Ordinary molecular diffusion temperature dependence

The Stokes-Einstein equation for liquid-phase ordinary molecular diffusion coefficients in binary mixtures suggests that the product of Hab and the solvent viscosity /u-b should scale linearly with temperature T. Cite references (i.e., equations) from the literature and evaluate the product of Hab and /xb in terms of its scaling-law dependence on temperature for low-density gases. In other words ... 

The three-halves power of dimensionless temperature in the expression for eA( ) is based on the temperature dependence of gas-phase ordinary molecular diffusion coefficients when the catalytic pores are larger than 1 p.m. In this pore-size regime, Knudsen diffusional resistance is negligible. The temperature dependence of the collision integral for ordinary molecular diffusion, illustrated in Bird et al. (2002, pp. 526, 866), has not been included in ea) ). The thermal energy balance given by equation (27-28), which includes conduction and interdiffu-sional fluxes, is written in dimensionless form with the aid of one additional parameter,... 

The temperature dependence of the effective intrapellet diffusion coefficient conforms to the assumption that ordinary molecular diffusion provides the dominant resistance to mass transfer in the pores, relative to Knudsen diffusion. This is valid when the pore diameter is larger than 1 tim. Gas-phase diffusivities are approximately proportional to the three-halves power of absolute temperature. Hence,... 

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