KINETIC MODELING OF THE HYDROLYSIS OF CARBON-DISULFIDE CATALYZED BY EITHER TITANIA OR ALUMINA

The reaction rates for the hydrolysis of CS2 on either alumina (Kaiser 201) or titania (CRS 31) were measured at 150 kPa and from 270 to 330 degrees C using a laboratory Berty reactor over ranges of water conce ntration (2-12 mol%) and CS2 concentration (0.5-2 mol%). Four mechanis m-related model functions were tested in the search for the best-fitti ng rate function by using non-linear regression techniques. The result s show that the Eley-Rideal rate function best-fitted the kinetics usi ng either Kaiser 201 or CRS 31 with different parameters. The kinetic parameters obtained confirm that CRS 31 appears to have the higher act ivity of the two catalysts for CS2 hydrolysis. The strong adsorption o f water vapor on each of the two catalysts studied inhibits the hydrol ysis rate and affords an effective reaction order close to zero for H2 O, possibly by saturating the catalysis surface and reducing the fract ion of catalyst surface available for CS2 and COS adsorption.