MTT zeolite comprising crystals and crystal aggregates with specific granulometries, and its use as a catalyst for isomerising straight chain paraffins

摘要

The invention concerns a zeolite with structure type MTT comprising MTT zeolite crystals with a size of less than 5 mum, at least a portion of the MTT zeolite crystals being in the form of MTT zeolite crystal aggregates, said zeolite being characterized in that the granulometry of the aggregates is such that the dimension Dv,90 is in the range 40 nm to 100 mum. The invention also concerns the preparation of the zeolite and the use of the zeolite as a catalyst in a process for converting hydrocarbon feeds, and in particular in a process for isomerising straight chain paraffins molecular sieve formed from an MFI, MEL or beta type zeolite by means of the crystallisation temperature It should be noted that these prior art patent applications never mention the specific size of the zeolite crystals and aggregates in combination with particular catalytic properties.