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      저자 : Klvana, Danilo (검색결과 2 건)
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        Selective and Complete Catalytic Oxidation of Natural Gas in Turbulent Fluidized Beds

        Klvana, Danilo,Chaouki, Jamal,Guy, Christophe 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.4

        Turbulent Fluidized Bed (TFB) reactors appears to be ideal for exothermic and fast reactions such as catalytic oxidation of methane. In this paper, a use of TFB reactor for two catalytic oxidation of methane: catalytic combustion of methane and catalytic selective oxidation of methane for the ethylene synthesis is described. Catalytic fluidized bed combustion of methane is shown to be an emerging technology capable of meeting all environmental constraints as far as nitrogen oxides and carbon monoxide are concerned. This reaction carried out in both the bubbling and the turbulent regimes at 450-500℃ shows that the turbulent regime is more favourable. A self-sustained combustion with complete conversion and a zero emission of NO_x and CO was achieved with a mixture of 4% methane in air at 500℃. The two-phase model of Werther [1990], which phenomenologically introduces the enhancement factor due to chemical reaction, predicts quite well the combustor performance. The same model but without enhancement factor (slower reactions) predicts satisfactorily the experimental data for the oxidative coupling of methane and can be used to quantify the influence of homogeneous and catalytic reactions.

      • SCIESCOPUSKCI등재

        Catalytic Decomposition of Nitric Oxide by Perovskites

        Kirchnerova, Jitka,Klvana, Danilo,Tofan, Carmen 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.4

        Catalytic decomposition of nitric oxide has been studied for nearly a century, using materials ranging from noble metals to alkaline earth metal oxides, without much success. Only since about last fifteen years some progress in finding promising materials has been made. Of the numerous catalyst systems studied, very few show tangible decomposition rates : copper substituted zeolites, silver-cobalt mixed oxides, some perovskites, and supported noble metals. Although at 773 K the rates of decomposition over zeolites are two to three orders higher than those over remaining systems, these materials have very low thermal stability, above 773 K. In this respect, perovskites have much higher potential, although so far no composition exhibiting practical decomposition rates has been found. Systematic study of the effect of composition on the performance should help to advance the complete understanding of this important reaction. In this paper a current state of art is outlined, and some latest preliminary results for new specially formulated perovskites are presented.

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