The present invention relates to a method for producing the prepared gas mixture to decompose thermal contact with the initial mixture comprising a hydrocarbon compound containing hydrogen on the catalyst that can be at least one hydrocarbon compound and the catalyst to form the on-carbon nanotube upon contact and relates to a plant for this purpose, the method uses two or more sequential catalytic reaction zone, the zone is or are separated in the different two or more continuous reactors, or continuously in the same reactor and catalytic reaction zone for continuous increased temperature increase in the processing or a gradient and / or the catalyst has a metal concentration gradient.
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