V2O5-TiO2 및 황산으로 개질된 V2O5-TiO2의 특성

배영일; 도임자; 박은희; 손종락

Journal of the Korean Industrial and Engineering Chemistry, Vol.6, No.5, 849-858, October, 1995

Export Citation

V₂O₅-TiO₂ 및 황산으로 개질된 V₂O₅-TiO₂의 특성

Characterization of V₂O₅-TiO₂ and V₂O₅-TiO₂ Catalysts Modified with H₂SO₄

배영일, 도임자, 박은희, 손종락

초록

Ti(OH)₄ 분말을 NH₄VO₃ 수용액에 함침시킨 후 공기중에 소성하여 V₂O₅-TiO₂ 촉매를 제조하였으며 또한 NH₄VO₃로 함침된 Ti(OH)₄ 분말을 황산으로 개질한 후 소성하여 V₂O₅-TiO₂/SO₄^2- 촉매를 제조하였다. 제조된 촉매의 특성을 FTIR, DSC-TGA, XRD 및 표면적 측정에 의하여 연구하였다. V₂O₅-TiO₂표면에 결합된 황산기는 V₂O₅함량이 많을 수록 낮은 온도에서 분해되었다. 그리고 V₂O₅함량이 8∼10mo1%까지는 V₂O₅가 TiO₂ 표면에 잘 분산되어 900℃의 소성온도에서도 V₂O₅의 결정이 XRD pattern상에 나타나지 아니하였으나 V₂O₅.함량이 10mo1% 및 그 이상에서는 400℃의 소성 온도부터 V₂O₅ 결정이 나타났다. IR과 XRD의 결과를 근거로 하면 TiO₂표면을 monolayer로 완전히 입히는 데 필요한 V₂O₅의 함량은 8∼10mo1%임을 추측할 수 있다.

V₂O₅-TiO₂ catalysts were prepared by dry impregnation of powdered Ti(OH)₄ with an aqueous solution of NH₄VO₃ followed by calcining in air, and V₂O₅-TiO₂/SO₄^2- catalysts were prepared by modifying impregnated Ti(OH)₄ with H₂SO₄ followed by calcining in air. The characterization of prepared catalysts was performed by using FTIR, DSCTGA, and XRD, and by the measurement of surface area. The higher the content of V₂O₅, the lower the decomposition temperature of sulate bonded to the TiO₂-V₂O₅ surface. Since V₂O₅ was dispersed on the surface of TiO₂ up to 8mol% of V₂O₅, any crystal phase of V₂O₅ even at the calcination temperature of 900℃ was not observed on the XRD patterns. However, in the case of sample containing 10mo1 % and more than 10mo1% of V₂O₅ ,V₂O₅ crystal phase appeared on XRD pattern from the calcination temperature of 400℃. On the basis of results of IR and XRD, it is guessed that the cgntent of V₂O₅ monolayer covering most of the available TiO₂ is 8∼10mo1%.

[References]

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[Referenced By]

[1] Wainwright MS, Foster NR, Catal. Rev.-Sci. Eng., 19, 211 (1979)

[2] Dadyburjor DB, Jewur SS, Ruckenctein E, Catal. Rev.-Sci. Eng., 19, 293 (1979)

[3] Nakagawa Y, Ono T, Miyata H, Kubokawa Y, J. Chem. Soc.-Faraday Trans., 79, 2929 (1983)

[4] Miyata H, Kohno M, Ono T, Ohno T, Hatayama F, J. Chem. Soc.-Faraday Trans., 85, 3663 (1989)

[5] Gellings PJ, Spec. Per. Rep. "Catalysis," (G.C. Bond and G. Webb, Eds.) 7, 105, Royal Society of Chemistry, London (1985)

[6] Bosch H, Janssen F, Catal. Today, 2, 369 (1988)

[7] Forzatti P, Tronconi E, Busca G, Titarelli P, Catal. Today, 1, 209 (1987)

[8] Busca G, Elmi AS, Forzatti P, J. Phys. Chem., 91, 5263 (1987)

[9] Elmi AS, Tronconi E, Cristiani C, Martin JPG, Forzatti P, Ind. Eng. Chem. Res., 28, 387 (1989)

[10] Miyata H, Fujii K, Ono T, Kubokawa Y, Ohno T, Hatayama F, J. Chem. Soc.-Faraday Trans., 83, 675 (1987)

[11] Cavani F, Centi G, Foresti E, Trifiro JF, J. Chem. Soc.-Faraday Trans., 84, 237 (1988)

[12] Hatayama F, Ohno T, Maruoka T, Ono T, Miyata H, J. Chem. Soc.-Faraday Trans., 87, 2629 (1991)

[13] Ai M, J. Catal., 54, 426 (1979)

[14] Kurosaki A, Okazaki S, Nippon Kagaku Kaishi, 1816 (1976)

[15] Hino M, Arata K, Chem. Lett., 477 (1979)

[16] Hino M, Arata K, Chem. Lett., 1259 (1979)

[17] Hino M, Arata K, Chem. Lett., 1479 (1979)

[18] Wang GW, Hattori H, Tanabe K, Chem. Lett., 277 (1983)

[19] Hino M, Arata K, Chem. Lett., 1483 (1979)

[20] Hino M, Arata K, J. Chem. Soc.-Chem. Commun., 851 (1980)

[21] Hino M, Arata K, J. Chem. Soc.-Chem. Commun., 1148 (1979)

[22] Hino M, Arata K, J. Chem. Soc.-Chem. Commun., 112 (1979)

[23] Hino M, Kobayashi S, Arata K, J. Am. Chem. Soc., 101, 6439 (1979)

[24] Nagae Y, Jin T, Hattori H, Yamaguchi T, Bull. Chem. Soc. Jpn., 58, 916 (1983)

[25] Kayo A, yamaguchi T, Tanabe K, J. Catal., 83, 99 (1983)

[26] Sohn JR, Kim HW, Park MY, Park EH, J. Catal., in press (1993)

[27] Sohn JR, Jang HJ, J. Mol. Catal., 64, 349 (1991)

[28] Sohn Jr, Kim HJ, J. Catal., 101, 428 (1986)

[29] Sohn JR, Kim HW, Kim JT, J. Mol. Catal., 41, 373 (1987)

[30] Sohn JR, Kim HW, J. Mol. Catal., 52, 361 (1989)

[31] Sohn JR, Kim NW, Kim JT, Korean J. Chem. Eng., 4(1), 1 (1987)

[32] Sohn JR, Jang HJ, Park MY, Park EH, Park SE, J. Mol. Catal., 93, 149 (1994)

[33] Hammet LD, Deyrup AJ, J. Am. Chem. Soc., 54, 272 (1932)

[34] Kera Y, Hirota K, J. Phys. Chem., 73, 3973 (1964)

[35] Bjoklund RB, Odenbrand CUI, Brandin JGM, J. Catal., 119, 187 (1989)

[36] Morrow BA, McFarlane RA, Lion M, Lavalley JC, J. Catal., 107, 232 (1987)

[37] Sohn JR, Cho SG, Pat YI, Hayashi S, J. Catal., submitted for publication

[38] Olah FGA, Prakash GKS, Sommer J, Science, 206, 13 (1979)

[39] Basila MR, Kantner TR, J. Phys. Chem., 71, 467 (1967)

[40] Sohn JR, Ozaki A, J. Catal., 61, 29 (1980)