Abstract
The kinetics of the water gas shift reaction was studied under noncatalytic conditions in supercritical water at CO/H 2O ratios of 0.03 and at temperatures from 653 to 713 K. The selectivities of CO 2 and hydrogen were almost equal and did not change with pressure at 673 K. The increase of pressure and water density sensitively promoted the reaction at 653 K from 25 to 30 MPa whereas the pressure and water density did not seem to affect the rate constant at 673 K from 10 to 30 MPa. The first order rate constant for CO conversion was k=10 5.58±1.38 exp(−1.16±0.19×10 5/ RT) /s at 10–59.6 MPa and 653–866 K.
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