Formation on Metals and on Supports during Catalytic Reforming over Pt, Pt-Sn and Pt-Sn-K Catalysts Mixed Physically with Al<sub>2</sub>O<sub>3</sub>

Sunee Srihiranpullop; Piyasan Praserthdam

Korean Journal of Chemical Engineering, Vol.20, No.6, 1017-1022, November, 2003

Probability of Chain Growth in Coke Formation on Metals and on Supports during Catalytic Reforming over Pt, Pt-Sn and Pt-Sn-K Catalysts Mixed Physically with Al₂O₃

Sunee Srihiranpullop^†, and Piyasan Praserthdam¹

Twinning Engineering Programmes, Faculty of Engineering, Thammasart University (Rangsit Campus), Khlong Luang, Pathumtani 12121, Thailand
¹Center of Excellence on Catalysis and Catalytic Reaction Engineering,Department of Chemical Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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The main goal of this contribution was to study the probability of chain growth of coke on metal sites and on support sites for hexane dehydrogenation. The coke structure of the catalysts examined by IR was found to have the aromatic structure. Soxhlet extraction coupled with GC-14B (DB1 column) analysis was mainly employed for coke composition analysis and determination of the probability of chain growth (alpha value). It was found that the soluble coke was mainly composed of C₈-C₁₂ on both sites. Interestingly, the probabilities of chain growth on both sites were identical. However, the extracted coke on the metal site was more easily removable and had lower carbon numbers than that on the support site. Moreover, the addition of promoter, especially of K promoter, was sensitive to inhibit the probability of chain growth, resulting in the reduction of the amount of coke.

Keywords:Probability of Chain Growth;Coke;Physically Mixed Catalyst;Promoter with Sn and K

[References]

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[Referenced By]

[1] Barbier J, Catal. Deactivation, 1 (1987)

[2] Biswas J, Bickle GM, Gray PG, Catal. Rev.-Sci. Eng., 30, 161 (1988)

[3] Biswas J. Gray PG, Do DD, Appl. Catal., 32, 249 (1987)

[4] Bond GC, "Heterogeneous Catalysis: Principles and Application," Clarendon Press: Oxford (1987)

[5] Figoli NS, Beltramini JN, Martinelli EE, Dad MR, Parera JM, Appl. Catal., 5, 19 (1983)

[6] Flory PJ, "Principle of Polymer Chemistry," Cornell University Press, New York, 317 (1953)

[7] Forzatti P, Lietti L, Catal. Today, 52(2-3), 165 (1999)

[8] Froment GF, Catal. Deactivation, 53 (1997)

[9] Froment GF, Catal. Deactivation, 53 (1991)

[10] Van der Laan GP, Beenackers AACM, Catal. Rev.-Sci. Eng., 41(3-4), 255 (1999)

[11] Hamada H, Catal. Surveys Jpn., 1, 53 (1997)

[12] Inaba M, Kintaichi Y, Hamada H, Catal. Lett., 36(3-4), 223 (1996)

[13] Lamy-Pitara E, Ouazzani-Benhima H, Barbier J, Cahoreau M, Caisso J, Appl. Catal. A: Gen., 81, 47 (1992)

[14] Lietz G, Volter J, Dobrovolszky M, Paal Z, Appl. Catal., 13, 77 (1984)

[15] Lox ES, Froment GF, Ind. Eng. Chem. Res., 32, 71 (1993)

[16] Pieck CL, Verderone RJ, Jablonski EL, Parera JM, Appl. Catal., 55, 1 (1989)

[17] Radwan AM, Kyotani T, Tomita A, Appl. Catal. A: Gen., 192(1), 43 (2000)

[18] Reyniers GC, Froment GF, Kopinke FD, Zimmermann G, Ind. Eng. Chem. Res., 33(11), 2584 (1994)

[19] Rostrup-Nielsen JR, "Catalytic Steam Reforming," Berlin: Buchbinderei Bruno Helm (1984)

[20] Rostrupnielsen JR, Catal. Today, 37(3), 225 (1997)

[21] Srihiranpullop S, Praserthdam P, Mongkhonsi T, Korean J. Chem. Eng., 17(5), 548 (2000)

[22] Sunee S, Piyasan P, Tharathon M, React. Kinet. Catal. Lett., 72, 125 (2001)

[23] Trimm DL, Appl. Catal., 5, 263 (1983)

[24] Trimm DL, Catal. Today, 37(3), 233 (1997)

[25] VanTrimpont PA, Marin GB, Froment GF, Appl. Catal., 24, 53 (1986)

[26] Vertes C, Talas E, Czako-Nagy I, Ryczkowski J, Gobolos S, Vetes A, Margitfalvi J, Appl. Catal., 68, 149 (1991)