Sorption and Diffusion of p-Xylene and o-Xylene in Aluminophosphate Molecular Sieve AlPO4-11 |
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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 |
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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 |
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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). |
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Keywords: | equilibrium diffusion and kinetics AlPO4-11 molecular sieve |
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