Process for the synthesis of a silica enriched crystalline alumi

Chemistry of inorganic compounds – Zeolite – Isomorphic metal substitution

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423705, 423DIG38, 502 85, 502 86, 502 77, C01B 3930

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055342396

ABSTRACT:
Process for the synthesis of a silica-enriched crystalline aluminosilicate having the offretite structure from a nucleation gel A containing sources of silicon, aluminium, alkali metal ions, an organic structuring agent and water and a growth gel B containing sources of silicon, aluminium, alkali metal ions and water. The crystals formed are calcined, the ions are replaced by protons and the crystals are subjected to a hydrothermal treatment followed by a treatment with a strong mineral acid. The aluminosilicate formed has a good selectivity in acid catalysis reactions and is characterized by its good stability.

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patent: 4834961 (1989-05-01), Fajula et al.
patent: 4840930 (1989-06-01), La Pierre et al.
patent: 4994250 (1991-02-01), Occelli

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