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(a) Why is an effective diffusivity defined when determining pore diffusion and what does it account for? [6 marks] (b) How can varying catalyst particle

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(a) Why is an effective diffusivity defined when determining pore diffusion and what does it account for? [6 marks] (b) How can varying catalyst particle size during experimentation aid the understanding of pore diffusion? [5 marks] (c) When determining reaction kinetics for a heterogeneously catalysed batch reaction, how and why do you test for film diffusion? [4 marks]

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