COMPOSITION OF MIXED OXIDES AND METHOD OF PRODUCING ISOOLEFINS Russian patent published in 2016 - IPC B01J21/12 C07C1/20 B01J23/02 C07C1/24 

FIELD: chemistry.

SUBSTANCE: invention discloses catalyst for decomposition of alkyl-tert-alkyl ethers or tertiary alcohols, their application as catalyst for decomposition of alkyl-tert-alkyl ethers or tertiary alcohols, as well as method of decomposing alkyl-tert-alkyl ethers or tertiary alcohols to iso-olefines and alcohol or water. Catalytically active component in catalyst is represented by compound of mixed oxides containing powder of mixed oxides of aluminium and silicon oxides of alkali or alkali-earth metals. Powder of silicon-aluminium mixed oxides is mainly or fully represented in form of aggregated primary particles, where: a) weight ratio (Al₂O₃/SiO₂)_ttl in total primary particle ranges from 0.002 to 0.05, b) weight ratio (Al₂O₃/SiO₂)_surface of primary particles in close to surface layer with thickness about 5 nm is less than in total primary particle, and c) BET surface area ranges from 50 to 250 m²/g.

EFFECT: defined powders of mixed oxides containing silicon and aluminium, during production of which flame-hydrolytic or pyrogenic mixed silicon-aluminium oxide is used, have high catalytic activity when decomposing alkyl-tert-alkyl ethers or tertiary alcohols to iso-olefine, as well as alcohol, water, respectively, and at the same time catalyse formation of very low amounts of undesirable by-products.

11 cl, 4 tbl, 6 ex