Abstract
A series of Zn, Ni and Fe containing hydrotalcite-like compounds with various M 2+/M 3+ ratios were synthesized by co-precipitation method at pH = 10. The products were characterized by XRD, SEM, TG-DTA, FTIR, CO 2-TPD and N 2 adsorption/desorption techniques. The results showed that M 2+/M 3+ ratio affected the formation of hydrotalcite crystal seriously. The precursors with M 2+/M 3+ 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 M 2+/M 3+ mole ratio was 3.
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