Synthesis of large pore zeolites and zeotypes

Details Synthesis of large pore zeolites and zeotypes Synthesis of large pore zeolites and zeotypes

C - Chemistry, Metallurgy

01

B

C01B 37/00 (2006.01) B01J 29/035 (2006.01) B01J 29/04 (2006.01) B01J 29/70 (2006.01) B01J 29/89 (2006.01) C01B 37/02 (2006.01) C01B 39/48 (2006.01)

Patent

CA 2286010

The invention relates to methods for the synthesis of large pore zeolite materials which are related structurally with the Beta zeolite, characterized by the relatively low pH of the synthesis medium and the use of F- anions as mineraliser; it also relates to the materials thus obtained which are characterized by their very high thermal stability, low concentration of defects SiO- or SiOH, wide range of chemical composition, large pore and because their calcination enables to obtain the acid form without the use of cationic exchange process. Although said materials are related with Beta zeolite, they present occasionally substantial differences with respect to the Beta zeolite. Also claimed is the use of the material obtained in catalytic process of transformation of hydrocarbons and in oxidation process. The method comprises heating at 363-473K a reaction mixture which contains a source of at least one tetravalent element T(IV), optionally a source of an element T(III), optionally H2O2, a structure-director organic cation, a source of anions F- and water; the presence of alkaline cations is not necessary.

L'invention concerne des procédés de synthèse de matériaux zéolitiques à grand pore associés de manière structurelle à la zéolite Béta et caractérisés par le pH relativement bas du milieu de synthèse et par l'utilisation d'anions F?-¿ comme agent de minéralisation. L'invention concerne en outre les matériaux ainsi obtenus caractérisés par leur très haute stabilité thermique, leur faible concentration de défauts SiO?-¿ ou SiOH, leur large plage de composition chimique, leur grand pore et caractérisés en ce que leur calcination permet d'obtenir la forme acide sans avoir recours à des processus d'échange cationique. Ces matériaux, quoiqu'ils soient associés à la zéolite Béta, présentent parfois des différences considérables par rapport à celle-ci. L'invention concerne aussi l'utilisation du matériau obtenu lors de processus catalytiques de transformation d'hydrocarbures et lors de processus d'oxydation. Le procédé consiste à chauffer à une température allant de 363 à 473K un mélange réactionnel contenant une source d'au moins un élément tétravalent (T(IV), éventuellement une source d'un élément T(III), éventuellement H¿2?O¿2?, un cation organique structurant, une source d'anions F?-¿ et de l'eau, la présence de cations alcalins n'étant pas nécessaire.

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