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Stagnation-flow reactor를 이용한 Rh/Al₂O₃ 촉매의 저온 건식 메탄 개질 반응 속도론적 분석
배용균(Yong Gyun Bae),홍종섭(Jong Sup Hong) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Low temperature dry reforming of methane is studied by using rhodium supported on aluminium oxide employed in a stagnation-flow reactor. The stagnation-flow reactor enables microprobe sampling of the compositional boundary layer in the vicinity of the catalyst surface. This configuration also makes it relatively simple to resolve numerically the complex reacting flow environment coupled with mass/momentum/energy transport phenomena. A numerical model can examine quantitatively the net production of each elementary step (48-step surface reaction mechanism) with varying operating temperature. To determine the main reaction pathways and rate-determining steps, partial equilibrium, activation energy of methane decomposition, sensitivity analysis with respect to pre-exponentials are conducted. It is elucidated that the dry reforming of methane is predominantly rate-determined by methane dehydrogenation steps. Especially, at low temperature region, apparent activation energy of methane conversion increases sharply with the temperature, whereas that of carbon dioxide shows trivial increase. The simulation results also show the dependence of thermal/fluidic effects on reaction kinetics including the catalyst temperature, reactants flow rate, mass/thermal diffusion in a porous catalyst layer.