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Sorption and Diffusion of p-Xylene and o-Xylene in Aluminophosphate Molecular Sieve AlPO4-11
Authors:Célio L. Cavalcante Jr  Diana C.S. Azevêdo  Irla G. Souza  A. Cristina M. Silva  Odelsia L.S. Alsina  Verôonica E. Lima  Antonio S. Araujo
Affiliation:(1) Departamento de Engenharia Química GPSA, Grupo de Pesquisas em Separações por Adsorção, Universidade Federal do Ceará, Campus do Pici, Bl. 710 - Fortaleza-CE, 60.455-760, Brazil;(2) Departamento de Engenharia Química GPSA, Grupo de Pesquisas em Separações por Adsorção, Universidade Federal do Ceará, Campus do Pici, Bl. 710 - Fortaleza-CE, 60.455-760, Brazil;(3) Departamento de Engenharia Química Campina Grande, PB, Universidade Federal da Paraíba, 58109-970, Brazil;(4) Departamento de Química Natal, RN, Universidade Federal do Rio Grande do Norte, 59078-970, Brazil
Abstract:This paper presents experimental results for equilibrium and diffusion of C8 aromatics in laboratory synthesised crystals of AlPO4-11. The samples were prepared by the hydrothermal method, starting from pseudobohemite (CONDEA), 85% phosphoric acid, water and di-isopropilamine as organic template. Adsorption and diffusion data were obtained mainly by gravimetry at temperatures between 60–100°C. Saturation capacities were found in the range of 4 wt%. Equilibrium constants were estimated using virial plots yielding heats of adsorption between 10–12 Kcal/mol at low coverage. Intracrystalline diffusivities at higher temperatures (150–180°C) were also measured, using the Zero-Length-Column (ZLC) method. Diffusivities from both methods (gravimetric and ZLC) agreed reasonably well and followed a typical Arrhenius behaviour, with low activation energy (ca. 7 Kcal/mol).
Keywords:equilibrium  diffusion and kinetics  AlPO4-11 molecular sieve
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