MICROPOROUS CRYSTALLINE SILICOALUMO PHOSPHATES, METHOD OF PREPARATION THEREOF AND CATALYST FOR SYNTHESIS OF OLEFINS FROM METHANOL Russian patent published in 1997 - IPC

FIELD: chemical industry. SUBSTANCE: product from reactive SiO₂, Al₂O₃ and P₂O₅ and matrix organic material is prepared by mixing Al₂O₃ with P₂O₅ and hydrochloric acid followed by addition of SiO₂ and matrix material to the mixture and crystallization of the product on heating the resulting gel. Al₂O₃ and SiO₂ are used in the same molar ratios as in the desired product, and P₂O₅ is added in excess of stoichiometric amount. SiO₂ to hydrochloric acid ratio is 0.3-3.0. The desired product has improved resistance to deactivation by coking. EFFECT: more efficient preparation method. 8 cl, 7 tbl