Performance of the supported copper oxide catalysts for the catalytic incineration of aromatic hydrocarbons.
A fixed bed reactor was used to assess the catalytic incineration of toluene by various transition-metal oxide species supported on gamma-Al(2)O(3). CuO/gamma-Al(2)O(3) was found to be the most active of seven catalysts investigated. The CuO species, with a Cu content of 5% (wt), was hence used with four different supports (CeO(2), gamma-Al(2)O(3), TiO(2) and V(2)O(5)) in order to define the optimal combination. Results of the catalytic incineration of toluene, X-ray diffraction (XRD) analysis, oxygen-temperature programmed desorption (O(2)-TPD), toluene-temperature programmed desorption (toluene-TPD) and hydrogen-temperature programmed reduction (H(2)-TPR) showed that CuO/CeO(2) was the most active catalyst, followed by CuO/gamma-Al(2)O(3). The activity of CuO/CeO(2) with respect to the VOC molecule was observed to follow this sequence: toluen>p-xylene>benzene. The addition of water vapor or CO(2) significantly inhibited the activity of the CuO/CeO(2) and CuO/gamma-Al(2)O(3) catalysts. The inhibiting effect of both was reversible for CuO/gamma-Al(2)O(3). For CuO/CeO(2), the inhibiting effect of CO(2) was reversible and even insignificant at a higher temperature (220 degrees C), but the effect of H(2)O vapor was somewhat irreversible at lower incineration temperatures (220 degrees C). For complete oxidation of toluene, the required reaction temperature increased with gas hourly space velocity (GHSV) and toluene inlet concentration.
Wang
Ching-Huei
CH
Department of Biochemical Engineering and Graduate Institute of Environmental Polymer Materials, Kao Yuan University of Technology, Kaohsiung 821, Taiwan.
Lin
Shiow-Shyung
SS
Chen
Chun-Liang
CL
Weng
Hung-Shan
HS
D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D006841:Hydrocarbons, Aromatic / Q000032:analysis*; D017745:Incineration / Q000379:methods*; D014050:Toluene / Q000032:analysis; D014835:Volatilization
D000393:Air Pollutants; D006841:Hydrocarbons, Aromatic; D002245:Carbon Dioxide; D014050:Toluene; D003300:Copper; C030973:cupric oxide