Titanium Tetraisopropoxide의 열분해 반응속도

문원석; 김기영; 박승빈

HWAHAK KONGHAK, Vol.33, No.4, 399-406, August, 1995

Export Citation

Titanium Tetraisopropoxide의 열분해 반응속도

Kinetics of Titanium Tetraisopropoxide Pyrolysis

문원석, 김기영, 박승빈

초록

TiO₂로 코팅된 회분식 반응기를 사용하여 titanium tetraisopropoxide(TTIP)의 열분해 반응을 연구하였다. 실험온도는 240 ,270 ,290 ,310℃ 이고, TTIP의 초기농도는 2.78X10^-7, 5.56X10^-7, 1.11X10^-6mol/㎤이었다. TTIP의 열분해 반응은 실험조건하에서 불균일 반응이 더 우세하게 일어났으며 표면에 코팅된 TiO₂에 의해서 촉진되었다. 반응분위기로 사용한 불활성기체는 알곤, 헬륨,질소였으나 기체의 종류는 반응경로 및 속도에 영향을 주지 않았다. 실험적으로 얻은 TTIP 열분해 반응치수는 모두 1차였으며, 반응기 표면에 코팅된 TiO₂로의 TTIP의 흡착이 율속단계이다. 회분식 반응기에서 결정된 속도식은 흐름 반응기의 거동을 잘 예측하였다.

Pyrolysis of titanium tetraisopropoxide(TTIP) was studied using batch-type reactor coated with TiO₂. The reaction temperatures were 240, 270, 290, 310℃ and the initial concentration of TTIP was 2.78×10^-7mol/cm³. The contribution of heterogeneous reaction to the pyrolysis of TTIP was more significant than homogeneous one in the experimental range and the thermal decomposition of TTIP was catalysed by TiO₂ coated on reactor surface. Inert gases(Ar, He, N2) which were used as reaction atmosphere had no effect on reaction path or rate of reaction. The reaction was first order with respect to TTIP and the rate limiting step was the adsorption of TTIP on TiO₂ coated reactor wall. The rate equation obtained from the batch-type reactor predicts reasonably the final conversion of the flow reactor.

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[2] Okuyama K, Jeung JT, Kousaka Y, Nguyen HV, Wu JJ, Flagan R, Chem. Eng. Sci., 44(6), 1369 (1989)

[3] Pratsinis SE, Chem. Eng. Prog., 62, May (1989)

[4] Griffin GL, J. Electrochem. Soc., 137(3), 814 (1990)

[5] Ohshima K, Tsuto K, Okuyama K, Tohge N, Aerosol Sci. Technol., 19, 468 (1993)

[6] Sladek KJ, Herron HM, Ind. Eng. Chem. Prod. Res. Dev., 11(1), 92 (1972)

[7] Yokozawa M, Iwasa H, Taramoto I, Jpn. J. Appl. Phys., 7, 96 (1968)

[8] Takahashi Y, Suzuki H, Nasu M, J. Chem. Soc.-Faraday Trans., 81, 3117 (1985)

[9] Komiyama H, Kanai T, Inoue H, Chem. Lett., 1283 (1984)

[10] Kanai T, Komiyama H, Inoue H, Kag. Kog. Ronbunshu, 11(3), 317 (1985)

[11] Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases and Liquids," 4th ed., McGraw-Hill, New York, NY (1988)