[en] The simulation of thermochromatographic processes by the Monte Carlo method has been extended to reaction gas chromatography, governed by the surface reactions dissociative adsorption and associative desorption. The method has been applied to thermochromatographic surface reaction studies with oxide and hydroxide species of molybdenum in open tubular quartz columns. Positions and shapes of thermochromatographic zones were calculated in dependence of reaction type, humidity of the carrier gas, and exposure time and compared to experimental results. (orig.)