TPR STUDY ON DIFFERENTLY PREPARED COPPER MORDENITES

Kim MS; Lee CY; Ha BH

Korean Journal of Chemical Engineering, Vol.9, No.2, 53-59, April, 1992

There kinds of copper mordenite such as copper ion-exchanged, impregnated and physically mixed hydrogen mordenites were prepared and TPR study was carried out. For the fresh ion-exchanged mordenite, two distinct reduction processes were observed; one for the reduction of Cu(II)ion to Cu(I) ion at 225℃ and the other for the reduction of Cu(I) to copper metal at 480℃, respectively. Successive TPR/oxygen-treatment lowered the first reduction temperature to 200℃ and raised the hydrogen consumption. However, the second peak at 480℃ for Cu(I) to copper metal was diminished. The reduction peak at 200℃ may be an indicative of the newly formed ionic com-pounds such as cluster of copper ions. Impregnation of cupric salts leads to the formation of similar cluster of copper ions as those appeared in ion-exchanged mordenite. The treatments of CuO-mixed mordenite also decreased the reduction temperature due to the well dispersed CuO particles on the crystal surface and also formed the same cluster copper ions as appeared in the ion-exchanged one. The cluster of copper ions on the crystal surface created the higher activity for CO oxidation.

[References]

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Kucherov AV, Slinkin AA, Zeolites, 6, 175 (1986)
Miro EF, Lombardo EA, Petunchi J, J. Catal., 104, 176 (1987)
Lee CY, Choi KY, Ha BH, HWAHAK KONGHAK, 26(4), 404 (1988)
Lee CY, Choi KY, Ha BH, to be published
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[1] Turkevich J, Ono Y, Soria J, J. Catal., 25, 40 (1972)

[2] Herman RG, Lunsford JH, Beyer HK, Jacobs PA, Uytterhoeven JB, J. Phys. Chem., 79, 2388 (1975)

[3] Flenge DR, Lunsford JH, Jacobs PA, Uytterhoeven JB, J. Phys. Chem., 75, 354 (1975)

[4] Jacobs PA, DeWilder W, Schoonheydt RA, Uytterhoeven JB, J. Chem. Soc.-Faraday Trans., 72, 1221 (1976)

[5] Jacobs PA, Beyer HK, J. Phys. Chem., 83, 1174 (1979)

[6] Jacobs PA, Linart JP, Nijs H, Uytterhoeven JB, J. Chem. Soc.-Faraday Trans., 73, 1745 (1977)

[7] Gentry SJ, Hurst NW, Jones A, J. Chem. Soc.-Faraday Trans., 75, 1688 (1979)

[8] Iwamoto M, Ohura S, Kagawa S, J. Chem. Soc.-Chem. Commun., 842 (1981)

[9] Iwamoto M, Nagano H, Furukawa H, Kagawa S, J. Chem. Soc.-Chem. Commun., 471 (1983)

[10] Iwamoto M, Ohura S, Kagawa S, Shokubai, 25, 368 (1983)

[11] Kucherov AV, Slinkin AA, Kondrutev DA, Bondarenko TN, Minachev M, Zeolites, 5, 320 (1985)

[12] Kucherov AV, Slinkin AA, Zeolites, 6, 175 (1986)

[13] Miro EF, Lombardo EA, Petunchi J, J. Catal., 104, 176 (1987)

[14] Lee CY, Choi KY, Ha BH, HWAHAK KONGHAK, 26(4), 404 (1988)

[15] Lee CY, Choi KY, Ha BH, to be published

[16] Hong FC, Fung HH, J. Catal., 77, 561 (1982)

[17] Iwamoto M, Furukawa H, Kagawa S, "Proceedings of 7th International Zeolite Conference," p. 943, Elsevier, Tokyo (1986)