Preparação de membranas zeolíticas (MCM-22/a-alumina), em escala de laboratório, utilizando rubbing, dip-coating e transporte a vapor.

Abstract

The development of technologically advanced new materials, new as membranes with improved chemical and thermal stabilities, have become of great interest, especially with respect to industrial applications. A great interest has been shown for the zeolite membrane because they have superior characteristics to molecular sieves, structural stability and large surface areas. Due to the technological importance of zeolite membranes, this research aimed to develop type materials: MCM-22 zeolite, ceramic support membranes and zeolite (MCM-22 / α-alumina), using three different methods: Rubbing, Dip coating and Transportation steam. Obtaining the zeolite MCM-22 could be confirmed by X-ray diffraction From the image obtained by SEM, it was possible to analyze the zeolite MCM-22 consists of clusters of particles of spherical shape. The ceramic support was prepared by forming technique and subsequently submitted to a sintering temperature of 1200 º C/1h (α-alumina) and characterized by spectrometry Energy Dispersive X-ray (EDX), X-ray Diffraction (XRD), Microscopy Scanning electron (SEM) and mercury porosimetry. The zeolite membranes were characterized by XRD, SEM and EDX. The results obtained by mercury porosimetry showed that the α-alumina present in the majority of pores ranging in diameter from around 0.71 m and porosity values of 33.37%. The images obtained by SEM zeolite membranes (MCM-22/α-alumina) obtained by the methods (i) Rubbing (ii) dip coating and (iii) the vapor transport showed that the method was vapor transport best method among the methods used since they showed the formation of a homogeneous surface with no cracks or surface defects on the surface of the porous support of α-alumina.