Abstract
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.
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