Al2O3-supported transition-metal oxide catalysts for catalytic incineration of toluene.
The catalytic incineration of toluene over gamma-Al2O3-supported transition-metal oxide catalysts in the temperature range of 200-380 degrees C was investigated employing a fixed bed flow reactor. CuO/gamma-Al2O3 was found to be the most active of seven catalysts tested. Using this catalyst with different wt% Cu in the incineration of toluene, we found that the optimal Cu content was 5 wt%. X-ray diffraction, BET surface area and hydrogen-temperature-programmed reduction showed that it was mainly the formation of large CuO crystals that caused declines in catalyst activity at Cu content above 5 wt%. Addition of water vapor or CO2 inhibited catalyst activity, but this effect was reversible. Although coexistence of toluene and n-hexane resulted in a reduction in n-hexane conversion, the impact on toluene oxidation was only negligible. Temperature-programmed desorption revealed that this differential effect was due to more competitive adsorption of toluene onto active sites of the catalyst.
Wang
Ching-Huei
CH
Department of Chemical Engineering, Kao Yuan Institute of Technology, Kaohsiung 821, Taiwan, ROC. huei@cc.kyit.edu.tw
D000397:Air Pollution / Q000517:prevention & control*; D000537:Aluminum Oxide / Q000737:chemistry*; D002245:Carbon Dioxide; D002384:Catalysis; D003300:Copper; D017745:Incineration / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D014050:Toluene / Q000737:chemistry*; D014867:Water; D014961:X-Ray Diffraction
D014867:Water; D002245:Carbon Dioxide; D014050:Toluene; D003300:Copper; D000537:Aluminum Oxide