Nanosized titania and zirconia as catalysts for hydrolysis of carbon disulfide

摘要

Nanosized titania and zirconia were prepared by different ways and used as catalysts for CS_2 hydrolysis.The hydrolysis activity of the nanosized oxide catalysts is much higher than that of commercial nanosized gamma-Al_2O_3 with coparable specific surface area and grain size.The temprtures of 90% conversion of CS_2 (T_90) on nanosized titania and zirconia are 210 and 205 deg C,respectively,which are 130-135 deg C lower than that on gamma-Al_2O_3.CO_2-TPD,TG and IR studies show that the enhanced activity is due to reduced surface hydrophilicity and increased ree surface basic hydroxyl groups on the catalysts.The presence of potassium as a promoter on titania catalyst increases its hydroysis activity,but the promoted catalyst deactivates fasteron stream due to catalyst sulfation caused by a trace amount of O_2 impurity in the feed.