Catalytic Recombination of Hydrogen and Oxygen in Air Stream

Kwang-Rag Kim; Seung-Woo Paek; Heui-Joo Choi; hongsuk Chung

Journal of Industrial and Engineering Chemistry, Vol.7, No.2, 116-120, March, 2001

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Catalytic Recombination of Hydrogen and Oxygen in Air Stream

Kwang-Rag Kim^†, Seung-Woo Paek, Heui-Joo Choi, and hongsuk Chung

Korea Atomic Energy Research Institute, Yusong, Taejon 305-600, Korea

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This paper presents the results of a study aimed at determining the feasibility of using catalytic oxidation to scavenge hydrogen from air. A series of experiments were conducted to assess the catalytic recombination characteristics of hydrogen in an air stream using 0.5% Pd/alumina catalysts. The H2 to H2O fractional conversion was determined at various inlet air temperatures (25∼150 ℃) and flow rates (5∼15 L/min.). The catalyst produced remarkable fractional conversion values up to 0.9 when operated at 150 ℃ with an apparent activation energy of about 3.17 kcal/mol within a temperature range of 50∼150 ℃. The results show that the catalyst had a relatively low activated energy and possessed satisfactory characteristics for catalytic oxidation.

Keywords:Catalytic Oxidation;Hydrogen Removal;Pd/Alumina Catalyst;Nuclear Reactor

[References]

Snoeck J, in Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, M. Giot, F. Mayinger, and G.P. Celata Eds., Invited Lecture, pp. 747-754 (1997)
Kumar RK, Koroll GW, in Nuclear Safety Design Features, D.B. Trauger Ed., 33(3), 398 (1992)
Fischer K, Nucl. Technol., 112, 58 (1995)
Blanchat TK, Malliakos A, in Performance Testing of Passive of Autocatalytic Recombiners, NUREG/CR-6580, Sandia National Laboratories, Albuquerque, NM (1998)
Jankowski M, in Nuclear Science and Technology-Hydrogen in Water-Cooled Nuclear Power Reactors, Commission of the European Communities, Brussels, Luxembourg (1992)
King RB, Bhattacharyya NK, Smith HD, Wiemers KD, Environ. Sci. Technol., 32(20), 3178 (1998)
Hsu CW, Ritter JA, Nucl. Technol., 116, 196 (1996)
Hsu CW, Ritter JA, Nucl. Technol., 116, 360 (1996)
Sherwood AE, in Catalytic Oxidation of Tritium in Air at Ambient Temperature, UCRL-52811, Lawrence Livermore Laboratory, Livermore, CA (1979)
Folkers CL, Cena RJ, in Tritium-Containment Systems: a Tradeoff Study, UCRL-52627, Lawrence Livermore Laboratory, Livermore CA. (1978)
Mintz JM, Gildea PD, in Catalytic Oxidation Efficiencies for Tritium and Tritiated Methane, Industrial-Scale Decontamination System, SAND60-8046, Sandia Laboratory, Livermore, CA. (1980)
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[Referenced By]

[1] Snoeck J, in Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, M. Giot, F. Mayinger, and G.P. Celata Eds., Invited Lecture, pp. 747-754 (1997)

[2] Kumar RK, Koroll GW, in Nuclear Safety Design Features, D.B. Trauger Ed., 33(3), 398 (1992)

[3] Fischer K, Nucl. Technol., 112, 58 (1995)

[4] Blanchat TK, Malliakos A, in Performance Testing of Passive of Autocatalytic Recombiners, NUREG/CR-6580, Sandia National Laboratories, Albuquerque, NM (1998)

[5] Jankowski M, in Nuclear Science and Technology-Hydrogen in Water-Cooled Nuclear Power Reactors, Commission of the European Communities, Brussels, Luxembourg (1992)

[6] King RB, Bhattacharyya NK, Smith HD, Wiemers KD, Environ. Sci. Technol., 32(20), 3178 (1998)

[7] Hsu CW, Ritter JA, Nucl. Technol., 116, 196 (1996)

[8] Hsu CW, Ritter JA, Nucl. Technol., 116, 360 (1996)

[9] Sherwood AE, in Catalytic Oxidation of Tritium in Air at Ambient Temperature, UCRL-52811, Lawrence Livermore Laboratory, Livermore, CA (1979)

[10] Folkers CL, Cena RJ, in Tritium-Containment Systems: a Tradeoff Study, UCRL-52627, Lawrence Livermore Laboratory, Livermore CA. (1978)

[11] Mintz JM, Gildea PD, in Catalytic Oxidation Efficiencies for Tritium and Tritiated Methane, Industrial-Scale Decontamination System, SAND60-8046, Sandia Laboratory, Livermore, CA. (1980)

[12] Li Q, Yuan S, Ye C, Zhao K, Xi R, in Proc. 20th DOE/NRC Nuclear Air Cleaning Conference. Sessions 6-15, pp. 879-895 (1989)