Catalytic hydrolysis of HCN over Fe-Ti-O-x catalysts prepared by different calcination temperatures: Effect of Fe chemical valence and Ti phase

摘要

A series of Fe-Ti-O-x catalysts calcined at different temperatures (signed as Fe-Ti-x, and x symbolized the calcination temperature of 300, 400, 500, 600 and 700 degrees C, respectively) were prepared and studied for the catalytic hydrolysis of HCN in the presence of H2O. The results implied that Fe-Ti-4 (the calcination temperature was 400 degrees C) showed the best catalytic hydrolysis efficiency of HCN and the abundant productions (CO and NH3). With the calcination temperature increasing, the catalytic hydrolysis of HCN activity decreased dramatically, which was related to the reduction of specific surface areas and redox property, the formation of rutile TiO2 and decline in quantity of Fe2+ species. Besides, Pe-Ti-O-x catalysts with amorphous states of TiO2 could enhance catalytic hydrolysis of HCN, which depended on the effect of calcination temperature during the preparation process of Fe-Ti-O-x catalysts.