Resumen
[0001] The present invention relates to zeolithic materials having a characteristic X ray diffraction pattern, and its preparation method, characterized by the relatively low pH of the synthesis medium and the use of F<-> anions as mineralizing agent. The invention also claims the use of the obtained material in catalytic processes for the transformation of hydrocarbons and in oxidation process. The method comprises heating at 363-473 °K a reaction mixture which contains a source of at least one tetravalent element T(IV), optionally a source of an element T(III), optionally H<2>O<2>, a structure director organic cation, a source of anions F<-> and water; the presence of alkaline cations is not necessary.
Reivindicaciones
1. A micro-porous material with an X-ray diffraction pattern coinciding with those given in figures 1 and 2, Tables 1 and 2. 2. A material according to claim 1 whose composition, in their roasted anhydride state corresponds to the empirical formula x(HXO<2>):TO<2> where T is one or several tetravalent elements (Si, Ge, Ti, V, ...), X is a trivalent element (Al, Ga, Fe, B, Cr, ...), and x has a value less than 0.5, this value can be 0. 3. A micro-porous material according to claims 1 and 2 in which the empirical formula of the roasted and anhydrous material is x(HXO<2>):gGeO<2>:SiO<2> where the ratio Si/Ge is greater than 2, X is a trivalent cation and the ratio (Si + Ge)/X is greater than 5. 4. A micro-porous material according to claims 1 and 2 in which the empirical formula of the roasted and anhydrous material is x(HXO<2>):gGeO<2>:tTiO<2>:SiO<2> where the ratio Si/Ge is greater than 2, X is a trivalent cation, the ratio (Si + Ge)/X is greater than 5 and the ratio (Si + Ge)/Ti is in the range 10 to 10000. 5. A micro-porous material according to claim 1 in which the empirical formula of the roasted and anhydrous material is x(HXO<2>):gGeO<2>:tTiO<2>:SiO<2> where the ratio Si/Ge is greater than 2, X is a trivalent cation, the ratio (Si + Ge)/X is greater than 5, T is a tetravalent cation different from Si and Ge and the ratio (Si + Ge)/T is in the range 10 to 10000. 6. A method for synthesising the zeolite of claims 1, 2 and 3, characterised by not requiring the presence of alkali cations in the synthesis mixture and by using F anions, tetraethylamonium cations and a low pH. The mixture has a composition, in terms of molar ratio, lying within the ranges H<2>O/(SiO<2> + GeO<2>) = 4 - 50, preferably 4 - 20, more preferably 4 - 8 (SiO<2> + GeO<2>)/X<2>O<3> = 10 - 8, preferably > 14 TEA/(SiO<2> + GeO<2>) = 0.125 - 0.80, preferably 0.15 - 0.72 F/(SiO<2> + GeO<2>) = 0.1 - 2, preferably 0.1 - 0.8 where X is a trivalent element, and the pH after crystallisation lies in the range 6 - 12, preferably 8 - 9.5. 7. A method for preparing zeolites according to claims 1, 2, 4 and 5, containing Ti, Cr or V and with an X-ray diffraction pattern essentially similar to that shown in figure 1 in which the mixture has a composition, in terms of molar ratio, lying within the ranges H<2>O/(SiO<2> + GeO<2>) = 4 - 50, preferably 4 - 20, more preferably 4 - 8 TO<3>/O - 0.25, preferably, 0.01 - 0.05 (SiO<2> + GeO<2>)/X<2>O<3> = 10 - 8, preferably 100 - 8, more preferably > 1000 TEA<+>/(SiO<2> + GeO<2>) = 0.125 - 0.80, preferably 0.15 - 0.72 F/(SiO<2> + GeO<2>) = 0.1 - 2, preferably 0.1 - 0.8 H<2>O<3>/F = 0 - 50, preferably 0 - 20 where T is Ti, Cr or V, X is a trivalent element and where the pH, after crystallisation, lies in the range 6 - 12, preferably 8 - 9.5. 8. Use of the zeolite of the previous claims as a catalyst in processes of cracking, hydrocracking, gentle hydrocarbon and/or functionalised hydrocarbon cracking, hydroisomerisation of directly distilled petrols, deparaffining and iso-deparaffining, alkylation of iso-paraffins and olefins and alkylation of aromatics with olefins and alcohols and more specifically the production of cumene by alkylation of benzene with propylene. 9. Use of the zeotypes containing Ti, Cr or V according to claims 1, 2, 4, 5, 6 and 7 as a catalyst in processes of selective oxidation of organic compounds using H<2>O<2> or peroxides or organic hydroperoxides.
