Abstract
Isomorphously substituted Co(Mn)-Beta zeolites were directly synthesized through a static hydrothermal approach. The silica-metal precursor was prepared by co-hydrolysis of tetraethylorthosilicate with cobalt or manganese nitrates in acidic media, which was adjusted to the strong basic condition by adding the structural directing agent (tetraethylammonium hydroxide) and Al source (sodium aluminate) for the subsequent hydrothermal crystallization. The products were characterized by X-ray diffraction, inductively coupling plasma elemental analysis, Brunauer–Emmett–Teller surface area, nitrogen sorption isotherm, FT-IR, UV–vis, and SEM. The results show that Co or Mn ions are incorporated into the framework of zeolite Beta, and the thus obtained Co(Mn)-Beta zeolites are nano-structured zeolite crystallites. The acidic co-hydrolysis/considention is proposed to facilitate the formation of metal-bearing nucleus for growing Co(Mn)-Beta crystals.
Published Version
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