A method to generate a ternary carburizing gas mixture, using a reaction of selective hydrogenation of acetylene in a stream of hydrocarbons to the form of ethylene, comprising the following steps: heating of the inside of the reactor with an inert gas to an operating temperature for a period of 20 minutes at a temperature of 300° K, passing a mixture of hydrogen and acetylene by the regiospecific catalyst, and moving out the reaction products on the outside after passing the mixture through the regiospecific catalyst, but generation is effected in a continuous mode in the operating temperature range of the regiospecific catalyst between 293° K and 398° K, preferably at a temperature of 350° K.