CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)

Zeolites are inorganic materials with intrinsic microporous properties. Basically they are aluminasilicates constituted from a three dimensional network of Si0(4) and A10(4) tetrahedra. This type of materials may have very interesting applications like adsorbents or molecular sieves. In this study,...

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Autores principales:	SILVA,L, PLAZA,A, ROMERO,J, SANCHEZ,J, RIOS,G. M.
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2008
Materias:	Zeolite microporous materials supercritical fluids mass transfer permeability high pressure
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000100017
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spelling	oai:scielo:S0717-970720080001000172008-07-03CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)SILVA,LPLAZA,AROMERO,JSANCHEZ,JRIOS,G. M. Zeolite microporous materials supercritical fluids mass transfer permeability high pressure Zeolites are inorganic materials with intrinsic microporous properties. Basically they are aluminasilicates constituted from a three dimensional network of Si0(4) and A10(4) tetrahedra. This type of materials may have very interesting applications like adsorbents or molecular sieves. In this study, mass transfer properties of supported MFI zeolite membranes at high pressure are established using a new experimental methodology. The aim of this study was the analysis of the mass transfer of a compressed carbon dioxide through microporous zeolite membranes in order to characterize its structural parameters, identifying mass transfer mechanisms under high pressure conditions. This type of materials can be used like molecular sieves, since they present a crystalline structure with interstitial micropores of a mean pore diameter of 0.55 nm. For this purpose, we studied the mass transfer of high pressure C0(2) through microporous MFI zeolite membranes using a new experimental methodology in order to determine the permeance of carbon dioxide using an original apparatus operating in transient state. Carbon dioxide is used in experiments taking into account several applications reported in the literature coupling recovery or separation of this compound from gaseous solutions with inorganic molecular sieves. Values of flux (mol m"² s"¹) and permeance (mol m"² s"¹ Pa"¹) have been obtained experimentally. This new experimental device allows estimating permeance values between 3.59,10"' and 7.51,10"' mol m"² s"¹ Pa"¹) when the values of feed pressure are ranged between 3 and 14 MPa and the temperature varies between 25 and 100°C. These values are coherent with the microscopic nature of pores, showing that the zeolite layer deposed on the macroporous support was synthesized without macroporous defaults. An activated diffusion through the micropores might be identified in the gas phase, but under supercritical conditions (P > P , T > T) an irreversible modification of transport properties was observed. This behavior was explained by a limited mechanical resistance of the membrane at high pressure conditions. In supercritical conditions, mass transfer could be controlled by a combination of diffusion through mesoscopic and microscopic porosityinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.53 n.1 20082008-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000100017en10.4067/S0717-97072008000100017
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Zeolite microporous materials supercritical fluids mass transfer permeability high pressure
spellingShingle	Zeolite microporous materials supercritical fluids mass transfer permeability high pressure SILVA,L PLAZA,A ROMERO,J SANCHEZ,J RIOS,G. M. CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)
description	Zeolites are inorganic materials with intrinsic microporous properties. Basically they are aluminasilicates constituted from a three dimensional network of Si0(4) and A10(4) tetrahedra. This type of materials may have very interesting applications like adsorbents or molecular sieves. In this study, mass transfer properties of supported MFI zeolite membranes at high pressure are established using a new experimental methodology. The aim of this study was the analysis of the mass transfer of a compressed carbon dioxide through microporous zeolite membranes in order to characterize its structural parameters, identifying mass transfer mechanisms under high pressure conditions. This type of materials can be used like molecular sieves, since they present a crystalline structure with interstitial micropores of a mean pore diameter of 0.55 nm. For this purpose, we studied the mass transfer of high pressure C0(2) through microporous MFI zeolite membranes using a new experimental methodology in order to determine the permeance of carbon dioxide using an original apparatus operating in transient state. Carbon dioxide is used in experiments taking into account several applications reported in the literature coupling recovery or separation of this compound from gaseous solutions with inorganic molecular sieves. Values of flux (mol m"² s"¹) and permeance (mol m"² s"¹ Pa"¹) have been obtained experimentally. This new experimental device allows estimating permeance values between 3.59,10"' and 7.51,10"' mol m"² s"¹ Pa"¹) when the values of feed pressure are ranged between 3 and 14 MPa and the temperature varies between 25 and 100°C. These values are coherent with the microscopic nature of pores, showing that the zeolite layer deposed on the macroporous support was synthesized without macroporous defaults. An activated diffusion through the micropores might be identified in the gas phase, but under supercritical conditions (P > P , T > T) an irreversible modification of transport properties was observed. This behavior was explained by a limited mechanical resistance of the membrane at high pressure conditions. In supercritical conditions, mass transfer could be controlled by a combination of diffusion through mesoscopic and microscopic porosity
author	SILVA,L PLAZA,A ROMERO,J SANCHEZ,J RIOS,G. M.
author_facet	SILVA,L PLAZA,A ROMERO,J SANCHEZ,J RIOS,G. M.
author_sort	SILVA,L
title	CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)
title_short	CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)
title_full	CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)
title_fullStr	CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)
title_full_unstemmed	CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)
title_sort	characterization of mfi zeolite membranes by means of permeability determination of near critical and supercritical c0(2)
publisher	Sociedad Chilena de Química
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000100017
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_version_	1718445383337639936

CHARACTERIZATION OF MFI ZEOLITE MEMBRANES BY MEANS OF PERMEABILITY DETERMINATION OF NEAR CRITICAL AND SUPERCRITICAL C0(2)

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