Characterization of Zn-Ni-Fe hydrotalcite-derived oxides and their application in the hydrolysis of carbonyl sulfide

A series of Zn, Ni and Fe containing hydrotalcite-like compounds with various M2+/M3+ ratios were synthesized by co-precipitation method at pH=10. The products were characterized by XRD, SEM, TG-DTA, FTIR, CO2-TPD and N2 adsorption/desorption techniques. The results showed that M2+/M3+ ratio affected the formation of hydrotalcite crystal seriously. The precursors with M2+/M3+ mole ratio of 2 and 3 showed pure hydrotalcite phase. After calcination at 250°C, the derived oxides with larger surface area and more basic sites were obtained. Desulfurization tests showed that the Zn–Ni–Fe hydrotalcite-derived oxide exhibited an excellent activity in low temperature hydrolysis of COS. The optimum M2+/M3+ mole ratio was 3.