To
selectively adsorb dimethyl disulfide (DMDS) from its competition
components, such as methyl tert-butyl ether (MTBE),
the shell layer of silicalite-1 crystals was synthesized on a commercial
Y zeolite crystal surface (CuYH@silicalite-1 core–shell
structured composites) with a mass composition of tetraethyl orthosilicate/tetrapropylammonium
hydroxide/ethanol/H2O/CuYH = 20 g (0.096 mol):19
g (0.0234 mol):17 g (0.369 mol):87 g (4.829 mol):5 g. CuYH zeolites were acquired by ion-exchanging Cu2+ with HCl-treated
NaY (noted as NaYH). Results showed that by the dealuminization
of HCl, the ratio of Si/Al for NaY zeolites was dramatically increased,
providing NaYH a favorable condition for growth of silicalite-1
coatings, and many vacancies left by dissolved Al also enlarged the
outside surface area of NaYH to provide more load locations
for silicalite-1 crystals. Among all these synthesized adsorbents,
the core–shell YH–CuCl2 displayed
the best DMDS adsorption of approximately 34.585 mgs/gadsorbent in MTBE solution and a 100% desulfurization rate
for approximately 3 h. Also, the process of synthesizing CuYH@silicalite-1 core–shell composites and their shape-selective
adsorption were detailed.