▎ 摘　　要

NOVELTY - Production of carbon nanofilaments involves feeding a reaction chamber containing carbon-sequestration catalyst particles with a continuous gaseous flow containing hydrocarbon compounds and carbon oxide through a gas inlet, inside the reaction chamber, adding at least partially the gaseous flow into a gas conduit (c1) mounted above the gas inlet and vertically spaced-apart, where the gas conduit (c1) is opened at both ends, and withdrawing gas from the reaction chamber through a gas outlet located above a bed of the catalyst particles contained in the reaction chamber, where the catalyst particles are siphoned up and fluidized by the gaseous flow and travel up to the gas conduit (c1) through a space defined between the gas conduit (c1) and the gas inlet and through an end (e1) of the gas conduit (c1), exits at the top end of the gas conduit (c1), and fall outside the gas conduit (c1) to be recirculated, during operation. USE - Production of carbon nanofilaments used for producing graphene and carbon black (all claimed). ADVANTAGE - The method provides carbon nanofilaments having increased the production rate of carbon black and/or graphene. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: a carbon sequestration reactor, which consists of a housing defining the reaction chamber with a tapered portion and containing catalyst particles, and a carbon sequestration unit located inside the reaction chamber and comprising the gas conduit (c1) mounted above the gas inlet and vertically spaced-apart. The housing comprises the gas inlet and the gas outlet. The gas inlet is opened in the tapered portion of the reaction chamber. The gas outlet is located above the bed of the catalyst particles contained in the reaction chamber; a pyrolysis system, which consists of a pyrolysis reactor (322) including a housing defining a pyrolysis reaction chamber and an oxidation chamber separated from the pyrolysis reaction chamber through a partition grid and located below the pyrolysis reaction chamber, the housing containing a carbon-based feedstock inlet opened in the pyrolysis reaction chamber, a pyrolysis product outlet opened in the pyrolysis reaction chamber, and a fuel inlet in gas communication with the oxidation chamber. The pyrolysis product outlet is in fluid communication with the fuel inlet of the pyrolysis reactor to direct at least partially a pyrolysis product into the oxidation chamber of the pyrolysis reactor; and pyrolysis process, which involves feeding the oxidation chamber of the pyrolysis reactor with the oxidizing agent and the fuel, at least partially oxidating the fuel in the oxidation chamber of the pyrolysis reactor to supply heat to a pyrolysis reaction chamber of the pyrolysis reactor, feeding the pyrolysis reaction chamber of the pyrolysis reactor with a carbon-based feedstock to pyrolyze the carbon-based feedstock using heat generated by the at least partial oxidation of the fuel, withdrawing the pyrolysis product from the pyrolysis reaction chamber of the pyrolysis reactor, and recirculating at least a portion of the pyrolysis product as fuel fed to the oxidation chamber. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of converting carbon-based feedstock. 310Graphene and carbon black synthesis system 312Plasma reactor 322Pyrolysis reactor 367Gaseous fraction 370Carbon sequestration reactor