SELECTIVE PHENOL ADSORPTION FROM HYDROCARBON FOR ULTRA-CLEAN BIOFUEL
Résumé
The purification of biofuels becomes a challenging issue because of the harmfulness of remaining phenolic molecules for human health and engines. To this end, protonic Y zeolites with different Si/Al ratios and mesoporous materials were explored as effective adsorbent materials to remove phenol from isooctane solution. Phenol was selectively removed from isooctane over HY and HUSY zeolites with a maximal adsorption capacity of 2.2 mmol.g-1. The adsorption equilibrium was reached faster over dealuminated zeolites, due to the presence of large pores at the expense of microporosity as well as a low density of acidic sites. We further evidence that the presence of acid sites limits the regeneration capacity since phenol strongly adsorbed on both Brønsted and Lewis acid sites. The USY zeolite with the highest Si/Al ratio presents the best regeneration capacity because of itslower aluminum loading, although is not performing in presence of toluene. The solid gathering the best performances regarding both selective adsorption and regeneration is the HY2.9.
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