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

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.

Automated summary

The redox-triggered microporosity change in zeolitic iron molybdate is investigated, and it is found that the micropores of the material can be adjusted by redox reactions, enabling tuning of the adsorption and separation performance.