| abstract |
Zeolitic adsorbent comprising at least one FAU zeolite of nested porosity, that is, it has both micropores and mesopores at the same time and it comprises barium or barium and potassium, zeolitic adsorbent for which: - the external surface, measured by nitrogen adsorption and calculated by the t-plot method from the nitrogen adsorption isotherm at a temperature of 77K, after degassing under vacuum, that is, under a pressure P <6.7 10-4 Pa, at a temperature comprised between 300 ° C and 450 ° C for a period of 9 hours to 16 hours, it is greater than 20 m2.g-1, preferably greater than 30 m2.g-1, and more preferably it is still between 30 m2 .g-1 and 200 m2.g-1, and in particular it is between 30 m2.g-1 and 150 m2.g-1, said external surface being associated with a population of mesoporos of average diameter between 2 nm and 50 nm, and - the non-zeolitic phase content is between 6% and 12% by weight referred to the total weight of the adsorbent, preferably between 6% and 11% by weight referred to the total weight of the adsorbent, more preferably still, between 6% and 10%, by weight based on the total weight of the adsorbent. |