287257 Intracrystalline Diffusion of Linear Alkanes and Linear Alcohols in SAPO-34

Tuesday, October 30, 2012
Hall B (Convention Center )
Célio L. Cavalcante Jr., Chemical Engineering, Universidade Federal do Ceará, Fortaleza, Brazil, Julien Cousin saint Remi, Chemical Engineering, VUB (Vrije Universiteit Brussel), Brussels, Belgium, Joeri Denayer, Dept. Chemical Engineering, Vrije Universiteit Brussel, Brussel, Belgium and Gino Baron, Department of Chemical Engineering, Vrije Universiteit Brussel, Brussels, Belgium

SAPO-34 is a silicon-, aluminum-, and phosphorus-based molecular sieve with CHA topology. It has a three-dimensional pore system with ellipsoidal shaped cages of 6.7 x 10 Å2 interconnected via 8-membered ring windows with pore apertures of 3.8 x 3.8 Å2. As a result of its small pore size, SAPO-34 is a highly selective catalyst and has been applied for methanol-to-olefins and methanol-to-gasoline catalytic processes. It can also be applied for CO2 – N2– CH4 separations. Adsorption of linear alkanes and linear alcohols in liquid phase conditions have been reported by Denayer et al. (J.Phys. Chem. C, 2008, 2011), showing chain length dependency of adsorption properties in this type of material. In this study, we present  experimental measurements for intracrystalline diffusivities at different temperatures of linear alkanes (C5-C10) and linear C1-C8 alcohols in SAPO-34 samples using the ZLC (Zero-Length Column) method originally proposed by Eic and Ruthven (Zeolites, 1988). Activation energies are also reported for those systems.

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