NOVELTY - The procedure for improving operational behavior of reformer system to adjust the natural gas treatment to hydrogen in the power requirement of polymer membrane fuel cell useful in domestic energy supply by using a catalyst on the basis of cellular metallic materials, comprises electrolytically or electrochemically coating the cellular metallic materials with a commercial nickel sulfamate electrolyte without additives at 55-60 degrees C for 15-17 minutes so that a high number of defective point and fabric anomalies consists of the cellular metallic material.    USE - The procedure for improving operational behavior of reformer system to adjust the natural gas treatment to hydrogen in the power requirement of polymer membrane fuel cell useful in domestic energy supply.    ADVANTAGE - The procedure ensures improvement of operational behavior of reformer system by maintaining a sufficient heat transfer to the gas thus minimizing operation-, investment- and maintaining cost of the reformer system and minimizing the requirement of active components.    DETAILED DESCRIPTION - The procedure for improving operational behavior of reformer system to adjust the natural gas treatment to hydrogen in the power requirement of polymer membrane fuel cell useful in domestic energy supply by using a catalyst on the basis of cellular metallic materials, comprises electrolytically or electrochemically coating the cellular metallic materials with a commercial nickel sulfamate electrolyte without additives at 55-60 degrees C for 15-17 minutes so that a high number of defective point and fabric anomalies consists of the cellular metallic material. The coating is carried out under potentiostatic condition and the cell is imprinted between working electrode and reference electrode with a constant potential difference of 3 Volt. An INDEPENDENT CLAIM is included for a catalyst for improving operational behavior of reformer system.    DESCRIPTION OF DRAWING(S) - The figure shows a reformer unit of reformer system (Drawing includes non-English language texts).