Structure material of the zeolite type with ultralarge pores...

Details Structure material of the zeolite type with ultralarge pores... Structure material of the zeolite type with ultralarge pores...

B - Operations, Transporting

01

J

B01J 29/70 (2006.01) B01J 29/89 (2006.01) C01B 39/00 (2006.01) C07D 301/12 (2006.01)

Patent

CA 2142336

The invention relates to a material comprised of silicotitanates having a crystalline structure similar to MCM-41 zeolites, said material being characterized in that it contains in its lattice atoms of titanium and channels in its porous structure whose average sizes exceed 10 .ANG., making possible its utilization in catalytic reactions wherein are involved large organic molecules, such as the oxidation of olefins to epoxides and glycols, alcohols to cetones, thioethers to sulfoxides and sulfones, and phenol to catechol and hydroquinone, and if A1 is introduced into the structure it is then possible to prepair bifunctional catalysts "oxidant- acid/base". In order to obtain such product, and aqueous solution is used which contains the ion NR1R2R3R4+ as well as another aqueous solution which contains tetramethyl amonium hydroxide and a silica source (e. g. aerosil). After homogenization, more silica is added, as is the Ti source [e.g. Ti(C2OH3)4). The resultant gel is heated in an autoclave at a temperature between 80 and 200 °C. The obtained gel is activated by roasting between 350 and 800 °C. It is used for catalytic oxidation.

L'invention concerne un matériau constitué de silicotitanates ayant une structure cristalline semblable aux zéolites de type MCM-41, ce matériau se caractérisant en ce qu'il contient dans son réseau des atomes de titane et des canaux dans sa structure poreuse dont les dimensions moyennes dépassent les 10 ANGSTROM , ce qui lui permet de catalyser des réactions dans lesquelles sont impliquées des molécules organiques volumineuses, comme l'oxydation d'oléfines en époxydes et en glycols, des alcools en cétones, des thioéthers en oxydes sulfoniques et sulfones, et le phénol en catéchol et en hydroquinone, et si l'on introduit Al dans la structure il est alors possible de préparer des catalyseurs bifonctionnels "agent d'oxydation-acide/base". Pour obtenir ce produit, on part d'une solution aqueuse qui contient l'ion NR1R2R3R4<+> et d'une autre solution aqueuse contenant de l'hydroxyde de tétraméthyle amonium et une source de silice (p.ex. aérosil3). Après homogénéisation, on ajoute davantage de silice ainsi que la source de Ti[p.ex. Ti(C2OH5)4]. Le gel résultant est chauffé dans un autoclave à une température comprise entre 80 et 200 DEG C. Le gel obtenu est activé par calcination entre 350 et 800 DEG C. On l'utilise pour l'oxydation catalytique.

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