Abstract
ABSTRACTThe relationship between mass transfer and reaction within the washcoat is investigated in a monolith type micro-scale Pt-catalytic combustor. Nondimensionalized balance equation of butane is applied in a simplified washcoat geometry having the shape of slab. Both Thiele modulus and effectiveness factor are considered to compare reaction rate and diffusion rate according to the operation temperature and the diameter of alumina nano-pores. The effect of reaction becomes stronger as the temperature increases, while the effect of diffusion becomes relatively dominant as the diameter of nano-pores increases. From the analysis of butane distribution within the washcoat, design criterion for the thickness of washcoat is discussed. Key Words : Micro catalytic combustor, Washcoat, Thiele modulus, Effectiveness factor, Design criterion 기 호 설 명 Alphabets A : pre-exponential factor A ' : product of A and effectiveness factor (η) C B : molecular concentration of butane D : diffusion coefficient
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