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Received July 16, 2002
Accepted September 24, 2002
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Infrared and Raman Characterization of V2O5 on Zirconia Modified with WO3 and Activity for Acid Catalysis
Dept. of Industrial Chemistry, Engineering College, Kyungpook National University, Daegu 702-701, Korea 1Dept. of Industrial Chemisry, Kyungil University, Kyungsan 712-701, Korea 2Dept. of Chemistry, University of Ulsan, Ulsan 680-749, Korea
jrsohn@knu.ac.kr
Korean Journal of Chemical Engineering, January 2003, 20(1), 48-57(10), 10.1007/BF02697184
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Abstract
Vanadium oxide supported on zirconia modified with WO3 was prepared by adding Zr(OH)4 powder into a mixed aqueous solution of ammonium metavanadate and ammonium metatungstate followed by drying and calcining at high temperatures. The characterization of prepared catalysts was performed by using FTIR, Raman, and XRD. In the case of calcination temperature at 773 K, for samples containing low loading V2O5 below 18 wt%, vanadium oxide_x000D_
was in a highly dispersed state, while for samples containing high loading V2O5 equal to or above 18 wt%, vanadium oxide was well crystallized due to the high V2O5 loading on the surface of ZrO2. The ZrV2O7 compound was formed through the reaction of V2O5 and ZrO2 at 873 K, and the compound decomposed into V2O5 and ZrO2 at 1,073 K, these results were confirmed by FTIR and XRD. Catalytic tests for 2-propanol dehydration and cumene dealkylation have shown that the addition of WO3 to V2O5/ZrO2 enhanced both catalytic activity and acidity of V2O5-WO3/ZrO2 catalysts. The variations in catalytic activities for both reactions are roughly correlated with the changes of acidity.
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Bjorklund RB, Odenbrand CUI, Brandin JGM, Anderson LAH, Liedberg B, J. Catal., 119, 187 (1989)
Busca G, Elmi AS, Forzatti P, J. Phys. Chem., 91, 5263 (1987)
Cavani F, Centi G, ForestiE, Trifiro F, J. Chem. Soc.-Faraday Trans., 84, 237 (1988)
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Elmi AS, Tronoconi E, Cristiani C, Martin JPG, Forzatti P, Ind. Eng. Chem. Res., 28, 387 (1989)
Engweiler J, Harf J, Baiker A, J. Catal., 159(2), 259 (1996)
Gutierrez-Alejandre A, Ramirez J, Busca G, Langmuir, 14(3), 630 (1998)
Hatayama F, Ohno T, Maruoka T, Miyata H, J. Chem. Soc.-Faraday Trans., 87, 2629 (1991)
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Kustov LM, Kazansky VB, Figueras F, Tichit D, J. Catal., 150(1), 143 (1994)
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Miyata H, Kohno M, Ono T, Ohno T, Hatayama F, J. Chem. Soc.-Faraday Trans., 85, 3663 (1989)
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Mori K, Miyamoto A, Murakami Y, J. Chem. Soc.-Faraday Trans., 83, 3303 (1987)
Paganini MC, Dallacqua L, Giamello E, Lietti L, Forzatti P, Busca G, J. Catal., 166(2), 195 (1997)
Park EH, Lee MH, Sohn JR, Bull. Korean Chem. Soc., 21, 913 (2000)
Ramis G, Cristiani C, Forzatti P, Busca G, J. Catal., 124, 574 (1990)
Roozeboom F, Mittelmelijer-Hazeleger MC, Moulijn JA, Medema J, deBeer UHJ, Gelling PJ, J. Phys. Chem., 84, 2783 (1980)
Sachtler WMH, Catal. Rev.-Sci. Eng., 4, 27 (1971)
Salvati L, Makovsky LE, Stencel JM, Brown FR, Hercules DM, J. Phys. Chem., 85, 3700 (1981)
Scharf U, SchramlMarth M, Wokaun A, Baiker A, J. Chem. Soc.-Faraday Trans., 87, 3299 (1991)
Scheithauer M, Grasselli RK, Knozinger H, Langmuir, 14(11), 3019 (1998)
Schild CH, Wokaun A, Koppel RA, Baiker A, J. Catal., 130, 657 (1991)
Sohn JR, Bae JH, Korean J. Chem. Eng., 17(1), 86 (2000)
Sohn JR, Cho SG, Pae YI, Hayashi S, J. Catal., 159(1), 170 (1996)
Sohn JR, Kim JG, Kwon TD, Park EH, Langmuir, 18(5), 1666 (2002)
Sohn JR, Park MY, Langmuir, 14(21), 6140 (1998)
Sohn JR, Park MY, Pae YI, Bull. Korean Chem. Soc., 17, 274 (1996)
Sohn JR, Park WC, Korean J. Chem. Eng., 19(4), 580 (2002)
Toda Y, Ohno T, Hatayama F, Miyata H, Phys. Chem. Chem. Phys., 1, 1615 (1999)
Vaudagna SR, Canavese SA, Comelli RA, Figoli NS, Appl. Catal. A: Gen., 168(1), 93 (1998)
Vaudagna SR, Comelli RA, Canavese SA, Figoli NS, J. Catal., 169(1), 389 (1997)
Vuurman MA, Wachs IE, Hirt AM, J. Phys. Chem., 95, 9928 (1991)
Wan KT, Khouw CB, Davis ME, J. Catal., 158(1), 311 (1996)
Ward DA, Ko EI, J. Catal., 150(1), 18 (1994)
Yuan XD, Park JN, Wang J, Lee CW, Park SE, Korean J. Chem. Eng., 19(4), 607 (2002)
Zhao B, Xu X, Gao J, Fu Q, Tang Y, J. Raman Spectrosc., 27, 549 (1996)
