Ferrisilicate zeolites with MEL topology were synthesized via an in-situ feeding method. By introducing Fe species into the preheated silicalite gel, well crystallized MEL framework with Fe–Si composition was obtained. The distribution of Fe in zeolite crystals greatly depends on the valence states of Fe added into the synthesis system. Different characterization results illustrate that Fe³⁺ can behave similarly to Al³⁺ to be incorporated into zeolite framework, while Fe²⁺ can be partially incorporated into zeolite framework, combined with the formation of FeOx clusters. The substitution of Al by Fe in zeolite not only improves the hydrophobicity of zeolitic framework but also endows zeolite appropriate acidity and good catalytic oxidation property. When applied for the removal of non-methane hydrocarbon (NMHC) from cooking oil fumes (COFs), the ferrisilicate MEL zeolites present both superior NMHC adsorption capacity and high NMHC catalytic conversion rate and therefore is a good bi-functional material for VOCs purification.

通过原位进料方法合成了具有MEL拓扑的铁硅酸盐沸石。通过将Fe物种引入预热的硅沸石凝胶中，可以获得具有Fe-Si组成的结晶良好的MEL骨架。Fe在沸石晶体中的分布在很大程度上取决于添加到合成系统中的Fe的价态。不同的表征结果表明，Fe ³⁺可以与Al ³⁺相似地结合到沸石骨架中，而Fe ²⁺可以部分结合到沸石骨架中，并形成FeOx团簇。Fe在沸石中取代Fe，不仅提高了沸石骨架的疏水性，而且赋予了沸石适当的酸度和良好的催化氧化性能。当用于从食用油烟（COF）中去除非甲烷碳氢化合物（NMHC）时，亚铁硅MEL沸石既具有出色的NMHC吸附能力，又具有较高的NMHC催化转化率，因此是用于VOC净化的良好双功能材料。