Method for preparing a pillared layered oxide material
AssigneeMobil Oil Corporation
InventorsCharles T. Kresge, Wieslaw J. Roth
Life of this patent
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Abstract
There is provided a method for preparing a pillared layered material, designated MCM-36, with a characteristic X-ray diffraction pattern. Upon calcination of the swollen, non-pillared form of this material, the layers collapse and condense upon one another in a somewhat disordered fashion to form a non-swellable material. However, when the swollen layered material is intercalated with polymeric oxide pillars, the layer separation is maintained, even after calcination. A quaternary ammonium silicate, such as tetramethylammonium silicate, is used as a pillaring agent for treating the swollen material.
Claims17
A method for preparing pillared layered material, desginated MCM-36, said method comprising the steps of:
- (i) preparing a reaction mixture capable of forming a layered material upon crystallization, said reaction mixture containing sufficient amounts of alkali or alkaline earth metal cations, a source of silica containing at least about 30 wt % solid silica, an oxide of aluminum, water and hexamethyleneimine;
- (ii) maintaining said reaction mixture under sufficient crystallization conditions until crystals of layered material are formed;
- (iii) swelling said layered material of step (ii) by contacting said layered material with a suitable swelling agent, and
- (iv) pillaring the swollen material of step (iii) by contacting the swollen material with a quaternary ammonium silicate solution under conditions sufficient to pillar said swollen material.
Dependencies are inferred from the claim text.