Mesoporous zeolites prepared by alkaline treatment with precipitates
OwnerDanny VERBOEKEND, Martin D'HALLUINinventors
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Abstract
The present invention relates to processes for the preparation of mesoporous zeolites by post-synthetic technologies, the properties of resulting materials, and the use of the resulting materials as catalysts in the refining and petrochemical industry.
Claims20
A process for increasing mesoporosity in zeolites comprising the consecutive steps:
- a) preparing a suspension of a zeolite in an aqueous solution of pH<8 in which at least one salt with a ‘Acid Solubility’>95% and ‘Alkaline Solubility’<95% is dissolved;
- b) adding a base to the suspension of step a), thereby increasing the pH>8, and letting react said base in the suspension thereby increasing the mesoporosity of the zeolite;
- c) isolating the zeolite from the suspension of step b).
A zeolite with the MFI topology, an atomic Si/Al ratio of at least 60, a Vmicro,0.01 of at least 0.10 ml g−1, a Vmeso,0.2-1 of at least 0.30 ml g−1, and a Lewis acidity (L) as measured with pyridine of at least 100 μmol g−1.
A zeolite with the FAU topology, an atomic Si/Al ratio of at least 3.5, a Vmicro of at least 0.18 ml g−1, a Vmeso of at least 0.30 ml g−1, and a Lewis acidity (L) as measured with pyridine of at least 250 μmol g−1.
A process for increasing mesoporosity in zeolites comprising the consecutive steps:
- 1) contacting a zeolite in an aqueous solution of pH>8 in which at least one salt with an ‘Acid Solubility’>95% and ‘Alkaline Solubility’<95% is present;
- 2) isolating the zeolite from the suspension of step 1).
Dependencies are inferred from the claim text.