Decarbonization of Polluted Air by Solar‐Driven CO₂ Conversion into Ethanol Using Polarized Animal Solid Waste as Catalyst

Abstract CO₂ conversion to added value products using green processes in terms of source of energy, energy consumption, and/or management of raw materials obtained from waste materials are very attractive approaches for a modern sustainable society. In this work, such approaches are integrated, converting CO₂ into ethanol by using polluted air as feeding gas. More specifically, recycled permanently polarized hydroxyapatite catalysts are prepared by applying a thermally stimulated polarization process to pork, beef, and chicken scrapped bones. The recycled bone catalysts are used to perform a series of reactions fed with polluted air and only powered with solar energy using a solar furnace. Reactions are conducted for 5 days and 1 month. Results demonstrate significant decarbonization, converting CO₂ into valuable chemical products with high selectivity toward ethanol (up to 99.6%).