首页|Effect of solvents coexistence on the intracrystalline diffusivity of toluene and phenol within Y-type zeolite in the liquid phase
Effect of solvents coexistence on the intracrystalline diffusivity of toluene and phenol within Y-type zeolite in the liquid phase
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NSTL
Elsevier
The intracrystalline diffusivities of phenol and toluene within H-Y-type zeolite (Si/Al = 2.8) in the mesitylene, cyclohexane and 2-propanol in the temperature range from 313 to 353 K were measured using the constant volumetric method. The activation energy for the intracrystalline diffusivity of toluene within H-Y in the liquid phase was larger than that in the gas phase, indicating that the solvent coexisting within the H-Y pores affected the diffusion mechanism of toluene. The intracrystalline diffusivity of phenol within H-Y in mesitylene was smaller than that of toluene. Moreover, the intracrystalline diffusivity of phenol within dealuminated H-Y was higher than those within H-Y, which further indicated that the phenol molecule was more strongly adsorbed on the Bronsted acid sites of H-Y, and this affected the residence time of phenol on the acid sites leading to a decrease in the diffusivity. The intracrystalline diffusivities of phenol within H-Y for the three solvents were in the following order: 2-propanol > cyclohexane > mesitylene. The amount of adsorbed phenol on H-Y in 2-propanol was smallest relative to the amounts of phenol adsorbed on H-Y in the other solvents. The results indicated that the adsorption of phenol on H-Y in the different solvents affected the intracrystalline diffusivity of phenol and its activation energy.
NSTL
Elsevier
