Study of the catalyst for hydrolysis of carbonyl sulfide used in the coal gasification plant

The reaction rate constant of carbonyl sulfide over a titanium oxide-based catalyst, CRS 31 (Axens), was measured using a fixed-bed reactor at temperatures from 393 to 473 K. The conversion of carbonyl sulfide by hyrolysis over CRS 31 was 0.9 at 393 K, 2.6% H₂O. The hydrolysis of carbonyl sulfide over CRS 31 was a firstorder reaction with a rate constant of 3.3 s^-1 at 433 K, 2.6% H₂O. The resistance to HCl of CRS 31 was superior to that of aluminum oxide-based catalysts. In experimental apparatus consisting of a gasfier operating under atmospheric pressure, a water scrubber, and COS converters, the performance of CRS 31 was evaluated by use of syngas. The conversion of carbonyl sulfide by hydrolysis over CRS 31 was 0.98 at above 453 K with a residence time of 1 s.