EFFECT OF COPPER LOADING ON PRODUCT SELECTIVITIES IN THE DEHYDROGENATION OF CYCLOHEXANOL OVER Cu/SiO<SUB>2</SUB> CATALYST

Jeon GS; Seo G; Chung JS

Korean Journal of Chemical Engineering, Vol.13, No.6, 642-646, November, 1996

EFFECT OF COPPER LOADING ON PRODUCT SELECTIVITIES IN THE DEHYDROGENATION OF CYCLOHEXANOL OVER Cu/SiO₂ CATALYST

Silica-supported copper catalysts were prepared by the ion-exchange method. Copper was loaded on silica as copper tetramine ion-exchanged to proton of silanol group and copper hydroxide entrapped in the fine pores of silica. Copper dispersion decreased with copper loading. The selectivity to cyclohexanone increased with copper loading, accompanying by decrease in the selectivity to cyclohexene. The selectivity to phenol increased sharply with high loading of copper. The decrease in the selectivity to cyclohexene with copper loading was interpreted by the masking of weak acid site, while the increase in the selectivity to phenol by existence of large particles to enhance multiple dehydrogenation of cyclohexane ring.

Keywords:Cu/SiO₂;Cyclohexanol Dehydrogenation;Ion-exchange Method;TEM;N₂O Titration

[References]

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[1] Chen WS, Lee MD, Lee JF, Appl. Catal. A: Gen., 83, 201 (1992)

[2] Chinchen GC, Hay CM, Vandervell HD, Waugh KC, J. Catal., 103, 79 (1987)

[3] Emelyanov NP, Belskaya RI, Semyachko RY, "Catalyst for Dehydrogenation of Cyclohexanol to Cyclohexanone," U.S. Patent, 3,652,460 (1972)

[4] Fridman VZ, Bedina LN, Petrov IY, Kinet. Katal., 29, 621 (1988)

[5] Jeon GS, Chung JS, Korean J. Chem. Eng., 12(1), 132 (1995)

[6] Jeon GS, Chung JS, Appl. Catal. A: Gen., 115(1), 29 (1994)

[7] Jeon GS, Seo G, Chung JS, HWAHAK KONGHAK, 34(5), 605 (1996)

[8] Jeon GS, Seo G, Chung JS, Korean J. Chem. Eng., 13(4), 412 (1996)

[9] Jeon GS, "The Dehydrogenation of Cyclohexanol over Copper-Supported Copper Catalysts," Ph.D. Dissertation, Pohang University of Science and Technology (1995)

[10] Klier K, Adv. Catal., 31, 243 (1982)

[11] Kobayashi H, Takezawa N, Minochi C, Takahashi K, Chem. Lett., 1197 (1980)

[12] Komarov VS, Bel'skaya RI, Skruko OF, Taboris-sakaya EA, "Catalyst for Dehydrogenation of Cyclohexanol to Cyclohexanone," U.S.S.R. Patent, 411 88 (1974)

[13] Lee JC, Trimm DL, Kohler MA, Wainwright MS, Cant NW, Catal. Today, 2, 643 (1988)

[14] Lin YM, Wang I, Yeh CT, Appl. Catal., 41, 53 (1988)

[15] Parks GA, Chem. Rev., 65, 177 (1965)

[16] Parris GE, Klier K, J. Catal., 97, 374 (1986)

[17] Richardson JT, "Principles of Catalyst Development," Plenum, New York (1989)

[18] Sivaraj C, Reddy BM, Rao PK, Appl. Catal., 45, L11 (1988)

[19] Sivaraj C, Srinvas ST, Rao VN, Rao PK, J. Mol. Catal., 60, L23 (1990)

[20] Wang I, Lin YM, "Method of Producing Cyclohexanone from Cyclohexanol through Oxidative Dehydrogenation," U.S. Patent, 4,198,239 (1990)