Low Temperature Oxidation of CO over Supported PdCl<SUB>2</SUB>-CuCl<SUB>2</SUB> Catalysts

Kon DJ; Song JH; Ham SW; Nam IS; Chang RW; Park ED; Lee JS; Kim YG

Korean Journal of Chemical Engineering, Vol.14, No.6, 486-490, November, 1997

Low Temperature Oxidation of CO over Supported PdCl₂-CuCl₂ Catalysts

Kon DJ, Song JH, Ham SW, Nam IS, Chang RW, Park ED, Lee JS, Kim YG

PdCl₂-CuCl₂ catalyst supported on activated carbon was examined for the low temperature oxidation of CO. The catalyst developed in the present study was active and stable at ambient conditions if water were existing in the feed gas stream. The addition of Cu(NO₃)₂ into the PdCl₂-CuCl₂ catalyst significantly enhanced the CO oxidation activity. X-ray diffraction study revealed that the role of Cu(NO₃)₂ was to stabilize active Cu(Ⅱ) species, Cu₂Cl(OH)₃, on the catalyst surface which maintains the redox property of palladium. When HCl and SO₂ were also existing in the feed, they easily inactivated the catalyst. It was found that HCl and SO₂ inhibited the formation of active Cu(Ⅱ) species on the catalyst surface.

Keywords:Carbon Monoxide Oxidation;Low Temperature Oxidation;Supported PdCl₂-CuCl₂;Wacker-type Catalysts

[References]

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[1] Boulahouche A, Kons G, Lintz HG, Schulz P, Appl. Catal. A: Gen., 91, 115 (1992)

[2] Brittan MI, Bliss H, Walker CA, AIChE J., 16, 305 (1970)

[3] Choi KI, Vannice MA, J. Catal., 127, 465 (1991)

[4] Desai MN, Butt JB, Dranoff JS, J. Catal., 79, 95 (1983)

[5] Fuller MJ, Warwick ME, J. Chem. Soc.-Chem. Commun., 210 (1973)

[6] Haruta M, Tsubota S, Kobayashi T, Kageyama H, Genet MJ, Delmon B, J. Catal., 144, 175 (1993)

[7] Imamura S, Tsuji Y, Miyake Y, Ito T, J. Catal., 151(2), 279 (1995)

[8] Lee CW, Park SJ, Kim YS, Chong PJ, Bull. Korean Chem. Soc., 16(3), 296 (1995)

[9] Lee JS, Choi SH, Kim KD, Nomura M, Appl. Catal. B: Environ., 7(3-4), 199 (1996)

[10] Lloyd WG, Rowe DR, Environ. Sci. Technol., 5(11), 1133 (1971)

[11] Lloyd WG, Rowe DR, "Palladium Compositions Suitable as Oxidation Catalysts," U.S. Patent, 3,790,662 (1974)

[12] Kim KD, Nam IS, Chung JS, Lee JS, Ryu SG, Yang YS, Appl. Catal. B: Environ., 5(1-2), 103 (1994)

[13] Oh SH, Eickel CC, J. Catal., 128, 526 (1991)

[14] Tanielyan SK, Augustine RL, Appl. Catal. A: Gen., 85, 73 (1992)

[15] Yao YY, J. Catal., 87, 152 (1984)

[16] Yaparpalvi R, Chuang KT, Ind. Eng. Chem. Res., 30, 2219 (1991)