Synthesis of Heterocoordinated Atom-Containing Zeotypes Utilizing a Mechanochemical Reaction

A novel series of zeotypes, in which alkaline-earth metal atoms were introduced into a silicate framework, were successfully synthesized by utilizing a mechanochemical reaction. In the synthesis method developed in this study, an alkaline-earth metal hydroxide and silica were allowed to react mechanochemically in the solid phase, and the resulting uniformly mixed precursor was treated hydrothermally in an aqueous alkaline solution. AES-1, one of the materials obtained by this method, was analyzed in detail, and it was elucidated that the material had the same topology as a synthetic calcosilicate CAS-1 with a two-dimensional eight-membered ring micropore system and zeolitic physicochemical properties. Several unknown materials have been synthesized by this method to demonstrate the validity of the incorporation of alkaline-earth metals for the synthesis of novel microporous materials.