Microporous amorphous mixed metal oxides for shape selective catalysis
AssigneeStudiengesellschaft Kohle mbH
InventorWilhelm F. Maier
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Abstract
The invention relates to the catalytic activity and selectivity of microporous, amorphous glasses of mixed metal oxides and the application thereof in the form of shape selective, heterogeneous catalysts. Microporous, amorphous mixed metal oxides (glasses) can be formed by polycondensation of soluble metal compounds. These new materials show a temperature stability up to 800° C. These amorphous glasses show in heterocatalytic reactions selective oxidation, hydrogenation, hydrocracking and condensation catalysis.
Claims9
A sol-gel process for preparing shape selective catalytically active amorphous, microporous glasses comprising mixed oxides, said process comprising:
- a) dissolving successively in each other to obtain a clear solution at least two hydrolyzable, liquid or dissolved compounds of the elements titanium, silicon, aluminum, zirconium or cerium;
- b) stirring the clear solution at a pH of from 0 to 7 while adding aqueous acidic catalysts or fluoride ions to effect linear polymerization or polycondensation to obtain a gel;
- c) drying the gel under mild conditions by heating at 60 to 70° C., and calcining the gel at temperatures in the range of 120 to 800° at a slow heating rate to obtain an amorphous, microporous glass.
Dependencies are inferred from the claim text.