Process for the synthesis of a zeolite of MTT type, products obtained and their application in adsorption and catalysts
AssigneeSociete Nationale Elf Aquitaine
InventorsDi Renzo Di R Francesco, Fajula Francois, Des Courieres Thierry, Anglerot Didier
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Abstract
Process for the synthesis of a zeolite of MTT type in the absence of any nitrogenous organic agent, from a reaction mixture containing water, a source of tetravalent silicon and ethanol and optionally a source of trivalent aluminium and a source of hydroxide ions. The products obtained after heating the zeolite in air to 70.degree.-120.degree. C. or washing with water at 60.degree.-90.degree. C. are useful as selective organophilic adsorbents or as catalysts for the conversion of hydrocarbons.
Claims25
Process for the synthesis of a zeolite of an MTT structure which comprises forming a nitrogen template-free reaction mixture of water, a source of tetravalent silicon and ethanol, maintaining this mixture at a temperature above 80.degree. C. and at a pressure at least equal to the autogenous pressure for a sufficient period for the crystallization of the reaction mixture as a precursor of zeolite to occur and converting the precursor into zeolite by removal of the ethanol and of the water of hydration of cation.
Precursor of zeolites of an MTT structure, wherein its composition, expressed in moles of oxides, corresponds to
- a M.sub.2/n O. b Al.sub.2 O.sub.3. SiO.sub.2. c H.sub.2 O. d EtOH
- where
- n=1 or 2
- M is chosen from the group consisting of the alkali metals of group IA of the Periodic Classification of elements, the alkaline-earth metals and quaternary ammoniums and
- a ranges from 0 to 0.1
- b ranges from 0 to 0.1
- c ranges from 0 to 1
- d ranges from 0 to 1
- and in that its X-ray diffraction pattern is described in Table 3.
A method for the production of a zeolite of an MTT structure which is useful as an organophilic adsorbent or a catalyst for the catalytic conversion of hydrocarbons, which comprises drying a precursor of a zeolite having an MTT structure of a composition having a formula expressed in moles of oxide, corresponding to (a) M.sub.2/n O (b) Al.sub.2 O.sub.3, SiO.sub.2, (c) H.sub.2 O (d) EtHO where
- M is chosen from the group consisting of the alkali metals of group IA of the Periodic Classification of elements, the alkaline-earth metals and quaternary ammoniums and
- a ranges from 0 to 0.1
- b ranges from 0 to 0.1
- c ranges from 0 to 1
- d ranges from 0 to 1
- with air at 70.degree.-120.degree. C. or by washing said precursor with water at 60.degree.-90.degree. C.
Dependencies are inferred from the claim text.