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- W1974043437 abstract "Knowledge of effective diffusion coefficients in char particles is important when interpreting experimental reactivity measurements and modeling char combustion or NO and N 2 O reduction. In this work. NO and N 2 O reaction with a bituminous coal char was studied in a fixed-bed quartz glass reactor. Particle sizes in the range 0.05-5 mm were tested, and the effective diffusion coefficients were estimated from measured effectiveness factors using the Thiele modulus. At 1079 K the effective diffusion coefficients were 5.5×10 −6 m 2 /s and 6.8×10 −6 m 2 /s for N 2 O and NO, respectively. The experimental results were compared with theoretical values calculated from the mean pore radius and the cross-linked pore model. The method of mean pore radius underestimated the effective diffusion coefficient more than an order of magnitude. Using the cross-linked pore model, the bimodal pore size distribution, and a tortuosity factor of 5, a complete agreement between the experimental and the theoretical value was found. The conclusion was that for a char with a wide pore size distribution, the cross-linked pore model is a good choice for a theoretical calculation of the effective diffusion coefficient. In the case of strong pore diffusion limitations, the error in the interpretation of experimental results using the mean pore radius could be a factor of 5 on the intrinsic rate constant. For an average coal char reacting with oxygen at 1300 K, this would be the case for particle sizes larger than about 50 μm." @default.
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- W1974043437 date "2000-01-01" @default.
- W1974043437 modified "2023-09-25" @default.
- W1974043437 title "Effective diffusion coefficients in coal chars" @default.
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- W1974043437 doi "https://doi.org/10.1016/s0082-0784(00)80647-5" @default.
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