PREPARATION METHOD FOR MOLECULAR SIEVE MEMBRANE SUPPORT BODY

摘要

A preparation method for a molecular sieve membrane support body; according to the molar ratio of magnesium, aluminium and silicon in cordierite, a nano-composite sol prepared from magnesium, aluminium, silicon, and a lanthanum sintering aid using a sol-gel method is wrapped and adhered to a dispersed micron-grade cordierite powder surface; the sol is converted into a nano-composite oxide by means of pre-sintering, and the powder is mixed with a binder and water into a mud material, extruded, and sintered into a cordierite support body; a thin film of zirconium oxide aqueous dispersion is coated onto the outside of the cordierite support body and sintered in order to obtain a molecular sieve membrane support body composed of a cordierite main support layer and a zirconium oxide thin film layer. The present method prepares a double-layer composite support body, and the base layer thin film of the support body on which the molecular sieve grows having smaller and more uniform pores and higher porosity, such that the molecular sieve membrane grown on said thin film is more uniform, and has a shorter growth period and no defects.