| abstract |
The invention in a first embodiment relates to a process for the preparation of a phosphorus-modified zeolite comprising the steps of: a) providing a zeolite comprising at least one ten-membered ring in the structure, optionally steaming said zeolite, b) mixing The above zeolite of step a) and at least a component selected from the group consisting of one or more binders and shaping additives, and then shaping the mixture, c) optionally ion exchange, d) optionally steaming the shaped catalyst, This step is optionally carried out before step c), at least one of the steaming of step d) and the steaming of step a) above, e) introducing phosphorus onto the catalyst to introduce at least 0.1% by weight Phosphorus, the above introduction is carried out by dry impregnation or chemical vapor deposition, f) introducing a metal, the step optionally being carried out simultaneously with step e), g) optionally washing the above catalyst, h) optionally calcining the above catalyst, i ) steaming the above catalyst, this step is also referred to as the equilibration step. In a second embodiment, phosphorus can be introduced by any means and in step i) the steaming strength (X) is at least about 2. In the second embodiment described above, the above catalyst is advantageously steamed at a temperature in the range of more than 625 ° C, preferably in the range of 700 to 800 ° C. The metal of step f) is advantageously calcium. The invention further relates to the use of the above catalysts for the dehydration of alcohols, the cracking of olefins to produce lighter olefins, MTO and the alkylation of aromatics with olefin-containing alcohols and/or alcohols. |