Low-temperature preparation of cupric spinel for room-temperature removal of hydrogen sulfide to value-added product ammonia formation

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.