| abstract |
The invention relates to a method for isomerising dehydration in the presence of a specific catalyst, to produce at least one alkene. The method is carried out on a feedstock comprising a non-linear primary monoalcohol, taken alone or in a mixture. The catalyst comprises at least one zeolite having at least one series of 8MR channels and comprises a binder, preferably a silicic binder, having a pore volume of between 0.5 and 0.9 ml/g. The catalyst is multilobe-shaped and has an average mesopore volume Vm centred at an approximate 20% around the value defined by the formula Vm = - 0.004Tz + 0.505, the mesopores having a diameter between 3.6 nm and 50 nm, an average macropore volume VM centred at an approximate 20% around the value defined by the formula VM = 0.0101Tz – 0.5375, the macropores having a diameter greater than 50 nm and less than 7000 nm, an average micropore volume Vμ centred at an approximate 20% around the value defined by the formula Vµ = 0.0014Tz – 0.0006, the micropores having a diameter of less than 2 nm, in the formulas, Tz being the weight content of zeolite in the catalyst, expressed in %wt, and the pore volumes being expressed in ml/g. The catalyst has an exposed geometric area of 2700 to 11000 m2/m3 of catalyst bed volume. |