Spinel-type compounds are extremely effective in the adsorptive removal of gas pollutants. However, they are prepared at high temperatures, and their lack of catalytic production of value-added products deserves further research. This study focused on the preparation of cupric spinel compounds at low temperatures and their application to H2S removal with value-added product formation. Cupric spinel (CuFe2O4) was prepared by the co-precipitation of bivalent copper and trivalent iron at 60 °C, which allowed the formation of CuFe2O4 with a high surface area of 202.72 m2/g. The obtained breakthrough capacity was 5.68 mg H2S/g in ambient temperature removal of H2S. The analysis of outflowing gas by online sensor demonstrated the formation of 73.75 mg NH3/g spinel compound. The sulfide compound presented in the sample analysis supported the NH3 formation at the end of H2S removal, that is, NH3 was synthesized at ambient temperature after the formation of sulfide compound. Successfully prepared the CuFe2O4 at a low temperature and its application on H2S removal with value added product NH3 formation achieved at ambient temperature. SYNOPSIS: Spinel oxide prepared low temperature for an ambient condition removal of H2S under dry humidity to synthesis value added byproduct. Display omitted •Naturally abundant cupric spinel (CuFe2O4) prepared at 60 °C without calcination.•Ambient temperature adsorptive removal of H2S with 5.68 mg H2S/g breakthrough capacity.•Ambient temperature generation of 73.75 mg NH3/g from H2S removal without external energy.