Patent ID: 6475464
Filing Date: 2002-11-05
Classification: B01J,C01B,C10G,Y10S

Abstract:
A process for preparing a zeolite with structure type MTT comprising at least one element X selected from silicon and germanium and at least one element T selected from iron, aluminium, gallium, boron, titanium, vanadium, zirconium, molybdenum, arsenic, antimony, chromium and manganese, said process comprising crystallizing a reaction mixture containing seeds of at least one zeolitic material comprising at least one element Xâ€² selected from silicon and germanium and at least one element Tâ€² selected from iron, aluminium, gallium, boron, titanium, vanadium, zirconium, molybdenum, arsenic, antimony, chromium and manganese, with an Xâ€²/Tâ€² ratio of less than 200, said seeds being different from the zeolite with structure type MTT being prepared, said reaction mixture further containing at least one organic template, said organic template being an alkylated &agr;-&ohgr; diammonium polymethylene derivative with formula: R1R2R3N+(CH2)nN+R4R5R6, and/or a degradation product of the amine corresponding to said derivative and/or a precursor corresponding to said derivative, n being in the range 3 to 14 and R1 to R6, which may be identical or different, representing alkyl or hydroxyalkyl radicals containing 1 to 8 carbon atoms; up to five R1 to R6 radicals optionally being hydrogen.