Method and system for pyrolysis and carbon deposition

The present invention provides a process for successive pyrolysis and carbon deposition to produce a composite carbonaceous product, the process comprising: a pyrolysis process step comprising pyrolyzing a pyrolyzable organic feed in a first reaction zone at a pyrolysis temperature in the presence of a non-oxidizing gas to produce hot char and a pyrolysis gas, wherein the pyrolysis gas and the non-oxidizing gas combine to form a gas mixture; discharging the gas mixture from the first reaction zone to a combustion zone and combusting at least a portion of the pyrolysis gas in the combustion zone wherein heat generated by combustion of the pyrolysis gas is transferred from the combustion zone to the first reaction zone to provide at least a portion of pyrolytic heat; and a decomposition process step comprising, after generating a hot char in the pyrolysis process step, directly contacting a hydrocarbon-rich organic gas with the hot char wherein the hydrocarbon-rich organic gas is catalytically decomposed on the