A method of processing a reaction product generated from a plasma-based reactive process includes: supplying a first electromagnetic energy to a flowing primary gaseous feed material, such that at least a fraction of the flowing primary gaseous feed material is excited by the supplied first electromagnetic energy into a first plasma within a first plasma zone, and such that at least a fraction of the flowing primary gaseous feed material is converted to a first plasma zone-conditioned product while flowing through the first plasma and the first plasma zone-conditioned product is flowed to a downstream reaction zone. A second gaseous material is then introduced to the downstream reaction zone. The first plasma zone-conditioned product is contacted with the second gaseous material within the downstream reaction zone.