▎ 摘　　要

NOVELTY - Preparing ferric oxide composite desulfurizer, comprises oxidizing the carbon-based material to obtain an oxidized carbon-based material, mixing the oxidized carbon-based material with a precursor of ferric oxide and a precursor of calcium oxide to obtain a first reactant, allowing to stand the first reactant to obtain a second reactant, and calcining the second reactant under an inert atmosphere to obtain ferric oxide composite desulfurizer in which calcium oxide and ferric oxide are co-supported on the carbon-based material. USE - The ferric oxide composite desulfurizer is used to remove hydrogen sulfide in the gas in an oxygen-free atmosphere at room temperature (claimed). ADVANTAGE - The preparation method does not need additional solvent, the preparation process is simple, green, economical and environment-friendly, and improves the desulfurization efficiency of ferric oxide in oxygen-free atmosphere at normal temperature due to the presence of calcium oxide (e.g. forming a heterogeneous interface on surface-based material). The method uses the combined water in the water-soluble iron salt to dip the iron salt into the pore canal of the carbon base material, without adding solvent. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an ferric oxide composite desulfurizing agent. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating the method for preparing ferric oxide composite desulfurizer to remove hydrogen sulfide in gas in oxygen-free atmosphere at room temperature (Drawing includes non-English language text).