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Received September 3, 2001
Accepted October 5, 2001
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Photochemical Production of Hydrogen from Alkaline Solution Containing Polysulfide Dyes
LG Chemical Ltd., Research Park, Daejeon 305-380, Korea 1School of Chemical Engineering, Seoul National University, Seoul 151-744, Korea 2Department of Chemical Engineering, Kyungwon University, Kyonggi-do 461-701, Korea
hilee@snu.ac.kr
Korean Journal of Chemical Engineering, November 2001, 18(6), 894-897(4), 10.1007/BF02705614
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Abstract
Efficient hydrogen production was achieved by irradiating solutions containing polysulfide dyes as a photoabsorber. In the presence of polysulfide only, considerable amount of hydrogen was initially evolved and followed by the rapid decrease of the evolution rate. On the contrary, in the co-presence of NiOx(x<1)/TiO2 and polysulfide, steady evolution of hydrogen was observed even after long period of illumination. The photocatalytic evolution of hydrogen was divided into two stages: i) in the first stage within 1 hour irradiation, the hydrogen evolution rate was abruptly increased due to the conversion of polysulfide to partially oxidized sulfur, S2Ox2-; ii) in the secondary stage after 1 hour irradiation, steady evolution of hydrogen was observed due to the conversion of partially oxidized sulfur to fully oxidized sulfur. The oxidation/reduction of sulfur occurred more favorably over SiC catalyst where more steady evolution of hydrogen was achieved.
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