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Analysis of the ITQ-12 Zeolite Performance in Propane−Propylene Separations Using a Combination of Experiments and Molecular Simulations

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2010-08-13
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ACS Publications
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We present a combined computational and experimental approach to evaluate the suitability of the ITQ-12 nanoporous material (ITW) as a propane-propylene separation device. For this, we have computed adsorption and diffusion of propane and propylene in the ITQ-12 zeolite. The propane isotherm is reproduced well, but the available propylene models in the literature are unable to describe the propylene isotherm. Newly developed force field parameters for propylene were obtained by fitting to our own experimental adsorption isotherms and validated with previous data taken from the literature. To obtain self-diffusion of propane and propylene in the zeolite, we combined the configurational-bias Monte Carlo method with rare-event molecular simulation techniques. Our results support experimental observations that point out ITQ-12 as a suitable structure for propane-propylene separation. The selectivity originates mainly from a difference in adsorption, possibly enhanced by a difference in diffusion.
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info:eu-repo/grantAgreement/MEC//CTQ2007-63229/ES/APLICACION DE TECNICAS COMPUTACIONALES EN EL DISEÑO DE NUEVOS MATERIALES MULTIFUNCIONALES/
info:eu-repo/grantAgreement/MICINN//MAT2009-14528-C02-01/ES/Sintesis, Caracterizacion Avanzada Y Empleo En Procesos Industriales De Nuevas Zeolitas Obtenidos Con Cationes Organicos No Convencionales Como Agentes Directores De Estructura/
P07-FQM- 02595
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This work was supported by the Spanish “Ministerio de Educacio´n y Ciencia (MEC)” (CTQ2007-63229 and MAT2009-14528-C02-01), and de Andalucı ´a (P07-FQM-02595). We thank Jose Luis Jorda´ for performing the Rietveld analysis of the X-ray diffraction pattern of the ITQ-12 sample. M.P. thanks CSIC for a JAE doctoral fellowship, and J.J.G.-S. thanks MEC (CTQ2007-63229) for his predoctoral fellowship
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J. Phys. Chem. C 2010, 114, 14907–14914
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