The feasibility of adding iron compounds with the coal feed was examined as a means to capture sulfur in situ during the partial oxidation of coal in a Texaco gasifier operating in the slagging mode. Overall, our studies indicate that iron additives have good potential as sorbents for in situ desulfurization with oxygen gasification. The resultant slag is stable and has a low viscosity with good sulfur capture capability. Our data indicate that the required iron dosage decreases as the operating temperature decreases due to an increasing sulfur capture efficiency.