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Received July 5, 2002
Accepted September 6, 2002
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Catalytic Combustion of Benzene over Supported Metal Oxides Catalysts
Division of Chemical Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, Busan 608-739, Korea
sshong@pknu.ac.kr
Korean Journal of Chemical Engineering, May 2003, 20(3), 440-444(5), 10.1007/BF02705544
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Abstract
Catalytic combustion of benzene over supported metal oxides has been investigated. The catalysts have been prepared by incipient wetness method and characterized by XRD, FT-Raman, ESR and TPR. Among supported metal oxides, CuOx supported on TiO2 is found to have the highest activity for benzene oxidation. In addition, among the catalysts of copper oxide supported on TiO2, Al2O3 and SiO2, titania-supported catalyst (CuOx/TiO2) gives the highest catalytic activity. CuOx/TiO2 (Cu loading 5.5 wt%) shows the total oxidation of benzene at about 250 ℃. From the ESR and FT-Raman results, the CuO dispersed on the TiO2 surface acts as an active site of CuOx/TiO2 catalysts on the oxidative decomposition of benzene. The catalytic activity gradually increases with an increase of Cu loading on TiO2. When Cu loading reaches 5.5 wt%, the total conversion temperature is lowered to 300 ℃. However, the catalytic activity considerably decreases at 7 wt% Cu loading. The catalytic activity increased with an increase of oxygen concentration but the concentration of benzene showed no difference in the benzene conversion. This result suggests that the rate determining step is the adsorption of oxygen.
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References
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