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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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  • low-temperature combustion of chlorinated hydrocarbons over ceo2/h-zsm5 catalysts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1069
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      the performance of various ceo2/h-zsm5 catalysts was evaluated for the oxidation of one of the most common chlorinated pollutants found in waste streams, namely 1,2-dichloroethane. the supported samples with varying ceo2 loading (6–50 wt.%) were prepared by impregnation and subsequently calcined at 550 °c. structural, morphological and physico-chemical changes caused by the ceo2 addition were analysed by x-ray diffraction, transmission electronic microscopy, n2-physisorption, temperature-programmed desorption of ammonia and temperature-programmed reduction with hydrogen. the enhancement of the catalytic behaviour of the resulting samples with respect to plain h-zsm5 could be accounted for on the basis of the synergetic role played by oxygen mobility and acid sites. hence, an optimum cerium loading of 11 wt.% was found with a t50 value around 210 °c. at 350 °c, where conversion of the chlorinated feed is about 99%, the major oxidation products were carbon oxides and hydrogen chloride with a reduced presence of chlorinated by-products and molecular chlorine. a relatively good catalytic stability was noticed during 80 h time on line.

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