Sodium/lithium 3d transition metalates for chemisorption of gaseous pollutants: a review

Sodium/lithium transition metalates have found tremendous potential as cathode materials for Na/Li batteries. These metalates have acid-base and redox characteristics, which could be utilized for the chemisorption of gaseous pollutants. Their use was focused mainly on CO2 gas chemisorption at elevated temperatures. In recent years, these materials have found interesting applications in the chemisorption of CO, NO, SO2, and H2S gases. Some of these alkali ceramics have shown tremendous potential for the wet-oxidative removal of acidic gases, even in ambient conditions. The review presents an up-to-date account of alkali ceramics of 3d transition metals for the chemisorption of toxic gases, including CO2, CO, NO, SO2, and H2S. To the best of our knowledge, Na/Li 3d transition metalates have never been reviewed in the context of air decontamination, which needs to be presented to the readers for air purification applications. •For the first time, sodium/lithium 3d transition metalates have been reviewed for the chemisorption of toxic gases.•Alkali ceramics are mid-to-high temperature captors for CO2, CO, and NO gases.•Basic sites and redox properties in alkali ceramics are beneficial for H2S and SO2 mineralization.•Some alkali ceramics could simultaneously catalyze H2 production reaction and capture the byproduct COx.