Abstract
NaOH treated silicalite-1/CuYOH core–shell composites were synthesized at the mass ratio of tetraethyl orthosilicate (TEOS)/tetrapropylammonium hydroxide (TPAOH)/ethanol/H2O/CuY = 20 g (0.096 molar):19 g (0.0234 molar):17 g (0.369 molar):87 g (4.8293 molar):5 g to achieve the selective adsorption desulfurization of dimethyl disulfide (DMDS) from methyl tert-butyl ether (MTBE). As the core zeolite, CuY was obtained by Cu2+ ion-exchange on NaY. After alkali treatment, NaY zeolite was provided with more loading positions for silicalite-1 crystals owing to the desilication effect of NaOH. Results showed that the core–shell YOH-CuCl2 displayed the best performance in desulfurizing DMDS from MTBE with a sulfur adsorption capacity of 37.073 mgs/gadsorbent for the sake of its significant mass gain and compact silicalite-1 coatings. The preparation of silicalite-1/CuYOH core–shell composites and the shape selective adsorption mechanism of desulfurizing DMDS on these core–shell composites were expounded.
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