Redox-induced control of microporosity of zeolitic transition metal oxides based on ε-Keggin iron molybdate at an ultra-fine level

Abstract

Tuning the microporosity of crystalline microporous materials is critical for achieving good application performance. Zeolitic iron molybdate shows both redox properties and microporosity, and a redox-triggered microporosity change is investigated. The micropores of the material are adjusted at the sub-atomic scale by redox reactions, enabling tuning of the adsorption and separation performances of the material based on the redox of the material. The adsorption capacities of CO₂ and CH₄ increase and decrease with the reduction and oxidation of the material, respectively. The separation performance for CO₂/CH₄ of the material is enhanced and weakened when the material is reduced and oxidized. The robust material is able to separate CO₂/CH₄ at high temperatures and humidities and can be reused without changing the structure.