초록

A process for producing a production gas mixture comprising hydrogen, by thermocatalytic decomposition of an initial mixture which comprises at least one hydrocarbon, comprising the steps of:

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[ What is claimed is:] [1.]1. A process for producing a production gas mixture comprising hydrogen, by thermocatalytic decomposition of an initial mixture which comprises at least one hydrocarbon, comprising the steps of:(i) feeding said initial mixture to a system comprising, in succession, at leas

[ What is claimed is:] [1.]1. A process for producing a production gas mixture comprising hydrogen, by thermocatalytic decomposition of an initial mixture which comprises at least one hydrocarbon, comprising the steps of:(i) feeding said initial mixture to a system comprising, in succession, at least a first reaction zone R.sub.1 and a second reaction zone R.sub.2, each of said reaction zones including a catalyst, comprising a concentration of a metal, which is capable on contact with the hydrocarbon of forming carbon nanotubes, wherein said zones R.sub.1 and R.sub.2 :are separate within at least two different consecutive reactors or consecutive within the same reactor, andare subjected to at least one of an increasing temperature gradient and an increasing metal concentration gradient in the catalyst;(ii) reacting said initial mixture in said first catalytic reaction zone R.sub.1 to form a first intermediate mixture comprising an enhanced H.sub.2 concentration compared to said initial mixture;(iii) feeding said first intermediate mixture into said second catalytic reaction zone R.sub.2 through a line connecting said first and second reaction zones;(iv) reacting said first intermediate mixture in said second catalytic reaction zone R.sub.2 to form a second intermediate mixture or a final production product;(v) optionally repeating said steps (iii) and (iv) with said second or additional intermediate mixtures in one or more additional reaction zones to obtain a final production product.