TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The method further comprises introducing an external combustion of a portion of the stream of HCG into the environment where there is an external activation of the carbon particulates; and combustion of recovered carbon from the thermocatalytic decomposition process, where the temperature of the decomposition is increased for sustainable production of hydrogen. The carbon is withdrawn from the reactor, a portion is directed to a grinder and a heater, where heating and activation of the carbon catalyst occurs. The carbon catalyst is internally activated by recycling the hydrogen depleted stream containing unsaturated and aromatic hydrocarbons to the reactor. It is externally activated by surface gasification of the carbon with hot flue gases arising from combustion of a hydrocarbon feedstock. The additional external activation of carbon catalyst occurs by partial oxidation of aromatic hydrocarbons as byproducts of the process producing carbon black particles which adhere to a surface portion of the carbon catalyst.Preferred Condition: The temperature of the thermocatalytic reactor is 800-1000degreesC. The reactor has a transit time of 1-60 seconds, and a pressure of 1-25 atmospheres.Preferred Component: The moving bed reactor is a fluidized bed reactor.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The hydrocarbon is a natural gas feedstock from natural gas and/or crude oil, and contains sulfur.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The carbon-based catalyst is carbon black. EXAMPLE - Dry activated carbon (0.30 g) was placed in a microreactor (5.0 ml). The reactor was maintained at a constant temperature of 850degreesC and atmospheric pressure. The reactor was purged with an inert gas at 850degreesC for 30 minutes before introduction of methane. Methane entered the catalytic reactor at a constant flow rate of 5.0 ml/min. The flow rate of the effluent gas after the reactor was measured with an accuracy of 5%. Methane decomposition rates (MDR) were determined from methane concentrations in the influent and effluent gases. The initial MDR was equal to 2.04 mmole/min x g. MDRs were measured every 6-8 minutes until the end of the experiment. The methane conversion rate after 1 hour was equal to 0.65 mmole/min x g, which corresponds to 3.1 fold decrease. No traces of carbon monoxide and carbon dioxide were detected in the effluent gas.