Heat transfer limitations Clause Samples

Heat transfer limitations. Temperature gradients between the bulk gas and the surface of the catalyst pellet The diffusion of the gas through the pore of the catalyst can limit the reaction rate if the velocity of the reaction is much higher than the velocity of diffusion. In the eggshell catalyst the thin layer of catalyst allows to neglect this effect. In order to validate of this hypothesis the ▇▇▇▇▇-▇▇▇▇▇▇ criterion was applied to estimate the influence of diffusion mechanism through the catalyst pore on the reaction rates [33]: −𝑟′𝐶𝑂(𝑜𝑏𝑠) ∙ 𝜌𝑐 ∙ 𝑅2 𝐶𝑊𝑃 = 𝐷𝑒𝑓𝑓,𝐶𝑂 ∙ 𝐶𝐶𝑂