Calcined hydrotalcite-like compounds as catalysts for hydrolysis carbonyl sulfide at low temperature

Abstract

Catalytic systems based on mixed oxides catalysts derived from a series of hydrotalcite-like compounds through the coprecipitation method were investigated for hydrolysis of carbonyl sulfide (COS) in a fixed-bed reactor. The effects of pH, temperature of synthesis and hydrothermal treatment on catalytic activity were studied. Furthermore, the samples were characterized by pH titration, X-ray diffraction (XRD) and Brunauer–Emmett–Teller method (BET). The results showed that the catalysts could be prepared by precipitating solution of (Co + Ni)/Al at pH 9.0, synthetic temperature at 25 °C, and then hydrothermal treatment at 50 °C for 12 h. The XRD patterns showed the precursors had typical hydrotalcite structure and the catalysts were mixed oxides. All catalysts could be considered mesoporous.