Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF4) and Hexafluoroethane (C2F6) on Activated Carbon

Jiyoung Shin; Sung-Sup Suh; Moon Kyu Choi

Clean Technology, Vol.20, No.1, 22-27, March, 2014

Export Citation

Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF4) and Hexafluoroethane (C2F6) on Activated Carbon

Jiyoung Shin, Sung-Sup Suh , and Moon Kyu Choi^†

Department of Chemical Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, Korea

E-mail:

초록

CF4와 C2F6의 압력이 20.7 kPa 이하일 경우, 활성탄에의 평형흡착량을 여러 온도(293.15-333.15 K)에서 실험적으로 조사하였다. 실험데이터가 가장 잘 맞을 수 있도록 1차층 흡착으로 Langmuir모델을 쓰고 그 다음 단계에는 Freundlich 물리흡착을 이용하는 이단계모델을 제안한다. 1단계에 대한 흡착엔탈피를 구하기 위해 실험데이터의 최초기울기를 이용하였고, Clausius-Clapeyron식을 사용함으로써 2단계에 대한 흡착엔탈피를 구하였다. CF4의 경우 1, 2단계의 흡착엔탈피는 각각 25.9와 11.8 kJ/mol이고, C2F6의 경우는 38.7과 38.2 kJ/mol이다.

Under low pressures of CF4 and C2F6 up to 20.7 kPa, the equilibrium adsorbed quantity on activated carbon was experimentally examined using the volumetric method at various temperatures between 293.15 K and 333.15 K. To give the best fit to the experimental data curve, the two step model (i.e., Langmuir model for the first layer adsorption and then Freundlich physisorption) is suggested. The method of initial slope yielded the enthalpy of adsorption for the first step while we could apply the Clausius-Clapeyron equation to find the heat of adsorption of the second step. They are 25.9 kJ/mol and 11.8 kJ/mol, respectively, with CF4, and 38.7 and 38.2 kJ/mol with C2F6.

Keywords:Enthalpy change of adsorption;Tetrafluorocarbon;Hexafluorocarbonethane;PFC

[References]

Pulselli FM, “Global Warming Potential and the Net Carbon Balance,” Encyclopedia of Ecology, Elsevier, 2008, pp. 1741-1746.
Dutta PK, Radner R, J. Economic Behavior Organization, 71(2), 187 (2009)
Lashof DA, Ahuja DR, Nature, 344, 529 (1990)
Sekiya A, Okamoto S, J. Fluorine Chem., 131(2), 364 (2010)
Naik V, Jain AK, Patten KO, Wuebbles DJ, J. Geophysical Res., 105(5), 6904 (2000)
Tanada S, Kawasaki N, Nakamura T, Ohue T, Abe I, J. Colloid Interface Sci., 191(2), 337 (1997)
Van Hoeymissen JAB, Daniels M, Anderson N, Fyen W, Heyns M, Mat. Res. Soc. Symp. Proc., 447, 55 (1997)
Lucas PL, van Vuuren DP, Olivier JGJ, den Elzen MGJ, Environ. Sci. Policy, 10(2), 85 (2007)
Johnson AD, Entley WR, Maroulis PJ, Solid State Technol., 43, 103 (2000)
Tsai WT, Chen HP, Hsien WY, J. Loss Prev. Process Ind., 15, 65 (2002)
Chang MB, Lee HM, Catal. Today, 89(1-2), 109 (2004)
Brown RS, Rossin JA, Solid State Technol., 44(7), 189 (2001)
Streif T, DePinto G, Dunnigan S, Atherton A, “PFC Reduction through Process and Hardware Optimization,” Semiconductor International, 20(June), pp. 129-134 (1997)
Chiarello R, “ESH issues make progress,” Semiconductor International, 24(March), 81-88 (2001)
Sikdar SK, Burckle J, Rogut J, Environ. Prog., 20(1), 1 (2001)
Herzog F, Studies Environ. Sci., 61, 309 (1994)
Muller EA, Environ. Sci. Technol., 39, 8736 (2005)
Ahn NG, Kang SW, Min BH, Suh SS, J. Chem. Eng. Data, 51(2), 451 (2006)
Foder M, Wimmer R, Yang J, McCay T, Electrochem. Soc. Proc., 99, 60 (1999)
Kowalczyk P, Holyst R, Environ. Sci. Technol., 42, 2931 (2008)
Bansal RC, Goyal M, Activated Carbon Adsorption, Taylor & Francis, Boca Raton, FL, pp. 243-292. (2005)
Yang RT, Adsorbents: Fundamentals and Applications, A John Wiley & Sons, Inc., Hoboken, New Jersey, pp. 303-305 (2003)

[Referenced By]

[Related Articles]

[1] Pulselli FM, “Global Warming Potential and the Net Carbon Balance,” Encyclopedia of Ecology, Elsevier, 2008, pp. 1741-1746.

[2] Dutta PK, Radner R, J. Economic Behavior Organization, 71(2), 187 (2009)

[3] Lashof DA, Ahuja DR, Nature, 344, 529 (1990)

[4] Sekiya A, Okamoto S, J. Fluorine Chem., 131(2), 364 (2010)

[5] Naik V, Jain AK, Patten KO, Wuebbles DJ, J. Geophysical Res., 105(5), 6904 (2000)

[6] Tanada S, Kawasaki N, Nakamura T, Ohue T, Abe I, J. Colloid Interface Sci., 191(2), 337 (1997)

[7] Van Hoeymissen JAB, Daniels M, Anderson N, Fyen W, Heyns M, Mat. Res. Soc. Symp. Proc., 447, 55 (1997)

[8] Lucas PL, van Vuuren DP, Olivier JGJ, den Elzen MGJ, Environ. Sci. Policy, 10(2), 85 (2007)

[9] Johnson AD, Entley WR, Maroulis PJ, Solid State Technol., 43, 103 (2000)

[10] Tsai WT, Chen HP, Hsien WY, J. Loss Prev. Process Ind., 15, 65 (2002)

[11] Chang MB, Lee HM, Catal. Today, 89(1-2), 109 (2004)

[12] Brown RS, Rossin JA, Solid State Technol., 44(7), 189 (2001)

[13] Streif T, DePinto G, Dunnigan S, Atherton A, “PFC Reduction through Process and Hardware Optimization,” Semiconductor International, 20(June), pp. 129-134 (1997)

[14] Chiarello R, “ESH issues make progress,” Semiconductor International, 24(March), 81-88 (2001)

[15] Sikdar SK, Burckle J, Rogut J, Environ. Prog., 20(1), 1 (2001)

[16] Herzog F, Studies Environ. Sci., 61, 309 (1994)

[17] Muller EA, Environ. Sci. Technol., 39, 8736 (2005)

[18] Ahn NG, Kang SW, Min BH, Suh SS, J. Chem. Eng. Data, 51(2), 451 (2006)

[19] Foder M, Wimmer R, Yang J, McCay T, Electrochem. Soc. Proc., 99, 60 (1999)

[20] Kowalczyk P, Holyst R, Environ. Sci. Technol., 42, 2931 (2008)

[21] Bansal RC, Goyal M, Activated Carbon Adsorption, Taylor & Francis, Boca Raton, FL, pp. 243-292. (2005)

[22] Yang RT, Adsorbents: Fundamentals and Applications, A John Wiley & Sons, Inc., Hoboken, New Jersey, pp. 303-305 (2003)