TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Device: Alternatively, plasma reactor for treating feedstocks at high temperature, comprises: (a) a substantially cylindrical outer shell having proximal and distal ends and configured to be positionable in-line to a tubular exhaust manifold, with the proximal end of the shell configured to be adjacent to and to receive the high temperature feedstock incoming from the tubular exhaust manifold; (b) a cupped first electrode having a open distal end facing away from the exhaust manifold, the first electrode positioned at or near the proximal end of the outer shell; (c) a substantially cylindrical second electrode having proximal and distal ends, the proximal end of the second electrode positioned adjacent to but separated from the distal end of the first electrode by a gap, the electrodes and gap configured to be capable of generating and maintaining a gliding arc plasma discharge within a plasma zone in the reactor upon application of an electric potential difference between the first and second electrodes; (d) first electrode being physically attached to the proximal end of the outer shell by a first solid flange, the flange providing electrical communication between the first electrode and the outer shell and having channels passing through, the channels configured to direct the high temperature feedstock incoming from the exhaust manifold tangentially into the plasma zone; (e) distal end of the second electrode physically attached the distal end of the outer shell by a second solid flange, the second flange comprising an electrical insulator capable of electrically isolating the second electrode from the outer shell; and (f) the outer shell, the second electrode, and the first and second flanges defining a substantially cylindrical annulus. Flow-through plasma reactor for treating high temperature feedstocks, comprises: (a) a reactor conduit through which a high temperature feedstock passes; and(b) at least two non-thermal plasma reactors, each reactor comprising at least one inlet circumferential gas flow inlet apparatus, an electrode, and a flow restricted exit portal, the non-thermal plasma reactors configured to eject a jet of non-thermal plasma, when energized, into the conduit so as to contact the high temperature feedstock with sufficient energy to remove heavy hydrocarbons and particulates from the passing high temperature feedstock. Preferred Conditions: The high temperature feed gas has incoming temperatures at 600-900 degrees C, the reactor comprises materials of construction in a configuration capable of sustained contact between the reactor and the feedgas for at least 1000 consecutive hours. Cooling is sufficient to maintain the surface temperature of the insulator to not less than 500 degrees F (about 260 degrees C).    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The electric insulator comprises a perfluoropolymer, preferably polytetrafluoroethylene (PTFE); including glass filled PTFE. The feedstock further comprises hydrogen, carbon monoxide, carbon dioxide, steam, light and heavy hydrocarbons, tar, air, oxygen, nitrogen, or its combination.