407.    BUNTE, K., AND GIESSEN, A.  [Influence of Coke Reactivity on Water-Gas Formation.]  Gas-u. Wasserfach, vol. 73, 1930, pp. 241-247; Chem. Abs., vol. 24, 1930, p. 2862.

                  Experimental results indicate that the reactivity of various cokes with respect to water vapor decreases in the following order:  Wet-quenched, low-temperature lignite coke; wood charcoal; dry-quenched, low-temperature lignite coke; semicoke; wet-quenched gas coke; dry-quenched gas coke and oven coke.  This is in the same order as determined for O₂ alone and O₂ in CO₂ (bibliography given).  Some relationship can be noted between water-vapor decomposition and ignition temperature of the coke, but this is obscured by the effect of undecomposed steam passing through the fuel bed on the water-gas equilibrium in the gaseous phase.  This effect is difficult to evaluate as it is practically impossible to draw gas samples directly from the fuel surface, and, in addition, equilibrium is not reached in the water-gas reaction, even at the higher temperatures.