Abstract: The present disclosure provides systems and methods for making carbon particles. The systems of the present disclosure may include a reactor for pyrolysis of hydrocarbon feedstock to carbon particles. The methods of the present disclosure may include contacting, in a reactor, a non-hydrogenous gas with a hydrocarbon feedstock in presence of a plasma to generate carbon particles and an effluent gas. The effluent gas may comprise hydrogen and the non-hydrogen gas. The method may further include separating at least a portion of the effluent gas into the hydrogen and non-hydrogen gas to obtain a separated gas comprising the non-hydrogenous gas. The separated gas comprising the non-hydrogenous gas may be recycled or otherwise returned to the reactor to generate additional carbon particles and effluent gas.

Abstract: The present disclosure provides methods and systems for improving a yield of carbon particles from a carbon particle generating rector. The methods and systems may comprise use of a silicon-containing additive in the carbon particle generating process.