Diffusion Mechanisms within Microporous and Mesoporous Materials in Gas and Liquid Phases

Nakasaka Yuta, Tago Teruoki, Yano Kazuhisa, Masuda Takao

doi:10.5360/membrane.32.332

The diffusivities of hydrocarbons within zeolite in gas phase have been measured widely. On the other hand, there have been few reports concerning measurements of the diffusivities of molecules within catalysts in the liquid phase as compared with those in the gas phase, because it is difficult to measure directly and continuously the change in the diffusate concentrations with time due to adsorption and diffusion into the catalysts in the liquid phase. In our recent research, we succeeded in developing a new method for measuring diffusivities within solid catalyst in liquid phase using Raman spectroscopy. Constant volumetric method was employed in this measurement, and diffusion mechanisms of hydrocarbons within solid catalyst were investigated by measuring separately intracrystalline diffusivity and partition factor. Intracrystalline diffusivity directly represents the mobility of molecules within pores. And the partition factor is the ratio of the diffusate concentration in solid catalyst to that in bulk phase, and means the concentration effect. Effective diffusivity is obtained by multiplying the intracrystalline diffusivity by the partition factor. In this manuscript, we review intracrystalline and effective diffusivities of hydrocarbons within porous solid catalyst in gas and liquid phases by introducing our recent research.

Diffusion Mechanisms within Microporous and Mesoporous Materials in Gas and Liquid Phases

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